Sales: 029 2009 9898 | Customer Service: 029 2009 8087
Boilerhut
  • Services
    • Boiler Installation by Fuel Source
      • Gas Boilers
      • Oil Boilers
      • LPG Boilers
    • Boiler Installation by Type
      • Combi Boilers
      • Conventional Boilers
      • System Boilers
      • Back Boiler Replacement
    • Central Heating Installation
    • Heating Control Fitting
      • EPH Heating Controls
      • Nest Thermostats
      • tado° Smart Thermostat Installation
    • Radiator Fitting
    • Heating System Flushing
  • Boiler Ranges
    • Alpha Boilers
    • Ariston Boilers
      • Ariston Alteas ONE Net Gas Combi Boiler Review
      • Ariston Clas ONE Gas Combi Boiler Review
      • Ariston Clas System ONE Gas System Boiler Review
      • Ariston E-Combi ONE Combi Boiler Review
      • Ariston E-System ONE Gas System Boiler Review
      • Ariston Genus ONE Net Gas Combi Boiler Review
    • Baxi Boilers
      • Baxi 200 Combi Boiler Review
      • Baxi 400 Boiler Review
      • Baxi 600 Boiler Review
      • Baxi 636 Combi LPG Boiler Review
      • Baxi 800 Boiler Review
      • Baxi Duo-tec Combi Boiler Review
      • Baxi Megaflo System Boiler Review
      • Baxi Platinum Combi Review
      • Baxi Platinum+ 40kW Combi Boiler Review
      • Baxi Platinum+ System Boiler Review
    • Glow-worm
      • Glow-worm Betacom₄ Combi Boiler Review
      • Glow-worm Easicom₃ Boiler Review
      • Glow-worm Essential Combi Boiler Review
      • Glow-worm Ultimate₃ Boiler Review
    • Grant Boilers
      • Grant Vortex Blue Oil Boiler Review
      • Grant Vortex Eco Oil Boiler Review
      • Grant Vortex Pro Oil Boiler Review
    • Ideal Heating
      • Ideal Logic+ Boiler Review
      • Ideal Logic Max Boiler Review
      • Ideal Mexico HE Gas Boiler Review
      • Ideal Vogue Gen2 Boiler Review
      • Ideal Vogue Max Boiler Review
    • Intergas Boilers
    • Navien Boilers
      • Navien Condensing NCB Gas Combi Boiler Review
      • Navien LCB700 Blue Flame Oil Boiler Review
      • Navien Hybrigen SE Boiler Review
      • Navien Premium Condensing NPE Gas Water Heater Review
    • Vaillant Boilers
      • Vaillant ecoTEC Pro Combi Boiler Review
      • Vaillant ecoTEC plus Combination Store Boiler Review
      • Vaillant ecoTEC plus Boiler Review
      • Vaillant ecoTEC exclusive with Green iQ Review
      • Vaillant ecoFIT pure Boiler Review
    • Viessmann Boilers
      • Viessmann Vitodens 050-W Combi Boiler Review
      • Viessmann Vitodens 100-W Boiler Review
      • Viessmann Vitodens 111-W Storage Combi Boiler Review
      • Viessmann Vitodens 200-W Gas Boiler Review
    • Warmflow Boilers
    • Worcester Bosch Boilers
      • Worcester Bosch Greenstar i Gas Boiler Review
      • Worcester Bosch Greenstar 8000 Gas Boiler Review
      • Worcester Bosch Greenstar Si Compact Gas Boiler Review
      • Worcester Bosch GB162 Gas Boiler Review
      • Worcester Bosch Greenstar 2000 Gas Boiler Review
      • Worcester Bosch Greenstar 8000 Life Gas Boiler Review
      • Worcester Bosch Greenstar 8000 Style Boiler Review
      • Worcester Bosch Greenstar CDi Compact Gas Boiler Review
      • Worcester Bosch Greenstar CDi Highflow Gas Boiler Review
      • Worcester Bosch Greenstar Heatslave II Oil Boiler Review
      • Worcester Bosch Greenstar Danesmoor Oil Boiler Review
  • Boiler Guides
    • FAQs
    • How Much is a New Boiler?
    • Our Boilers Explained
      • Condensing Combi Boiler
    • What is the Best Boiler 2022?
    • Hydrogen Boiler explained
    • What is the Best Combi Boiler 2022?
    • What is the Best Oil Boiler 2022?
    • What is the Best Condensing Boiler 2022?
    • What is the Best System Boiler 2022?
    • Worcester Bosch vs Viessmann
    • Baxi vs Viessmann
    • Baxi vs Worcester Bosch
    • Worcester Bosch vs Vaillant
    • What is a Condensate Pipe?
    • What is a Boiler Filling Loop?
    • Changing to a Combi Boiler
  • Boiler Finance
  • About Us
    • Testimonials
    • Case Studies
      • Back Boiler Replacement St Albans
      • Full Central Heating Installation Cardiff
      • Navien Oil Boilers Install – Dewsall Court, Hereford
      • Worcester Bosch Greenstar Heatslave II Oil Boiler Installation, Vale of Glamorgan
  • Contact Us
  • Menu Menu
Get an online boiler quote
Need a new boiler?
Get FREE no-obligation quotes now!
  • No delays! Get quotes today
  • Compare quotes & get the best prices
  • Gas Safe registered engineers
Get Your FREE Online Quote Today
Don't worry it only takes a minute

Viessmann Boiler Fault Codes

Viessmann

In the unfortunate event that your Viessmann boiler develops an issue, it will display a fault code. So that you can quickly identify what the fault code means and what should be your next course of action, we have developed the below fault code finders for the Viessmann range. Just search for the fault code that your boiler is displaying and the fault code finder will provide you with a diagnosis, this will assist you should you need to contact an engineer.

Viessmann Vitodens 050-W Fault Codes

Viessmann Vitodens 100-W Fault Codes

Viessmann Vitodens 111-W Fault Codes

Viessmann Vitodens 200-W Fault Codes

Viessmann Vitodens 222-F Fault Codes

Viessmann Vitodens 050-W Fault Codes

Displayed
fault code
System characteristicsCauseMeasures
10Constant modeShort circuit, outside temperature sensorCheck the outside temperature sensor and lead.
18Constant modeLead break, outside temperature sensorCheck the outside temperature sensor and lead.
30Burner blockedShort circuit, boiler water temperature sensorCheck boiler water temperature sensor.
38Burner blockedLead break, boiler water temperature
sensor
Check boiler water temperature sensor.
51No DHW heatingShort circuit, outlet temperature sensorCheck sensor.
52Burner blockedShort circuit, flow sensorCheck connections and lead; replace sensor if required.
59No DHW heatingLead break, outlet temperature sensorCheck sensor.
5ABurner blockedLead break, flow sensorCheck connections and lead; replace sensor if required.
A9Control mode without OpenTherm influenceCommunication error, OpenTherm deviceCheck connections and lead; replace OpenTherm if required.
b0Burner blockedShort circuit, flue gas temperature sensorCheck sensor.
b8Burner blockedLead break, flue gas temperature sensorCheck sensor.
E3Burner in a fault stateFault in safety chainCheck the temperature limiter and connecting cables.
E5Burner blockedInternal faultCheck the ionisation electrode and connecting cables.
F0Burner blockedInternal faultReplace control unit.
F1Burner in a fault stateMax. flue gas temperature exceededCheck heating system fill level. Check circulation pump. Vent the system.
F2Burner in a fault stateTemperature limiter has respondedCheck heating system fill level. Check circulation pump. Vent the system. Check the temperature limiter and connecting cables .
Press "Reset"
F3Burner in a fault stateFlame signal is al ready present at burner startCheck ionisation electrode and connecting cable.
Press "Reset"
F4Burner in a fault stateNo flame signal detectedCheck the ignition/ionisation electrode and connecting cables, check the gas pressure, check the gas train, ignition, ignition module and condensate drain. Press "Reset"
F8Burner in a fault stateFuel valve closes too lateCheck gas train. Check both control paths. Press "Reset"
F9Burner in a fault stateFan speed too low during burner startCheck fan, fan connecting cables and power supply; check fan control. Press "Reset"
FABurner in a fault stateFan idle state not reachedCheck fan, fan connecting cables and power supply; check fan control. Press "Reset"
FCBurner blockedElectrical fan control (control unit) faultyCheck fan connecting cable; replace if required, or replace control unit.
FdBurner blockedFault, burner control unit sensorCheck ignition electrodes and connecting cables. Check whether a strong interference (EMC) field exists near the appliance. Press "Reset" . Replace control unit if fault persists.
FFBurner blockedFault, burner control unit sensorCheck ignition electrodes and connecting cables. Check whether a strong interference (EMC) field exists near the appliance. Press "Reset" . Replace control unit if fault persists.
–––Burner blockedCommunication error between burner control unit and programming unitCheck connecting cable. Press "Reset". Replace burner control unit or programming unit if
the fault persists

Viessmann Vitodens 100-W Fault Codes

Displayed
fault code
System characteristicsCauseMeasures
10Constant modeShort circuit, outside temperature
sensor
Check the outside temperature sensor and lead.
18Constant modeLead break, outside temperature
sensor
Check the outside temperature sensor and lead.
30Burner blockedShort circuit, boiler water temperature
sensor
Check boiler water temperature sensor.
38Burner blockedLead break, boiler water temperature
sensor
Check boiler water temperature sensor.
51No DHW heatingShort circuit, outlet temperature sensorCheck sensor.
52Burner blockedShort circuit, flow sensorCheck connections and lead; replace sensor if required.
59No DHW heatingLead break, outlet temperature sensorCheck sensor.
5ABurner blockedLead break, flow sensorCheck connections and lead; replace sensor if required.
A9Control mode without OpenTherm influenceCommunication error, OpenTherm
device
Check connections and lead; replace OpenTherm
if required.
b0Burner blockedShort circuit, flue gas temperature
sensor
Check sensor .
b8Burner blockedLead break, flue gas temperature
sensor
Check sensor.
E3Burner in a fault stateFault in safety chainCheck the temperature limiter and connecting cables.
E5Burner blockedInternal faultCheck the ionisation electrode and connecting cables.
F0Burner blockedInternal faultReplace control unit.
F1Burner in a fault stateMax. flue gas temperature exceededCheck heating system fill level. Check circulation
pump. Vent the system.
F2Burner in a fault stateTemperature limiter has respondedCheck heating system fill level. Check circulation pump. Vent the system. Check the temperature limiter and connecting cables.
Press "Reset".
F3Burner in a fault stateFlame signal is al ready present at
burner start sensor
Check ionisation electrode and connecting cable.
Press "Reset" burner start.
F4Burner in a fault stateNo flame signal detected
Check the ignition/ionisation electrode and connecting cables, check the gas pressure, check the
gas train, ignition, ignition module and condensate
drain. Press "Reset .
F8Burner in a fault stateFuel valve closes too lateCheck gas train. Check both control paths. Press "Reset.
F9Burner in a fault stateFan speed too low during burner startCheck fan, fan connecting cables and power supply;
check fan control. Press "Reset.
FABurner in a fault stateFan idle state not reached
Check fan, fan connecting cables and power supply;
check fan control. Press "Reset.
FCBurner blockedElectrical fan control (control unit)
faulty
Check fan, fan connecting cables and power supply;
check fan control. Press "Reset.
FdBurner blockedFault, burner control unit sensorCheck ignition electrodes and connecting cables.
Check whether a strong interference (EMC) field
exists near the appliance. Press "Reset".
Replace control unit if fault persists
FFBurner blockedFault, burner control unit sensorCheck ignition electrodes and connecting cables.
Check whether a strong interference (EMC) field
exists near the appliance. Press "Reset".
Replace control unit if fault persists
–––Burner blockedCommunication error between burner control unit and programming unitCheck connecting cable. Press "Reset. Replace burner control unit or programming unit if the fault persists.

Viessmann Vitodens 111-W Fault Codes

Fault code displayedSystem characteristicsCauseMeasures
0ABurner blockedCO limiter (if installed) has responded. CO concentration too high.Check the heating system. Remove the cause of escaping CO.
0ABurner blockedGas pressure switch (if installed) has responded.
Gas pressure too low.
Check the gas supply.
0CBurner blockedMains voltage too lowCheck the power supply.
10Continuous operationShort circuit, outside temperature sensorCheck the outside temperature sensor and lead .
18Continuous operationLead break, outside temperature sensorCheck the outside temperature sensor and lead .
30Burner blockedShort circuit, boiler water temperature sensorCheck boiler water temperature sensor.
38Burner blockedLead break, boiler water temperature sensorCheck boiler water temperature sensor.
50No DHW heatingShort circuit, cylinder temperature sensorCheck sensor.
51No DHW heatingShort circuit, cylinder outlet sensorCheck sensor.
58No DHW heatingLead break, cylinder temperature sensorCheck sensor.
59No DHW heatingLead break, outlet temperature sensorCheck sensor.
A3Burner blocked.Flue gas temperature sensor incorrectly positioned.Fit flue gas temperature sensor correctly.
A9Control mode without OpenTherm deviceCommunication error, OpenTherm deviceCheck connections and lead; replace OpenTherm device if required.
b0Burner blockedShort circuit, flue gas temperature sensorCheck sensor.
b7Emergency modeBurner control unit faultTurn the ON/OFF switch OFF and ON again.
b8Burner blockedLead break, flue gas temperature sensorCheck sensor.
E3Burner in a fault stateFault in safety chainCheck the temperature limiter and connecting cables. Check the control unit, and replace if required.
E5Burner blockedInternal faultCheck the ionisation electrode and connecting cables.
Press reset.
F0Burner blockedInternal faultReplace control unit.
F1Burner in a fault stateMax. flue gas temperature exceededCheck heating system fill level. Check circulation pump. Vent the system.
Press reset.
F2Burner in a fault stateTemperature limiter has respondedCheck heating system fill level. Check circulation pump. Vent the system. Check the temperature limiter and connecting cables. Press reset .
F3Burner in a fault stateFlame signal is already present at burner startCheck ionisation electrode and connecting cable.
Press reset .
F4Burner in a fault stateNo flame signal detectedCheck the ignition/ionisation electrode and connecting cable, the gas pressure, the gas train, ignition and condensate drain.
Press reset .
F8Burner in a fault stateFuel valve closes too lateCheck gas train. Check both control paths.
Press reset .
F9Burner in a fault stateFan speed too low during burner startCheck fan, fan connecting cables and power supply to fan; check fan control.
Press reset.
FABurner in a fault stateFan idle state not reachedCheck fan, fan connecting cables and fan control.
Press reset.
FCBurner blockedElectrical fan control (control unit) faultyCheck fan connecting cable; replace if required, or replace control unit.
FdBurner blockedBurner control unit faultCheck ignition electrodes and connecting cables. Check whether a strong interference (EMC) field exists near the appliance.
Press reset . Replace control unit if fault persists.
FFBurner blockedBurner control unit faultCheck ignition electrodes and connecting cables. Check whether a strong interference (EMC) field exists near the appliance.
Press reset . Replace control unit if fault persists.

Viessmann Vitodens 200-W Fault Codes

Fault code displayedSystem characteristicsCauseMeasures
10Regulates as if the outside temperature were 0 °C.Short circuit, outside temperature sensorCheck outside temperature sensor.
18Regulates as if the outside temperature were 0 °C.Lead break, outside temperature sensorCheck outside temperature sensor.
19Regulates as if the outside temperature were 0 °C.Communication interruption, outside temperature sensor RFCheck wireless connection. Place outside temperature sensor RF close to the boiler.
Forget outside temperature sensor, then pair again .Replace outside temperature sensor RF.
20Regulates without flow temperature sensor (low loss header).Short circuit, system flow temperature sensorCheck low loss header sensor .
21Control mode
Display fault in energy cockpit
Sensor outside tolerance rangeCheck sensors on DHW cylinder and collectors.
22Control mode
Display fault in energy cockpit
Sensor outside tolerance rangeCheck sensors on DHW cylinder and collectors.
23Control mode
Display fault in energy cockpit
Incorrect commissioningDetermine solar circuit flow rate and enter value established.
24Control mode
Display fault in energy cockpit
DHW circulation pump shut downCheck setting of parameter 39 ("General" group). If required, carry out an actuator test.
25Control mode
Display fault in energy cockpit
Transfer pump not workingCheck setting of parameter 20 ("Solar" group). If required, carry out an actuator test.
26Control mode
Display fault in energy cockpit
DHW circulation pump and transfer pump not workingCheck settings of parameter 39 ("General" group) and parameter 20 ("Solar" group). If required, carry out an actuator test.
27Control mode
Display fault in energy cockpit
Incorrect commissioningDetermine solar circuit flow rate and enter value established.
28Regulates without flow temperature sensor (low loss header).Lead break, system flow temperature sensorCheck low loss header sensor
If no low loss header sensor is connected, set parameter 52:0.
2AControl mode
Display fault in energy cockpit
Solar circuit flow and return interchanged.Check solar circuit flow and return and swap over if required.
30Burner blockedShort circuit, boiler water temperature sensorCheck boiler water temperature sensor .
38Burner blockedLead break, boiler water temperature sensorCheck boiler water temperature sensor.
40Mixer closes.Short circuit, flow temperature sensor, heating circuit 2 (with mixer)Check flow temperature sensor.
44Mixer closes.Short circuit, flow temperature sensor, heating circuit 3 (with mixer)Check flow temperature sensor.
48Mixer closes.Lead break, flow temperature sensor, heating circuit 2 (with mixer)Check flow temperature sensor.
49Mixer closes.Incorrect assignment of extension for mixer, heating circuit 2Check and adjust rotary selector S1.
4CMixer closes.Lead break, flow temperature sensor, heating circuit 3 (with mixer)Check flow temperature sensor .
4DMixer closes.Incorrect assignment of extension for mixer, heating circuit 3Check and adjust rotary selector S1.
50No DHW heating by the boilerShort circuit, cylinder temperature sensor or comfort sensorCheck cylinder temperature sensor or comfort sensor.
51No DHW heating by the boilerShort circuit, outlet temperature sensorCheck outlet temperature sensor.
58No DHW heating by the boilerLead break, cylinder temperature sensor or comfort sensorCheck cylinder temperature sensor or comfort sensor .
59No DHW heating by the boilerLead break, outlet temperature sensorCheck outlet temperature sensor.
90Control modeShort circuit, temperature sensor Check sensor on solar control module.
91Control modeShort circuit, temperature sensorCheck sensor on solar control module.
92No solar DHW heatingShort circuit, collector temperature sensorCheck temperature sensor on solar control module or sensor on the Vitosolic.
93Control modeShort circuit, collector return temperature sensorCheck temperature sensor at terminal S3 on the Vitosolic 100.
94No solar DHW heatingShort circuit, cylinder temperature sensorCheck temperature sensor on solar control module or sensor on the Vitosolic.
95Burner blockedCO limit exceeded Danger
An increased concentration of carbon monoxide can cause potentially fatal car- bon monoxide poisoning. Observe the safety instructions at the beginning of this manual.
Determine the cause of the increased CO level. Remedy the fault.
Press Test on the CO limiter. The alarm is switched off.
The burner starts again once the CO level is below the CO limit.
96Burner blockedCO limiter sensor faultReplace the CO limiter.
If the system is to be temporarily operated without CO limiter, set parameter 49:0.
98Control modeLead break, temperature sensor Check sensor on solar control module.
99Control modeLead break, temperature sensorCheck sensor on solar control module.
9ANo solar DHW heatingLead break, collector temperature sensorCheck temperature sensor on solar control module or sensor on the Vitosolic.
9BControl modeLead break, collector return temperature sensorCheck temperature sensor at terminal S3 on the Vitosolic 100.
9CNo solar DHW heatingLead break, cylinder temperature sensorCheck temperature sensor on solar control module or sensor on the Vitosolic.
9EControl modeNo flow rate in solar circuit or flow rate too low, or temperature limiter has responded.Check solar circuit pump and solar circuit. Acknowledge fault message.
9FControl modeSolar control module or Vitosolic faultReplace solar control module or Vitosolic.
A3Burner blockedFlue gas temperature sensor incorrectly positionedFit flue gas temperature sensor correctly.
A7Control mode as per delivered conditionProgramming unit faultyReplace the programming unit.
A8Burner blocked. The venting program is started automatically.Air in the internal circulation pump or minimum flow rate not achievedVent the system if the fault message persists.
A9If a heating circuit with mixer is connected, the burner operates at its lower heating output.
If only one heating circuit without mixer is connected, the burner is blocked.
Internal circulation pump blockedCheck circulation pump.
B0Burner blockedShort circuit, flue gas temperature sensorCheck flue gas temperature sensor.
B1Control mode as per delivered conditionCommunication error, programming unitCheck connections; replace programming unit if necessary.
B5Control mode as per delivered conditionInternal faultReplace control unit.
B7Burner blockedBoiler coding card faultPlug in boiler coding card or replace if faulty.
B8Burner blockedLead break, flue gas temperature sensorCheck flue gas temperature sensor.
BAMixer regulates to 20 °C flow temperature.Communication error, extension kit for heating circuit 2 (with mixer)Check extension kit connections and assignment.
BBMixer regulates to 20 °C flow temperature.Communication error, extension kit for heating circuit 3 (with mixer)Check extension kit connections and assignment.
BCControl mode without remote controlCommunication error, Vitotrol remote control, heating circuit 1 (without mixer)Check connections, cable, parameter "A0" in the "Heating circuit" group and remote control settings .
For wireless remote controls: check connection, place remote control close to the boiler.
BDControl mode without remote controlCommunication error, Vitotrol remote control, heating circuit 2 (with mixer)Check connections, cable, parameter "A0" in the "Heating circuit" group and remote control settings .
For wireless remote controls: check connection, place remote control close to the boiler.
BEControl mode without remote controlCommunication error, Vitotrol remote control, heating circuit 3 (with mixer)Check connections, cable, parameter "A0" in the "Heating circuit" group and remote control settings .
For wireless remote controls: check connection, place remote control close to the boiler.
BFControl modeIncorrect LON communication moduleReplace LON communication module.
C1Control modeCommunication error, EA1 extensionCheck connections.
C2Control modeCommunication error, solar control module or VitosolicCheck solar control module or Vitosolic.
C3Control modeCommunication error, AM1 extensionCheck connections.
C4Control modeCommunication error, OpenTherm extensionCheck OpenTherm extension.
C5Control mode, max. pump speedCommunication error, internal variable speed pumpCheck setting of parameter "30" in
"Boiler" group.
CDControl modeCommunication error, Vitocom 100 (KM-BUS)Check connections, Vitocom 100 and parameter "95" in "General" group.
CFControl modeCommunication error, communication moduleReplace communication module.
D3Burner in a fault state or blocked.Communication error, fan unitCheck the connecting cable to the fan unit.
Press reset button R.
If the fault recurs, replace the fan unit.
D4Control mode
Burner is operating with a limited modulation range.
No air flow detected in fan unit.Check the mass flow sensor at the fan unit. Check the flue system for flue gas back pressure.
D5Burner in a fault state.Fan blockedPress reset button R.
Check free movement of the impeller. Replace the fan unit if required.
D6Control modeInput DE1 at EA1 extension reports a fault.Remedy fault at appliance concerned.
D7Control modeInput DE2 at EA1 extension reports a fault.Remedy fault at appliance concerned.
D8Control modeInput DE3 at EA1 extension reports a fault.Remedy fault at appliance concerned.
DAControl mode without room influenceShort circuit, room temperature sensor, heating circuit 1 (without mixer)Check room temperature sensor, heating circuit 1.
External room temperature sensor for Vitotrol 300 or integrated sensor for Vitotrol 200/300
DBControl mode without room influenceShort circuit, room temperature sensor, heating circuit 2 (with mixer)Check room temperature sensor, heating circuit 2.
External room temperature sensor for Vitotrol 300 or integrated sensor for Vitotrol 200/300
DCControl mode without room influenceShort circuit, room temperature sensor, heating circuit 3 (with mixer)Check room temperature sensor, heating circuit 3.
External room temperature sensor for Vitotrol 300 or integrated sensor for Vitotrol 200/300
DDControl mode without room influenceLead break, room temperature sensor, heating circuit 1 (without mixer)Check room temperature sensor, heating circuit 1 and remote control settings .
External room temperature sensor for Vitotrol 300 or integrated sensor for Vitotrol 200/300
DEControl mode without room influenceLead break, room temperature sensor, heating circuit 2 (with mixer)Check room temperature sensor, heating circuit 2 and remote control settings.
External room temperature sensor for Vitotrol 300 or integrated sensor for Vitotrol 200/300
DFControl mode without room influenceLead break, room temperature sensor, heating circuit 3 (with mixer)Check room temperature sensor, heating circuit 3 and remote control settings ).
External room temperature sensor for Vitotrol 300 or integrated sensor for Vitotrol 200/300
E0Control modeExternal LON subscriber errorCheck connections and LON subscribers.
E2Burner in a fault stateNo calibration as flow rate too lowEnsure adequate heat transfer. Press reset button R.
E3Burner in a fault stateHeat transfer too low during calibration Temperature limiter has shut down.Ensure adequate heat transfer. Press reset button R.
E4Burner blocked24 V power supply faultReplace control unit.
E5Burner blockedFlame amplifier faultReplace control unit.
E8Burner in a fault stateIonisation current lies out- side the permissible rangeCheck gas supply (gas pressure and gas flow switch), gas train and connecting cable.
Check assignment of gas type.
Check ionisation electrode:
■ Distance to burner gauze assembly (see page 42)
■ Electrode soiled
Press reset button R.
EBBurner in a fault stateRepeated flame loss or deactivation during calibration1. Check system for excessive temperature. If fault F1 or F2 is present, ensure there is adequate heat transfer.
Press reset button R.
2. Check system for condensate backup.
Note
To prevent water damage, detach fan unit before removing the burner.
Remove the condensate back- up.
Press reset button R.
3. Check ionisation electrode for contamination.
Check gap between ionisation electrode and burner gauze assembly (see page 42).
Press reset button R.
4. Check flue system; remove flue gas recirculation if required. Press reset button R.
ECBurner in a fault stateParameter error during calibrationPress reset button R. or
Replace boiler coding card and press reset button R.
EDBurner in a fault stateInternal faultReplace control unit.
EEBurner in a fault stateFlame signal at burner start not present or insufficient.■ Check gas supply (gas pressure and gas flow switch).
■ Check gas train.
■ Check system for condensate backup.
Note
To prevent water damage, detach fan unit before removing the burner.
■ Check ionisation electrode and connecting cable.
Check ignition:
■ Connecting cables to ignition module and ignition electrode
■ Ignition electrode gap and soiling (see page 42).
Press reset button R.
EFBurner in a fault stateFlame is lost immediately after it has built (during safety time).Check gas supply (gas pressure and gas flow switch).
Check balanced flue system for flue gas recirculation.
Check ionisation electrode (replace if required):
■ Distance to burner gauze assembly (see page 42)
■ Electrode soiled
Press reset button R.
F0Burner blockedInternal faultReplace control unit.
F1Burner in a fault stateFlue gas temperature limiter has responded.Check heating system fill level. Vent the system.
When the flue system has cooled down, press reset button R.
F2Burner in a fault stateTemperature limiter has responded.Check heating system fill level. Check circulation pump. Vent the system. Check temperature limiter and connecting cables.
Press reset button R.
F3Burner in a fault stateFlame signal is already present at burner start.Check ionisation electrode and connecting cable.
Check system for condensate backup.
Note
To prevent water damage, detach fan unit before removing the burner.
Press reset button R.
F8Burner in a fault stateFuel valve or modulation valve will not close.Check the gas train and replace if required.
Press reset button R.
F9Burner in a fault stateFan speed too lowCheck fan, fan connecting cables and fan power supply.
Press reset button R.
FABurner in a fault stateFan idle state or set speed not reachedCheck fan, check connecting cables to fan.
Press reset button R.
FCBurner in a fault stateFan unit faulty.Check fan unit, replace if required. Press reset button R.
FdBurner in a fault state and additional fault B7 is displayed.Boiler coding card missing.Insert the boiler coding card. Press reset button R.
Replace control unit if fault persists.
FdBurner in a fault stateBurner control unit faultCheck ignition electrode, ionisation electrode and connecting cables. Check whether a strong interference (EMC) field exists near the appliance.
Press reset button R.
If the fault occurs sporadically, replace the coding card.
Replace control unit if fault is permanent.
FEBurner blocked or in a fault stateBoiler coding card or main PCB faulty, or incorrect boiler coding cardPress reset button R. If the fault persists, check the boiler coding card and replace boiler coding card or control unit if necessary.
FFBurner blocked or in a fault stateInternal fault or reset button R blocked.Restart the appliance. Replace the control unit if the appliance will not restart.

Viessmann Vitodens 222-F Fault Codes

Displayed fault
code
Const.Weath.- comp.System characteristicsCauseMeasures
10XXRegulates as if the outside temperature
were 0 °C
Short circuit, outside temperature sensorCheck the outside temperature sensor.
18XXRegulates as if the outside temperature
were 0 °C
Lead break, outside temperature sensorCheck the outside temperature sensor.
20XXRegulates without flow temperature sensor (low loss header)Short circuit, system flow temperature sensorCheck the low loss header sensor.
28XXRegulates without flow temperature sensor (low loss
header)
Lead break, system flow temperature sensorCheck the low loss header sensor.
30XXBurner blockedShort circuit, boiler water temperature
sensor
Check the boiler water temperature sensor .
38XXBurner blockedLead break, boiler water temperature
sensor
Check the boiler water temperature sensor .
40XMixer closesShort circuit, flow temperature sensor, heating circuit
2 (with mixer)
Check flow temperature sensor
44XMixer closesShort circuit, flow temperature sensor, heating circuit
3 (with mixer)
Check flow temperature sensor
48XMixer closesLead break, flow temperature sensor, heating circuit
2 (with mixer)
Check flow temperature sensor
4CXMixer closesLead break, flow temperature sensor, heating circuit
3 (with mixer)
Check flow temperature sensor
50XXNo DHW heatingShort circuit, cylinder temperature sensorCheck sensors
51XXNo DHW heatingShort circuit, outlet temperature sensorCheck sensors
58XXNo DHW heatingLead break, cylinder temperature sensorCheck sensors
59XXNo DHW heatingLead break, outlet temperature sensorCheck sensors
A7XControl mode as per delivered conditionProgramming unit faultyReplace programming unit
A9XThe burner operates at its lower output if a heating circuit with mixer is connected.
The burner is blocked if only one heating circuit without mixer is connected.
Internal circulation pump blockedCheck the circulation pump
b0XXBurner blockedShort circuit, flue gas temperature sensorCheck the flue gas temperature sensor
b1XXControl mode as per delivered conditionCommunication error, programming
unit
Check connections and replace the programming unit if
required
b5XXControl mode as per delivered conditionInternal faultReplace the control unit
b7XXBurner blockedBoiler coding card faultyPlug in boiler coding card or replace, if faulty
b8XXBurner blockedLead break, flue gas temperature sensorCheck the flue gas temperature sensor
bAXMixer regulates to a flow temperature
of 20 °C
Communication error, extension kit for heating circuit 2 (with mixer)Check extension kit connections and code
bbXMixer regulates to a flow temperature
of 20 °C
Communication error, extension kit for heating circuit 3 (with
mixer)
Check extension kit connections and code
bCXControl mode without remote controlCommunication error, remote control Vitotrol heating circuit 1 (without
mixer)
Check connections, lead, coding address "A0" and remote control settings
bdXControl mode without remote controlCommunication error, remote control Vitotrol heating circuit
2 (with mixer)
Check connections, lead, coding address "A0" and remote control settings
bEXControl mode without remote controlCommunication error, remote control Vitotrol heating circuit
3 (with mixer)
Check connections, lead, coding address "A0" and remote control settings
bFXControl modeIncorrect LON communication moduleReplace the LON communication module
C1XXControl modeCommunication error extension EA1Check electrical connections
C3XXControl modeExtension AM1 communication errorCheck electrical connections
C4XXControl modeCommunication error, Open ThermextensionCheck Open Therm extension
C5XXControl mode, max. pump speedCommunication error, variable speed
internal pump
Check the setting of coding address "30"
C6XControl mode, max. pump speedCommunication error, external variable speed heating circuit pump, heating circuit 2
(with mixer)
Check setting of coding address "E5"
C7XXControl mode, max. pump speedCommunication error, external variable speed heating circuit pump, heating circuit 1 (without
mixer)
Check setting of coding address "E5"
C8XControl mode, max. pump speedCommunication error, external variable speed heating circuit pump, heating circuit 3
(with mixer)
Check setting of coding address "E5"
CdXXControl modeCommunication error, Vitocom 100
(KM BUS)
Check connections, Vitocom 100 and coding
address "95"
CEXXControl modeCommunication error, ext.
extension
Check electrical connections
CFXControl modeCommunication error,
LON communication module
Replace the LON communication module
d6XXControl modeInput DE1 reports a fault at extension EA1Remove fault at the appliance concerned
d7XXControl modeInput DE2 reports a fault at extension EA1Remove fault at the appliance concerned
d8XXControl modeInput DE3 reports a fault at extension EA1Remove fault at the appliance concerned
dAXControl mode without room influenceShort circuit, room temperature sensor, heating circuit 1 (without
mixer)
Check room temperature sensor, heating circuit 1
dbXControl mode without room influenceShort circuit, room temperature sensor, heating circuit
2 (with mixer)
Check room temperature sensor, heating circuit 2
dCXControl mode without room influenceShort circuit, room temperature sensor, heating circuit
3 (with mixer)
Check room temperature sensor, heating circuit 3
ddXControl mode without room influenceLead break, room temperature sensor, heating circuit 1 (without
mixer)
Check room temperature sensor for heating circuit 1 and remote control settings
dEXControl mode without room influenceLead break, room temperature sensor, heating circuit 2 (with mixer)Check room temperature sensor for heating circuit 2 and remote control settings
dFXControl mode without room influenceLead break, room temperature sensor, heating circuit 3 (with mixer)Check room temperature sensor for heating circuit 3 and remote control settings
E0XControl modeFault external
LON subscriber
Check connections and LON subscribers
E4XXBurner blockedFault, supply
voltage 24 V
Replace the control
unit.
E5XXBurner blockedFault, flame
amplifier
Replace the control
unit.
E8XXBurner in a fault stateThe ionisation current lies outside the permissible rangeCheck the ionisation electrode and cable.
Press reset button
R.
EAXXBurner in a fault stateThe ionisation current lies outside the permissible range during calibrationCheck the ionisation electrode and cable.
Press reset button
R.
EbXXBurner in a fault stateHeat draw-off repeatedly too low during calibrationInitiate a heat draw-off. Switch the boiler OFF and ON again.
Press reset button
R.
ECXXBurner in a fault stateParameter fault during calibrationPress reset button
R or
replace boiler coding card and press reset button R.
EdXXBurner in a fault
state
Internal faultReplace the control unit.
EEXXBurner in a fault stateFlame signal is not present or too weak at burner startCheck the ionisation electrode and connecting cable, measure the ionisation current, check the gas supply (gas pressure and gas flow limiter), check the gas train, ignition, ignition module, ignition electrodes and the condensate drain.
Press reset button
R.
EFXXBurner in a fault stateFlame is lost after flame has built.Check the gas supply (gas pressure and gas flow limiter), check the flue gas/ventilation air system for flue gas recirculation, check the ionisation electrode (replace if required).
Press reset button
R.
F0XXBurner blockedInternal faultReplace the control unit.
F1XXBurner in a fault stateFlue gas temperature limiter has respondedCheck the heating system fill level. Vent the system. Press reset button R after the flue system has cooled
down.
F2XXBurner in a fault stateThe temperature limiter has respondedCheck the heating system fill level. Check the circulation pump. Vent the system. Check the temperature limiter and connecting cables
Press reset button
R.
F3XXBurner in a fault stateFlame signal is already present at burner startCheck the ionisation electrode and connecting cable. Press reset button
R.
F8XXBurner in a fault stateThe fuel valve closes too lateCheck the gas train. Check both control paths.
Press reset button
R.
F9XXBurner in a fault stateFan speed too low during burner startCheck the fan, the fan connecting cables and power supply; check the fan control.
Press reset button
R.
FAXXBurner in a fault stateFan not at standsillCheck the fan, fan connecting cables and fan control. Press reset button
FCXXBurner in a fault stateGas train faulty or faulty modulation valve control or flue gas path blockedCheck the gas train. Check the flue gas system.. Press reset button R.
FdXXBurner in a fault stateFault, combustion controllerCheck ignition electrodes and connecting cables Check whether a strong interference (EMC) field exists near the appliance.
Press reset button
R.
Replace control unit if the fault persists.
FEXXBurner blocked or in a fault stateBoiler coding card or main PCB faultyPress reset button
R. Replace boiler coding card or control unit if the fault persists.
FFXXBurner blocked or in a fault stateInternal fault or reset button R blockedStart the appliance again. Replace the control unit if the appliance will not
restart.

Get a FREE Quote on a New Boiler

Trustpilot
Broken Boiler?
Get a FREE Quote Today
  • Save up to £500 per year
  • Expert, Trusted Installers
  • New Boiler in 24-48 hours

Boilerhut Limited
UK Head Office
Above Willis Systems
Lamby Industrial Park
Wentloog Avenue
Cardiff
CF3 2EX

Who We Are

  • About us
  • Contact us
  • Our Blog
  • Privacy Policy
  • Terms and Conditions

Our Products

  • Our Boiler Range
  • Radiator Installation
  • Nest Thermostats

Boiler Range

  • Oil Boiler Installation
  • LPG Boilers
  • Gas Boiler Installation

Our recent posts

  • We’ve reached 500 reviews on Trustpilot
  • Baxi vs Worcester Bosch Boilers
  • Why is my boiler pressure too high? | How you can fix this common issue
  • I don’t have any hot water! | 13 Common Causes and How to Fix Them
  • What size combi boiler do I need?

You’re in Safe Hands

Gas Safe boiler installation

Registered in England & Wales, company number: 8615540 Vat number: GB- 169 0436 95
  • About us
  • Contact us
  • Our Blog
  • Privacy Policy
  • Terms and Conditions
Scroll to top