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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing).
Published: February 23, 2024. Updated: February 23, 2024

Worcester E9 Fault Code – How To Fix

Worcester E9 Fault Code

If you come across an E9 fault code on your Worcester Bosch boiler, this indicates that the safety temperature limiter has tripped.

This safety feature will prevent the water in the central heating flow from exceeding 105°C.

There could be various reasons for this, including faulty limiters, a blocked or failing boiler pump, a malfunctioning heat exchanger, or a defective PCB.

It’s important to note that attempting DIY fixes is illegal but also unsafe. Therefore, you must seek professional assistance, and the cost may vary depending on the component and location.

It’s essential to act quickly and seek expert intervention. An E9 fault code on your Worcester Bosch boiler indicates the activation of a critical safety mechanism.

Addressing the E9 Fault

  • Safety Temp Limiter Failure: This component, vital for monitoring water temperature, may need replacement if malfunctioning. If this is the problem you may also see a ‘220’ or ‘221’ cause code.
  • Boiler Pump Issues: A blockage or failure in the pump impedes water circulation, causing overheating and the E9 error.
  • Heat Exchanger Malfunction: Limescale buildup in the exchanger can lead to overheating, necessitating maintenance or replacement. A heat exchanger issue may also show a cause code of ‘219’.
  • PCB Complications: A faulty PCB disrupts the boiler’s operation, potentially requiring replacement.

Worcester Bosch 8000 50kW Life Combi Boiler - E9 Fault Code.

Professional Assistance Required

Due to legal and safety considerations, E9 fault repair is not a DIY task. A qualified heating engineer should be contacted to diagnose and rectify the problem.

Costs for repairs vary. Specific component replacements range from minor to significant expenses. This sometimes makes boiler replacement a more cost-effective solution.

Warranty Considerations

Warranty coverage for E9 fault repairs depends on your boiler’s guarantee terms and the nature of the fault. Typically, manufacturing or material defects are covered, but verifying your warranty’s status and terms is crucial.


The E9 fault code on a Worcester Bosch boiler is a serious issue requiring immediate attention from a professional. Understanding the potential causes and ensuring timely repairs restores your boiler’s functionality and safeguards your home from the risks of overheating.

Always consult with a qualified engineer to ensure safe and efficient boiler operation.

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