231 / FD High

Worcester Bosch 231 / FD Fault Code

Also written as 231FD — same fault.

The Worcester Bosch 231 / FD fault code means: your boiler has detected a disruption in its electrical supply, which has caused it to temporarily shut down the system.. It appears on 1 Worcester Bosch model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Mains power error - electrical power interruption
Typical repair cost £100-250 (including labour)

DIY fix possible

Check that your boiler's power supply switch is turned onIdentify and reset your boiler's circuit breaker in your home's consumer unitPress the 'Reset' button on the front of your boiler control panel

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Worcester Bosch models that show the 231 / FD fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch 231 / FD fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026