FD 231 High
Your boiler has lost power or experienced an electrical error while it was already trying to show a different fault code.
Technical description: The power has been interrupted during a lockout
Typical repair cost: £100-350 (including labour)
DIY fix possible
Locate the reset button on the front control panelPress and hold the reset button for five secondsWait for the boiler to restart and see if a different fault code appears
Protect yourself from future repair bills
A boiler cover plan would cover faults like FD 231 — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
- Wiring Loom
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