A05 High
Your boiler has stopped working because its internal fan is unable to communicate with the main control board, preventing the boiler from safely clearing waste gases.
Technical description: Fan problem – tachometer signal interrupted for 1 hour or longer – check the wiring and the fan
Typical repair cost: £220-£450 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like A05 — no call-out fees, no surprises.
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Parts commonly replaced
- Fan assembly
- Wiring harness
- Printed Circuit Board (PCB)
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