FLASH FLASH ON High
Your boiler's fan is failing to start or run correctly, which means the system cannot safely clear waste gases and will not fire up for your heating.
Technical description: Fan error
Typical repair cost: £180-350 (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 FLASH FLASH ON — no call-out fees, no surprises.
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Parts commonly replaced
- Fan assembly
- Air pressure switch
- Printed Circuit Board (PCB)
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