FLASH ON ON High
Your boiler's internal computer has developed an electrical fault and is unable to control the heating process.
Technical description: Printed circuit board (PCB) fault
Typical repair cost: £280-450 (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 FLASH ON ON — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
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