F.63 High
Your boiler's computer memory has developed a communication failure, preventing the internal system from starting up.
Technical description: EEPROM (Electrically Erasable Programmable Read-Only Memory) error
Typical repair cost: £250-£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 F.63 — no call-out fees, no surprises.
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Parts commonly replaced
- Main PCB (Printed Circuit Board)
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