F0 High
Your boiler has experienced an internal electrical communication error, which means the main control box cannot talk to the internal components correctly.
Technical description: Internal error – electrical connector contacts or programmer interface module – check ignition leads are not loose.
Typical repair cost: £120-£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 F0 — no call-out fees, no surprises.
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Parts commonly replaced
- Programmer Interface Module
- Ignition Leads
- Printed Circuit Board (PCB)
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