H.03 – .01 High
Your boiler's computer parts are having trouble talking to each other, which means the system cannot operate for heating or hot water.
Technical description: Communication error with the printed circuit board (PCB)
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 H.03 – .01 — no call-out fees, no surprises.
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Parts commonly replaced
- Main Printed Circuit Board (PCB)
- Wiring Harness
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