H.01 – .00 High
Your boiler has lost its internal connection to the main gas control unit, meaning it cannot safely manage the fuel it needs to fire up.
Technical description: Loss of communication between gas valve and boiler board. Possible fault in air/gas unit or loose connection to gas valve.
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 H.01 – .00 — no call-out fees, no surprises.
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Parts commonly replaced
- Gas Valve
- Wiring Harness
- Main PCB
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