H.03 -.00 High
Your boiler has stopped working because its internal sensors or control system are struggling to talk to each other correctly.
Technical description: Temporary error with communication, negative temperature coefficient thermostat (NTC) or flue sensor. Sensor could also be unconnected or have a bad connection.
Typical repair cost: £90-180 (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 -.00 — no call-out fees, no surprises.
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Parts commonly replaced
- Central heating NTC temperature sensor
- Flue sensor
- Wiring harness
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