12 High
Your boiler's internal thermometer for the central heating system has stopped working correctly, which means the system cannot monitor or control the water temperature.
Technical description: Failed heating sensor – issue with heating sensor and could need replacing
Typical repair cost: £90-160 (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 12 — no call-out fees, no surprises.
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Parts commonly replaced
- Central Heating NTC Sensor
- Sensor Wiring Harness
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