46 High
Your boiler has stopped running because an external safety thermostat has detected that the water temperature has become too hot.
Technical description: Optional thermostat intervention
Typical repair cost: £80-180 (including labour)
DIY fix possible
Check that your pump is running and hasn't seizedEnsure all radiator valves and boiler service valves are fully openPress the 'Reset' button on the front of the boiler control panel
Protect yourself from future repair bills
A boiler cover plan would cover faults like 46 — no call-out fees, no surprises.
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Parts commonly replaced
- External limit thermostat
- Circulation pump
- Overheat sensor (NTC)
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