212 High
Your boiler is overheating because the water inside is heating up faster than it can be moved around the system.
Technical description: The temperature recorded by the flow temperature sensor or the safety sensor is rising too quickly
Typical repair cost: £120-£350 (including labour)
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure is between 1 and 1.5 bar on the pressure gaugeCheck if the pump is running or if there are any obvious signs of a leak
Protect yourself from future repair bills
A boiler cover plan would cover faults like 212 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulating Pump
- Flow Temperature Sensor
- Main Heat Exchanger (Flushing)
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