E9 High
Your boiler has sensed that it is getting too hot and has automatically shut down for safety.
Technical description: Safety temperature limiter in central heating (CH) flow has tripped the system pressure or safety temperature limiter needs checking
Typical repair cost: £100-280 (including labour)
DIY fix possible
Check that your system pressure is between 1 and 1.5 bar on the front gaugeTop up the water pressure using the white internal or external filling loop if it is too lowEnsure all radiator valves are fully open and there are no blockagesPress the 'reset' button on the boiler control panel once pressure is corrected
Protect yourself from future repair bills
A boiler cover plan would cover faults like E9 — no call-out fees, no surprises.
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Parts commonly replaced
- Overheat Thermostat
- Temperature Sensor (NTC)
- Circulation Pump
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