E.04 – .08 High
Your boiler has shut down because it has detected it is getting too hot, likely due to a lack of water flow or a sensor failure.
Technical description: Permanent fault. Maximum safe temperature value reached, safety thermostat open-circuited, no circulation, sensor not or badly connected, bad connection or sensor fault.
Typical repair cost: £90-250 (including labour)
DIY fix possible
Check that the boiler pressure is between 1.0 and 1.5 bar on the gaugeEnsure all radiator valves are fully open to allow water circulationPerform a reset by turning the selector knob to the 'R' position for five seconds
Protect yourself from future repair bills
A boiler cover plan would cover faults like E.04 – .08 — no call-out fees, no surprises.
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Parts commonly replaced
- Pump
- Overheat Thermostat
- NTC Temperature Sensor
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