E.04 – .06 High
Your boiler has shut down because it is getting too hot inside, likely due to a lack of water flow or a faulty sensor safety check.
Technical description: Permanent fault. Critical flue gas temperature value reached, no circulation or sensor fault.
Typical repair cost: £120-£350 (including labour)
DIY fix possible
Check if your central heating valves are openEnsure your radiator valves (TRVs) are turned upCheck the boiler pressure gauge and top up to 1.5 bar if lowReset the boiler by turning the selector switch to 'R' for five seconds
Protect yourself from future repair bills
A boiler cover plan would cover faults like E.04 – .06 — no call-out fees, no surprises.
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Parts commonly replaced
- Flue Thermistor (NTC Sensor)
- Circulation Pump
- Main Heat Exchanger (if scaled)
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