E.04 – .03 High
Your boiler has shut down because water is not moving through the system properly, causing it to overheat.
Technical description: Permanent fault. Critical flow temperature reached, non-existent or insufficient circulation.
Typical repair cost: £120-£350 (including labour)
DIY fix possible
Check if your radiator valves are openEnsure the boiler pressure gauge is between 1 and 1.5 barCheck for frozen condensate pipes during cold weatherTry resetting the boiler using the selector switch
Protect yourself from future repair bills
A boiler cover plan would cover faults like E.04 – .03 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulating pump
- Primary heat exchanger
- Flow temperature sensor
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