E55 High
Your boiler has lost its fine-tuning and needs to undergo a self-calibration process to ensure the gas and air are burning efficiently.
Technical description: Calibration required
Typical repair cost: £0-120 (including labour)
DIY fix possible
Press and hold the 'R' (Reset) button for at least 2 seconds.Wait for the boiler to complete its automatic calibration sequence, which may take several minutes.Ensure all radiator valves are open to allow the boiler to disperse heat during the process.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E55 — no call-out fees, no surprises.
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Parts commonly replaced
- None (usually a software reset)
- Flame sensing electrode
- Gas valve
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