BoilerFaultCodes.com
E1-66 Medium Warning

Your boiler is struggling to automatically adjust its internal settings for the burner to stay lit and is attempting to restart itself.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Calibration condition error, wait for burner to restart

What causes this fault?

This fault occurs when the boiler's internal computer is unable to correctly balance the mix of gas and air required for a stable flame. It often happens if the gas valve is failing to regulate flow accurately or if the sensor that monitors the flame is dirty or worn out. As a result, the system repeatedly tries to recalibrate itself to ensure safe combustion.

Typical repair cost £100-250 (including labour)

DIY fix possible

Reset the boiler using the front control panelWait for the boiler to complete its automatic recalibration sequenceEnsure the gas supply to the property is active

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