High
E01 on Heatline Sargon 28

Your boiler is unable to light the flame needed to heat your water and home, often because the gas supply is interrupted or there is a problem with the internal spark.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

Ignition failure: The boiler has failed to ignite after a series of attempts. Check gas supply and ignition electrode.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

E02View →E04View →

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