High
90 on Alpha E-Tec Plus 33

Your boiler has detected an issue with the flame detection system, forcing a safety shutdown to prevent improper operation.

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

Flame signal beyond limit - The flame signal is beyond the adjustment range required for an extended period of time

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

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