High
neon flashing (Section I) on Potterton Performa System HE

Your boiler is failing to stay lit because it cannot reliably detect the flame needed to heat your home.

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

Burner extinguishes after 10 seconds - Flame sensing electrode and lead connections, electrode position, or flame current (approx 1 microamp).

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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