High
Lock Out After 15 Seconds on Potterton Statesman

Your boiler is lighting, but it cannot confirm the flame is stable, so it shuts down for safety reasons to prevent fuel from building up.

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.

What the manual says

Manufacturer manual

Burner Starts, Flame Established But Goes To Lock Out After 15 Seconds

From this model's manual
Verified against the Potterton Statesman installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

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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