BoilerFaultCodesPotterton Lock Out After 15 Seconds Fault Code
Also written as LOCKOUTAFTER15SECONDS — same fault.
The Potterton Lock Out After 15 Seconds fault code means: 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.. It appears on 1 Potterton model in our database.
Technical description: Burner Starts, Flame Established But Goes To Lock Out After 15 Seconds
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Potterton models that show the Lock Out After 15 Seconds fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Lock Out After 15 Seconds fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026