BoilerFaultCodesTechnical description
PILOT WILL NOT STAY LIT WHEN THE GAS CONTROL VALVE KNOB IS RELEASED
What causes this fault?
This fault occurs when the boiler's safety monitoring system fails to detect a stable flame after the lighting process. The most common reason is a worn-out thermocouple that can no longer send a signal to the gas valve, or the overheat thermostat has tripped and cut the internal circuit to prevent damage. Essentially, the boiler shuts down the gas supply because it believes it is unsafe to stay running.
This issue often surfaces during the first cold spell of autumn when the boiler is switched back on after being idle during the summer months.
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.