BoilerFaultCodesTechnical description
Main burner fails to light and pilot is extinguished when pressure on the control knob is released - Pilot rate too low.
What causes this fault?
This fault occurs when the boiler's safety mechanism cannot detect a strong enough pilot flame to proceed with ignition. The most common reason is a build-up of soot or debris in the small pilot burner hole, or a worn-out thermocouple sensor that can no longer signal to the gas valve that it is safe to stay open.
This issue often surfaces after the boiler has been switched off over the summer, as dust and debris can settle in the pilot assembly during periods of inactivity.
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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