9 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Ideal Classic SE
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Your boiler is unable to start because the small ignition flame is not lighting, which is preventing the main burner from firing up.
Your boiler's pilot light is going out as soon as you let go of the ignition button, meaning the main burner cannot start.
Your boiler has started an initial pilot flame, but the main burner is failing to ignite to provide heat.
Your boiler has switched itself off because it has become too hot inside, likely due to a circulation problem or a component failure.
Your boiler is failing to start because it cannot successfully ignite its starting flame, meaning your heating and hot water will not turn on.
Your boiler's small pilot flame is failing to stay on, which prevents the system from firing up to provide heating or hot water.
Your boiler's small pilot light is working, but the main burner is failing to ignite to provide heat or hot water.
Your boiler has switched itself off completely because it has gotten too hot, which is a safety feature designed to prevent damage.
Your boiler is losing the water pressure it needs to work properly, which usually means there is a leak somewhere in your radiators, pipes, or the boiler itself.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes