19 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Suprima HE
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
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Your boiler has detected a fault and has safely shut itself down to prevent damage, meaning you currently have no heating or hot water.
Your boiler has stopped working because it can no longer accurately read the temperature of the water inside it.
Your boiler has detected that it is getting too hot and has safely shut itself down to prevent damage.
Your boiler has detected that it is dangerously overheating and has automatically shut down to prevent damage or a safety hazard.
Your boiler is trying to start up but is unable to ignite its flame, so it has safely shut down to prevent gas from building up.
Your boiler has detected that the flame inside has gone out unexpectedly while it was running, so it has safely shut itself down to prevent gas from escaping.
Your boiler is failing to detect the airflow needed for safe operation, so it has shut down to prevent it from firing up improperly.
Your boiler has paused its normal operation temporarily because it is waiting for a system condition to improve, such as the water cooling down or the pressure stabilizing, before it tries to restart.
Your boiler is operating normally and is currently heating your water or home as requested.
Your boiler has lost all power and is completely switched off, meaning you currently have no heating or hot water.
Your boiler is currently cooling down its internal components, which is a normal process that happens every time your heating or hot water turns off.
Your boiler is currently running a standard safety procedure to clear out any leftover gases before attempting to light the flame.
Your boiler is currently operating normally as it is in the process of burning gas to heat your water or home.
Your boiler is failing to light the internal burner because the component responsible for creating the initial spark or heat has stopped working.
Your boiler is currently running a series of built-in safety checks before it attempts to light the burner.
Your boiler has detected a safety fault and has stopped working to prevent further issues, meaning you currently have no heating or hot water.
Your boiler is performing a routine cycle to safely move remaining heat away from the unit, which is a normal part of the shutdown process after your heating has been running.
Your boiler is currently cooling down its internal components after finishing a cycle of heating your water, which is a normal process.
Your boiler is currently in a waiting state and is not actively calling for heat, which usually means it is working correctly but just sitting idle.
BoilerFaultCodes