17 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Promax SL
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 is currently trying to light its flame, but it is taking longer than expected to successfully start up.
Your boiler has sensed it is getting too hot and has shut itself down as a safety precaution.
Your boiler has automatically turned itself off because internal sensors detected it was getting too hot, likely due to a flow restriction or a faulty sensor.
Your boiler is correctly receiving electrical power and is currently in standby mode, which is the normal operational state.
Your boiler has stopped working because it cannot confirm that harmful exhaust gases are being safely cleared through the flue pipe.
Your boiler has stopped working because its internal safety switch is stuck and cannot confirm it is safe to start the burner.
Your boiler is operating normally and is successfully heating your water or home as requested.
Your boiler has detected a problem with a temperature sensor on the main internal heat exchanger, causing it to shut down for safety.
Your boiler is not receiving the steady electrical voltage it needs to safely fire up and run.
Your boiler thinks a flame is present when it shouldn't be, causing the system to shut down for safety purposes.
Your boiler has switched itself off because the internal temperature sensors are giving conflicting or unusual readings, meaning it cannot safely regulate the heat.
Your boiler has stopped working because it failed to light the flame, which could be due to a simple issue like a gas supply problem or a fault with the internal ignition components.
Your boiler has stopped working because it couldn't light the flame, which means your heating and hot water will not turn on.
Your boiler has tried and failed to light the flame several times, so it has shut itself down for safety.
Your boiler has detected that it has become dangerously hot and has automatically shut itself down to prevent damage.
Your boiler has experienced an internal computer failure and has shut down for safety, meaning it will no longer provide heating or hot water.
Your boiler has switched itself off because it has detected that water is failing to move through the system correctly, causing it to overheat.
BoilerFaultCodes