31 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Promax Combi
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 an issue with its internal safety checks involving the fan and air flow, meaning it cannot safely ignite to provide heating or hot water.
Your boiler has detected that water is not circulating correctly through the system, preventing it from firing up to heat your home or water.
Your boiler has detected a problem with how it clears waste gases, which prevents it from firing up for your heating or hot water.
Your boiler has detected a problem safely moving waste gases out through the flue pipe, which has caused it to shut down for safety.
Your boiler has detected a general ignition or flame failure, meaning it has temporarily stopped working for safety.
Your boiler has detected that the fan, which safely clears waste gases away, is not spinning as fast as it needs to for the boiler to light safely.
Your boiler has stopped working because water is not moving through the system properly, likely due to a stuck pump or a blockage.
Your boiler is lighting but cannot detect that the flame has been lit, causing it to shut down shortly after for safety.
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Your boiler is starting up briefly but then failing to detect a flame, causing it to shut down for safety.
Your boiler has detected a system error or internal failure that is preventing it from starting up correctly.
Your boiler is failing to register that water is flowing through the system, which prevents it from igniting to provide heating or hot water.
Your boiler is failing to stay lit because it cannot detect that a flame has been successfully established.
Your boiler is receiving conflicting signals about whether it should be running, which is causing it to restart its warm-up cycle repeatedly.
Your boiler is struggling to confirm it is venting exhaust gases safely, causing the internal fan to run continuously at high speed to try and clear the system.
Your boiler is trying to start the fire needed to heat your water but is failing to detect a flame after several attempts.
Your boiler's control switch is currently stuck in the reset position, preventing it from starting up normally.
Your boiler has detected an issue with its internal airflow system and has shut down as a safety precaution.
Your boiler is letting you know that the hot water preheat function is active because the control dial is turned up.
Your boiler is struggling to detect the temperature of the water being heated, which means it has stopped providing hot water to your taps and shower.
Your boiler is failing to light the fuel or keep the burner running, meaning it is not producing any heat or hot water.
Your boiler has switched itself off because it has detected that the water inside has become or is at risk of becoming too hot.
Your boiler has detected a problem with how it disposes of waste gases, which has caused it to shut down for safety.
Your boiler is struggling to circulate water, most likely because the system pressure has dropped too low or the internal pump is stuck.
Your boiler is struggling to correctly measure the temperature of your hot water, which may lead to lukewarm water or no hot water at all.
Your boiler has detected that the internal sensor responsible for monitoring the temperature of your heating system has developed a fault.
Your boiler has stopped working because it failed to ignite the internal flame needed to heat your water.
Your boiler is trying to ignite the gas to create a flame, but for some reason, the burner is failing to light or stay lit.
Your boiler is struggling to detect consistent water circulation because trapped air is interfering with its internal sensors.
Your boiler is struggling to monitor its temperature because a sensor has stopped working, meaning it cannot safely provide heating or hot water.
Your boiler has automatically shut down because it has detected that its internal water temperature has become dangerously high.
BoilerFaultCodes