Keston C55 Fault codes & diagnostics

Your boiler has detected that it is getting too hot or does not have enough water inside, so it has safely shut itself down to prevent damage.

Your boiler has detected that the water inside the system is dangerously hot and has shut itself down to prevent damage or potential overheating.

Your boiler has detected that the water returning to it has become dangerously hot, so it has safely shut down to prevent damage.

Your boiler has detected that hot water is flowing in the wrong direction, indicating a potential issue with your heating system's circulation or internal sensors.

Your boiler is overheating because water isn't moving through the system fast enough, likely due to trapped air or a blockage in your pipes.

Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.

Your boiler has stopped working because it cannot communicate with the internal air circulation fan, which prevents the heating process from starting safely.

Your boiler has detected that the internal fan responsible for moving air is not communicating correctly with the main computer, preventing the boiler from firing up safely.

Your boiler has detected that the water is not circulating properly around your heating system, so it has shut down to prevent damage.

Your boiler is temporarily paused because it is waiting for its internal air extraction system to spin up correctly before it safely ignites.

Your boiler has lost power entirely, which could be due to a simple tripped switch or an internal electrical failure.

Your boiler is failing to light because it cannot detect a flame, meaning you currently have no heating or hot water.

Your boiler has detected that the power was turned off and back on again while it was already trying to deal with a fault, causing the system to lock itself for safety.

Your boiler's main computer brain is experiencing an internal error and cannot operate safely, meaning you currently have no heating or hot water.

Your boiler has stopped working because it has detected that the water inside is significantly hotter than it should be.

Your boiler has shut down because the water returning to it is much hotter than it should be, suggesting the pump or water flow through your radiators is blocked.

Your boiler is shutting down because the water inside isn't moving fast enough to carry the heat away, causing the temperature to spike dangerously.

Your boiler has stopped working because the internal component responsible for pushing combustion gases out of the flue cannot turn.

Your boiler has detected that the water inside the unit is not moving fast enough, meaning it is getting too hot, too quickly.

Your boiler has stopped working because one of its internal temperature sensors is giving a false reading due to an electrical connection issue or a faulty sensor part.

Your boiler has detected a faulty signal from a sensor that monitors the temperature of the water returning to the system, causing it to stop working for safety reasons.

Your boiler has lost signal from the temperature sensor that monitors the water circulating through the system, causing it to stop.

Your boiler has lost the signal from one of its internal temperature sensors, so it has safely shut down to prevent overheating.

Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.

Your boiler has encountered a critical system error and has shut itself down as a safety precaution.