Ariston Clas System 28 Fault codes & diagnostics

Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage to its internal parts.

Your boiler is currently unable to detect the water pressure inside the system, which is preventing it from firing up safely.

Your boiler has detected that water is not moving through your heating system correctly, which is preventing it from heating your home safely.

Your boiler has detected that water is struggling to flow through your heating system, so it has safely shut down to prevent overheating.

Your boiler is struggling to move water through your heating system, usually because there isn't enough water inside or the internal pump is blocked.

Your boiler is struggling to push water around your heating system, usually because there is air trapped inside or the water pressure is too low.

Your boiler has detected that water is not flowing around your heating system properly, so it has shut down to prevent itself from overheating.

Your boiler has lost the ability to measure the temperature of the water flowing to your radiators, so it has shut down to prevent overheating.

Your boiler's internal sensor that monitors the temperature of the water returning to the system is failing to send a signal, causing the unit to stop working for safety reasons.

Your boiler is struggling to move water around your heating system effectively, so it has stopped running to prevent damage.

Your boiler has detected that hot water is not flowing around your radiators effectively, likely due to low pressure or a blockage.

Your boiler has detected that water is not flowing around your heating system as efficiently as it should, possibly due to a blockage or a pump issue.

Your boiler's computer has encountered a memory error and cannot safely manage its internal settings or operations.

Your boiler has lost the ability for its internal parts to talk to each other, so it has shut down as a precaution.

Your boiler's computer is having an internal hiccup and cannot communicate with its own systems to run the heating or hot water safely.

Your boiler has detected an internal communication error with its main control unit, meaning it has shut down as a safety precaution to prevent incorrect operation.

Your boiler's internal computer is experiencing a communication error and has decided to shut down for safety reasons.

Your boiler's electronic brain has encountered an internal error and cannot communicate with the system correctly to start heating.

Your boiler has stopped working because it is unable to light the gas flame needed to heat your home.

Your boiler is trying to start but the flame is failing to stay lit, so it has shut down as a safety precaution.

Your boiler has attempted to start three times but failed to keep its flame alight, so it has locked itself out for safety reasons.

Your boiler is failing to start because it detects a sensor error that thinks the internal fan is running even when it is switched off.

Your boiler is struggling to clear exhaust gases due to a sensor sensing a blockage or a faulty fan, which forces the system to stop for safety reasons.

Your boiler is struggling to detect the necessary airflow to safely operate, causing it to shut down to prevent potential issues.

Your boiler is struggling to accurately measure the temperature of the water inside it, so it has stopped working to prevent potential damage.

Your boiler has detected that the water flowing to a secondary heating area, like an upstairs radiator circuit or underfloor heating, has become dangerously hot and has shut itself down to prevent damage.

Your boiler has detected that the water temperature in the third heating zone has become dangerously high, so it has purposefully turned itself off to prevent any damage.