Vaillant Home Combi Fault codes & diagnostics

Your boiler has lost its ability to measure the temperature of the water moving through your heating system, so it has shut down as a precaution to prevent overheating.

Your boiler has lost the ability to measure the temperature of the water coming back into it, so it has turned itself off as a safety precaution.

Your boiler has stopped working because it is unable to accurately measure the temperature of the water inside the system due to a faulty electrical connection or sensor.

Your boiler is struggling to read the temperature of the water returning to it, which causes it to stop working to avoid potential damage.

Your boiler has detected that it is running much hotter than it should be and has automatically switched itself off to prevent permanent damage.

Your boiler has stopped working because the amount of water circulating inside the heating system has dropped too low.

Your boiler has detected that the water temperature is rising or falling much faster than expected in different parts of the system, so it has shut itself down to prevent damage.

Your boiler has detected that the water inside is heating up far too quickly for the system to handle safely, so it has shut itself down to prevent any damage.

Your boiler is failing to light the flame needed to produce heat or hot water.

Your boiler is failing to stay lit, which means it has safely shut itself down because it cannot consistently produce or hold a flame.

Your boiler has detected that the fan, which pushes waste gases outside, isn't spinning at the correct speed to ensure safe operation.

Your boiler's communication system is experiencing a power supply issue, causing it to lose its ability to talk to your thermostat or internal components.

Your boiler has detected an issue with the internal safety mechanism that controls the gas flow, so it has safely shut itself down to prevent operation.

Your boiler has developed a serious internal electronic fault where the main memory chip that controls its settings is no longer communicating correctly.

Your boiler's main computer control panel is failing to process signals from its sensors, meaning it cannot safely operate the system.

Your boiler has detected that its internal control brain is overheating and has shut itself down to prevent damage.

Your boiler's computer is struggling to safely detect or manage the flame, so it has shut itself down to prevent any unsafe operation.

Your boiler is struggling to keep a steady flame, causing it to shut down for safety reasons.

Your boiler has lost its identity settings, preventing it from knowing how to operate correctly because its internal computer configuration has been wiped or corrupted.

Your boiler is struggling to accurately measure the temperature of the water flowing through the system, so it has safely shut itself down to prevent overheating.

Your boiler is having trouble reading the water pressure or temperature accurately, which has caused it to switch itself off for safety.

Your boiler's internal water pressure gauge is failing to signal correctly, meaning the system cannot confirm it has enough water to operate safely.

Your boiler is struggling to accurately measure its own internal water pressure, so it has stopped working to prevent potential damage to the system.

Your boiler is struggling to detect the water pressure inside the system, which prevents it from firing up safely.

Your boiler has detected an issue with how it clears water or exhaust gases, meaning it has switched itself off to stay safe.

Your boiler has detected that there is not enough water circulating inside the system to safely heat your home, triggering a shutdown to prevent internal damage.

Your boiler is struggling to compare the temperature of the water leaving and returning, meaning it cannot safely control its heating output.

Your boiler is struggling to read its own internal water temperature correctly, so it has stopped working to prevent potential damage.

Your boiler is failing to ignite because it cannot detect the spark required to start the flame, meaning you will not have any heating or hot water.

Your boiler's water circulation pump is struggling to operate, which prevents heat from moving through your home's radiators and taps.

Your boiler has stopped working because the water pressure inside the heating system has dropped too low.