Vaillant ecoTEC 65kW Fault codes & diagnostics

Your boiler has stopped working because it has lost the connection to the sensor that monitors the temperature of the water flowing through your heating system.

Your boiler has lost its connection to a temperature sensor, meaning it cannot correctly measure the heat of the water returning to the system and has safely shut down to prevent potential damage.

Your boiler has stopped working because one of the sensors that measures the temperature of the water inside the system is providing a faulty electrical reading.

Your boiler has detected a faulty reading from a temperature sensor that monitors the water returning to the system, causing the unit to shut down for safety.

Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage.

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

Your boiler has detected that the water inside is heating up or cooling down much faster than it should, so it has shut itself off to prevent potential damage.

Your boiler has detected that the water temperature is rising too quickly, which means it has switched itself off to prevent overheating.

Your boiler has detected a signal suggesting a flame is present even when it should be turned off, so it has shut down to ensure your safety.

Your boiler is trying to start up but cannot successfully light the flame, so it has safely shut itself down to prevent gas from building up.

Your boiler is failing to stay lit because it cannot detect a stable flame during operation.

Your boiler's air circulation system is not starting correctly, which prevents the unit from firing up safely.

Your boiler is having trouble communicating with its external controllers or thermostats, preventing it from receiving instructions to heat your home.

Your boiler has detected an issue with the internal component that controls the gas supply, meaning it cannot safely start up to provide heat or hot water.

Your boiler's internal computer has encountered a memory error and cannot read the essential configuration data required to operate safely.

Your boiler's internal computer has detected an electrical error, likely caused by a faulty sensor or a loose connection that is preventing it from operating safely.

Your boiler's main control unit is overheating, which has caused it to shut down to prevent damage to its internal electronics.

Your boiler has detected an internal communication problem with its electronic control system, meaning it cannot safely confirm the flame is burning correctly.

Your boiler's computer has lost its internal identification settings and does not know how to operate your specific model correctly.

Your boiler has lost the ability to accurately measure the temperature of the water circulating inside it, so it has shut down as a precaution to prevent overheating.

Your boiler has detected a temperature difference between its pipes that suggests a sensor is misreading the situation, causing it to shut down for safety.

Your boiler's water pressure sensor is reporting a reading that is outside of the expected range, preventing it from operating safely.

Your boiler is struggling to confirm that water is moving around the system because it cannot detect the necessary pressure change when the pump starts.

Your boiler has detected an issue with the system that removes waste water or controls airflow, preventing it from operating safely.

Your boiler is trying to start up but the internal fan is not spinning properly, preventing the heating from firing up.

Your boiler is struggling to light its flame, meaning your heating and hot water will likely stop working soon.