Worcester Bosch Highflow 440 CDi Fault codes & diagnostics

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

Your boiler has failed to light the internal flame needed to heat your water, so it has shut down as a safety precaution.

Your boiler is failing to light the internal flame needed to heat your water, so it has safely shut itself down to prevent gas from building up.

Your boiler's hot water storage tank is experiencing a sensor error, meaning it currently cannot accurately detect the temperature of the water inside.

Your boiler has lost the signal from the sensor that monitors your hot water temperature, which means it cannot accurately heat your water.

Your boiler has detected that the internal pump, which pushes heat around your home, is not spinning correctly and the system has shut down to prevent damage.

Your boiler's computer memory chip is loose or missing, meaning the system doesn't know which model it is and has stopped working for safety.

Your boiler's computer is having trouble communicating with its internal components, causing the system to stop working safely.

Your boiler is experiencing an internal communication error between its electronic control boards.

Your boiler has lost the ability to communicate correctly with its internal control system, causing the unit to halt operations as a safety precaution.

Your boiler's computer is having trouble communicating internally, which has caused it to switch itself off for safety.

Your boiler's computer is having trouble communicating internally, which is preventing it from starting up correctly.

Your boiler's internal computer is experiencing a communication error, meaning it has lost track of its own settings and cannot safely operate.

Your boiler's main computer brain is having trouble communicating with the ignition system, which means it has safely shut itself down to prevent a potentially unstable start.

Your boiler is failing to start because it cannot confirm that the internal fan is moving air properly to ensure safe combustion.

Your boiler has detected that the water temperature has risen too high and has temporarily shut itself down to prevent damage.

Your boiler is unable to safely drain away the water it creates while running, so it has stopped working to prevent internal flooding.

Your boiler has detected that the internal water storage tank is overfilling, which forces the system to stop working to prevent internal flooding or water damage.

Your boiler has stopped working because it has lost the connection to the sensor that monitors its internal temperature, meaning it cannot safely regulate heat.

Your boiler has stopped working because it cannot detect the temperature of the water flowing through the system, likely due to a loose wire or a faulty sensor connection.

Your boiler is failing to light the internal burner, so it has safely shut itself down to prevent wasting gas.

Your boiler has detected an internal software or communication error that is preventing it from operating safely.

Your boiler's internal computer is experiencing a software memory error, meaning it cannot process instructions correctly and has shut down for safety.

Your boiler is struggling to keep the flame lit once it starts, causing it to shut down for safety.