Baxi BBU 45/4 Fault codes & diagnostics

Your boiler is struggling to read its internal temperature, so it has safely shut itself down to prevent it from getting too hot.

Your boiler has detected that the internal control computer installed is not the correct version intended for this specific model, preventing it from operating safely.

Your boiler is struggling to accurately measure the temperature of the water used for your taps, which usually prevents the unit from heating water correctly.

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

Your boiler has detected that hot water is not flowing properly around your radiators or pipes, so it has shut down to prevent overheating.

Your boiler experienced a power cut or electrical blip while it was already trying to deal with an existing system error, meaning it has now lost track of what triggered the fault.

Your boiler has stopped working because it cannot detect a flame or is not receiving a steady supply of gas.

Your boiler has detected an internal communication error and has safely shut itself down as a precaution.

Your boiler has detected a blockage or issue in the pipe that carries away internal wastewater, causing it to shut down to prevent internal damage.

Your boiler has stopped working because the mechanical fan responsible for pushing out waste gases is failing to communicate with the system.

Your boiler has stopped running as a safety precaution and needs a manual restart to try and light the flame again.