Worcester Boiler broken down? we have a list of fault codes that could help to get you up and running fast. If you need one of our engineers to attend, then please call us on 01202 497311


We don’t just fix Worcester Bosch Boiler fix all makes and models see our boiler break down page


Worcester Bosch Fault Codes


9A Boiler has been fitted with incorrect Heat Control Module (HTM).

9U The code plug could be faulty or not properly connected.

B7 You need to replace the control board

C6 The system is running too fast or too slow.

C7 Fan is not running, or the airflow could be blocked.

D1 Sensor could be wet, damaged or disconnected. The boiler will block for 300 seconds. Or could be overheating

E2 The Flow sensor has shorted, is damaged or disconnected.

E5 The primary flow sensor has overheated.

E9 The main heat exchanger has overheated as the main temperature is 150 degrees, Maximum temperature sensor on the main heat exchanger cannot be recognised or has failed, the flue gas thermostat has overheated

EA Failure after four ignition attempts. The boiler will wait 30 seconds before another attempt is made, A flame has been extinguished due to either moisture in the sump, a blocked sump or strong wind in the flue, Gas valve coil has been disconnected, Flame has not extinguished within first 4 seconds of ignition, There is an error as the pump is not detecting water. Check the pressure gauge and re-pressurise to 1 bar

A1 Little or no water in the system- Check pressure gauge and re-pressurise to 1 bar.

C1 Fan has stopped.

EA No flame is detected and so the boiler will block during 4 attempts before going to Locking fault

EF The boiler is operating at minimum burner load and there is higher flow temperature of 18 degrees.

260  Sensor has been disconnected or there is no water content- check pressure gauge and repressure to 1 bar.