Boiler Error Codes for Bosch Models ExplainedJune 29, 2018
Modern boilers are the most reliable and efficient they have ever been and Worcester Bosch models are some of the best on the market. However, once in a while things can go wrong and this can leave the average homeowner scratching their head, not knowing what the problem is.
Your boiler will have a display panel and, should something go awry, it is here that an error code will show which gives insight into the source of the issue. To help you troubleshoot your boiler problems, we’ve put together a handy list of common boiler error codes for Worcester Bosch models.
With locking errors, your boiler will show a flashing warning triangle and a fault code. At the same time, a static cause code will display. After clearing the fault, you will need to press the reset button.
|Fault code||Cause code||Possible cause|
|9A||362||Incorrect heat control module (HCM) fitted|
|9U||233||Faulty or disconnected code plug|
|B7||257||Replacement control board needed|
|C6||215/216||Fan running too fast or too slow|
|C7||214/217||Fan not running or airflow blocked|
|D1||240||Sensor wet or damaged|
|D1||241||Sensor disconnected or damaged|
|E2||222/223||Flow sensor shorted, damaged or disconnected|
|E5||218/332||Primary flow sensor overheated|
|E9||219||Main heat exchanger overheated – maximum temperature 105°C|
|E9||220||Maximum temperature sensor on main heat exchanger has failed|
|E9||221||Maximum temperature sensor on main heat exchanger not recognised|
|E9||224||Flue gas thermostat overheated|
|EA||227||Failure of four ignition attempts|
|EA||229||Loss of flame during operation|
|EA||234||Gas valve coil disconnected|
|EA||261||Flame not established during first four seconds of the ignition period|
|EA||338||Pump is not detecting water – check pressure gauge and repressurise to 1 bar|
With these errors, the boiler will stop operating without fault information automatically displayed. To see the codes, you need to press the spanner/return button. These errors will clear themselves after the associated fault is cleared.
|Fault code||Possible cause|
|A1||Little or no water in system – check pressure gauge and repressurise to 1 bar|
|C1||Fan has stopped|
|EA||No flame is detected – the boiler will block during four ignition attempts and then turn into a locking fault|
|EF||Boiler operating at minimum burner load with a temperature difference greater than 18°C between flow and return|
|No code||Air lock or reduced water – check pressure gauge and repressurise to 1 bar|
|260||Sensor disconnected or no water – check pressure gauge and repressurise to 1 bar|
Some of these common problems have easy fixes that you can carry out yourself – check out our blog post covering some of these solutions. If you need some help, an expert engineer from Rudkin & Herbert will be able to offer you quick and reliable assistance for maintenance and repair work. As a well-established business with a strong reputation throughout Leicestershire, you can always depend on our helpful team for high quality workmanship. Don’t hesitate to get in touch with any enquiries.