Self diagnose your boiler faults.
Worcester Bosch boilers continue to be one of the UK's most reputable brands for high-quality. Worcester Bosch boilers all offer high levels of performance. But just like any boiler Worcester Bosch have common faults, find the list of the faults below.
The EA229 & D5 error codes are very common faults on the Worcester Bosch boiler. If you get this code displaying on the boiler display then this will be a blocked condensate pipe. You can do a DIY fix or you can contact one of our engineers who would be happy to help, Call one of our Worcester Bosch boiler engineers. - Let our boiler repair xepert repair your boiler.
If you have no hot water but the heating works then you have a faulty diverter valve. But, it could also be due to a lack of power, a stuck Y valve, faulty PCB unit, or even a problem with the heating pump. Contact one of our engineers who would be happy to help and solve the problem, Call one of our Worcester Bosch boiler engineers
| Fault/Error Code | Possible Cause |
|---|---|
| A7 | No hot water - Possible airlock or thermostat issues. Also check water levels - Call an boiler repair engineer. |
| A281 or EA 338 | BOILER LEAK - Possible boiler leak, get this repaired ASAP. |
| A41 | Kettling - Kettling or banging sounds from the boiler is generally caused by limescale buildup or issues with your thermostat. Get this checked. |
| 9A 362 | Error - Incorrect Heat Control Module (HCM) fitted or communication issue. |
| 9U 233 | Error - Heat Control Module Error. Code plug problem or communication issue. |
| B7 257 | Internal error - (PCB) Possible control board problem. Printed circuit board (PCB) failure. |
| C6 215 | Fan problem - PCB detected the fan is running too fast. |
| C7 214 | Fan problem - PCB detected the fan is not running. |
| D1 240 | Sensor error - Return sensor may be wet or damaged. |
| E2 222 | Sensor error - Flow sensor short circuit error. |
| E5 218 | Temperature - Flow temperature too high. |
| E9 219 | Sensor error - Temperature too high, sensor short circuit or open circuit. |
| EA 227 | No flame - flame signal loss during operation. |
| F0 237 | Internal error - Internal error. |
| F7 228 | Flame error - False flame or flame detected before burner started. The flame sensor senses flame by passing a small electric current. Error. |
| FA 306 | Flame error - False flame fault – flame detected after burner stop. |
| FD 231 | Mains power fault - Electrical power interruption. |
| FA 364 | Gas valve leak - EV2 leak test failed. Gas valve leak. |
| FB 365 | Gas valve leak - EV2 leak test failed. Gas valve leak. |
| A1 281 | Pump fault - Pump stuck or running with air in the system |
| C1 264 | Airflow error - Airflow stopped during operation. |
| C4 273 | Airflow error - Airflow present during last 24 hour. |
| D1 240 | Sensor error - Return sensor short circuit. |
| D4 271 | Temperature fault - Temperature difference between flow and safety sensor exceeds limit. |
| E9 224 | Overheat - Max thermostat activated – flue gas thermostat overheat. Blockage on pipe/filter or faulty pump. |
| EA 227 | Ignition - No ionisation detected after ignition. |
| EF 349 | Central heating - Central heating boil detected – boiler operating at minimum burner load with temperature difference greater than 18°C between Flow and Return. |
| 212 | Temperature - Safety or flow temperature rising too fast. |
THS Plumbing & Heating Northampton
3 Sunningdale Close
Northampton
NN2 7LR
Tel: 01604 212732
Open: Monday-Sunday 7:30am - 10:00pm