Worcester Bosch Boiler Error & Fault Codes

Worcester Bosch Boiler guide by THS Plumbing & Heating Northampton

Most popular Worcester Bosch Boiler Faults.

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.

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.

Worcester Bosch CDi Compact Combi, Greenstar 25/30 - 27/30 Boiler & System Boiler Fault/Error Codes.

Fault/Error CodePossible Cause
9A 362Error - Incorrect Heat Control Module (HCM) fitted or communication issue.
9U 233Error - Heat Control Module Error. Code plug problem or communication issue.
B7 257Internal error - (PCB) Possible control board problem. Printed circuit board (PCB) failure.
C6 215Fan problem - PCB detected the fan is running too fast.
C7 214Fan problem - PCB detected the fan is not running.
D1 240Sensor error - Return sensor may be wet or damaged.
E2 222Sensor error - Flow sensor short circuit error.
E5 218Temperature - Flow temperature too high.
E9 219Sensor error - Temperature too high, sensor short circuit or open circuit.
EA 227No flame - flame signal loss during operation.
F0 237Internal error - Internal error.
F7 228Flame error - False flame or flame detected before burner started. The flame sensor senses flame by passing a small electric current. Error.
FA 306Flame error - False flame fault – flame detected after burner stop.
FD 231Mains power fault - Electrical power interruption.
FA 364Gas valve leak - EV2 leak test failed. Gas valve leak.
FB 365Gas valve leak - EV2 leak test failed. Gas valve leak.
A1 281Pump fault - Pump stuck or running with air in the system
C1 264Airflow error - Airflow stopped during operation.
C4 273Airflow error - Airflow present during last 24 hour.
D1 240Sensor error - Return sensor short circuit.
D4 271Temperature fault - Temperature difference between flow and safety sensor exceeds limit.
E9 224Overheat - Max thermostat activated – flue gas thermostat overheat. Blockage on pipe/filter or faulty pump.
EA 227Ignition - No ionisation detected after ignition.
EF 349Central heating - Central heating boil detected – boiler operating at minimum burner load with temperature difference greater than 18°C between Flow and Return.
212Temperature - Safety or flow temperature rising too fast.

Worcester Bosch Boiler leaking?

Is your Worcester Bosch boiler leaking? Our boiler engineers can fix this leak, you need to contact our Worcester Bosch engineer or Call us.

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