Worcester Bosch Customer Services 0844 385 1250

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 customer service helpline number
Industry

Best calling hours
Mon-Fri
09:00-18:00 GMT
Main Address
Head Office
Worcester
Bosch Group
Cotswold Way
Warndon
Worcester
WR4 9SW

Worcester Boiler Error Codes

Listed below is a list of the most common fault codes most Worcester / Worcester Bosch Greenstar Boilers.

The alpha numeric code on your boiler indicates the one of the following faults

Error Code Probable cause
EA A Failure of 4 ignition attempts has occured. The boiler then suspends for 30 seconds before a further attempts are made.
EA The pilot light has been extinguished.

This could be caused by;

  • Moisture has entered the sump due to a blocked condensate trap
  • Liquid has collected in the basin.
  • Strong wind have entered the flue and extinguished the pilot light
EA Gas valve coil has broken or disconnected
EA The Pilot light has not established during the first 4 seconds ignition period
EA There is a problem where the pump is not detecting water – Check the pressure gauge and re pressurise to the green area or 1 bar.
9A The Wrong HCM unit has been fitted
9U Problem with the code plug.  The plug might be faulty or
B7 Replace control board
C6 The fan is either;

  • Running too fast
  • Running too slow
C7 Fan not running / Fan not running or airflow blocked
D1 Sensor wet or damaged (the boiler will block for 300 seconds before this condition)
D1 Sensor disconnected or damaged (the boiler will block for 300 seconds before this condition)
D1 Boiler overheating problem
E2 Flow sensor had been shorted or damaged
E2 Flow sensor dysfunctional or damaged
E5 The Primary flow sensor has overheated
E9 The heat exchanger has overheated.
This temperature usually exceeds 105°C
E9 Maximum temperature sensor on the primary heat exchanger has stopped functioning
E9 If the heat exchanger is new, the fault may be that the heat exchanger has not been recognised
E9 The flue gas thermostat has overheated
Model Type Dimensions Maximum Flow Rate Output Efficiency Rating Typical Price
Greenstar 12Ri Regular H – 600 mm

W – 390 mm

D – 270 mm

N/A 12 kW A 90% and above £759.15
Greenstar 24i Junior Combi H – 710 mm

W – 400 mm

D – 330 mm

9.8 l/min 24 kW A 90% and above £767.39
Greenstar 15Ri Regular H – 600 mm

W – 390 mm

D – 270 mm

N/A 15 kW A 90% and above £777.65
Greenstar 12i System System H – 710 mm

W – 400 mm

D – 330 mm

N/A 12 kW A 90% and above £824.13
Greenstar 18Ri Regular H – 600 mm

W – 390 mm

D – 270 mm

N/A 18 kW A 90% and above £838.47
Greenstar 25Si Combi H – 710 mm

W – 400 mm

D – 330 mm

10.2 l/min 25 kW A 90% and above £851.9
Greenstar 15i System System H – 710 mm

W – 400 mm

D – 330 mm

N/A 15 kW A 90% and above £853.78
Greenstar 28i Junior Combi H – 710 mm

W – 400 mm

D – 330 mm

11.4 l/min 28 kW A 90% and above £854.88
Greenstar 24Ri Regular H – 600 mm

W – 390 mm

D – 270 mm

N/A 24 kW A 90% and above £877.49
Greenstar 18i System System H – 710 mm

W – 400 mm

D – 330 mm

N/A 18 kW A 90% and above £888.72
Greenstar 24i System System H – 710 mm

W – 400 mm

D – 330 mm

N/A 24 kW A 90% and above £930.08
Greenstar 30Si Combi H – 710 mm

W – 400 mm

D – 330 mm

12.3 l/min 30 kW A 90% and above £952.64
Greenstar 28CDi Compact Combi H – 680 mm

W – 390 mm

D – 280 mm

11.4 l/min 28 kW A 90% and above £973.44
Greenstar 29CDi Classic Combi H – 760 mm

W – 440 mm

D – 360 mm

12.3 l/min 29 kW A 90% and above £1018.8
Greenstar 30CDi Classic Regular Regular H – 760 mm

W – 440 mm

D – 360 mm

14.3 l/min 34 kW A 90% and above £1062.46
Greenstar 30CDi Classic System System H – 760 mm

W – 440 mm

D – 360 mm

14.3 l/min 30 kW A 90% and above £1062.46
Greenstar 34CDi Classic Combi H – 760 mm

W – 440 mm

D – 360 mm

14.3 l/min 34 kW A 90% and above £1062.46
Greenstar 32CDi Compact Combi H – 680 mm

W – 390 mm

D – 280 mm

13.1 l/min 32 kW A 90% and above £1085.76
Greenstar 36CDi Compact Combi H – 680 mm

W – 390 mm

D – 280 mm

14.7 l/min 36 kW A 90% and above £1204.32
Greenstar 38CDi Classic Combi H – 760 mm

W – 440 mm

D – 360 mm

16.4 l/min 38 kW A 90% and above £1274.21
Greenstar 40CDi Classic Regular Regular H – 760 mm

W – 440 mm

D – 360 mm

N/A 40 kW A 90% and above £1363.85
Greenstar FS 30CDi Regular Regular H – 850 mm

W – 400 mm

D – 600 mm

N/A 30 kW A 90% and above £1398.39
Greenstar 42CDi Classic Combi H – 760 mm

W – 440 mm

D – 360 mm

17.1 l/min 42 kW A 90% and above £1435.01
Greenstar Highflow 440CDi Combi H – 850 mm

W – 600 mm

D – 600 mm

20 l/min 29 kW A 90% and above £1710.16
Greenstar FS 42CDi Regular Regular H – 850 mm

W – 400 mm

D – 600 mm

N/A 42 kW A 90% and above £1847.1
Greenstar Highflow 550CDi Combi H – 850 mm

W – 600 mm

D – 600 mm

14.3 l/min 30 kW A 90% and above £2033.58