Worcester Bosch Greenstar I System / Combi Boiler Error Codes

Worcester Bosch Greenstar I System / Combi Boiler Error Codes

Fault Description System Behaviour
226 Service tool has been connected in the blocking error history menu
FD 231 The power has been interrupted during a lockout
C7 214 Fan does not run during the start up phase – fan harness connector needs checking
C6 215 Fan speed too high – check the fan harness and connector
C7 216 Fan speed too low – check the fan harness and connector
C7 217 Fan has stopped during appliance operation
C1 264 Fan stopped during operation
C4 273 Continuous fan operation for the last 24 hours – appliance temporarily blocked
E2 222 Flow temperature sensor shorted
E2 233 Flow temperature sensor disconnected
E9 276 Primary flow temperature exceeded 95°c
E2 350 Flow temperature sensor shorted
E2 351 Flow temperature sensor disconnected
FA 306 Ionisation detected after the gas valve closed
EA 227 No ionisation detected after ignition
F7 228 Isioniation current detected before burner start
EA 229 Loss of ionisation signal during operation
EA 261 Heat control module (HCM) potentially defective – reset the appliance
9U 233 Control box or heat control module (HCM) is defective or loose, the HCM needs to be checked
C4 237 Control box or heat control module (HCM) is defective
F0 238 Gas valve or control box error – gas valve coils need checking
F0 239 Control box or the heat control module (HCM) is defective – the control box connections need checking
F0 242 Control box or the heat control module (HCM) is defective – the HCM and control box connections need to be checked
B7 257 Control box or the heat control module HCM) is defective- the HCM and control box connections need to be checked
F0 258 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
EH 258 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
F1 259 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
F0 262 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
F1 263 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
F0 272 Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing
F0 280 Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing
F0 290 Control box is defective – HCM needs checking as it might not be inserted properly or need replacing
328 Internal error with the mains voltage – frequency may be inconsistent
235 Incompatible heat control module (HCM) software versions – control box needs latest software
356 Low mains voltage – the voltage may be interrupted or inconsistent and needs checking
360 Heat control module (HCM) invalid – the inserted HCM does not correspond with the control box
A8 362 Low mains voltage – the voltage may be interrupted, inconsistent or heat control module (HCM) invalid
CC 800 Outdoor sensor defect available when accessory outdoor sensor is connected
A1 281 Pump stock or running dry
E9 224 Flue or high limit thermostat activated
D4 341 Primary flow temperature rising too fast

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