Worcester Bosch Greenstar 4000 (before May 2021)

200 Boiler in heating mode 201 Boiler in hot water mode 202 Boiler in anti-cycle mode 203 Boiler in standby, no heat energy demand 204 Current prim. water temp. higher than set val. 208 Chimney sweep demand 214 Fan shut down during safety time 224 Maximal flue gas thermostat or heat exchanger maximal thermostat has activated 224 Maximal flue gas thermostat or heat exchanger maximal thermostat has activated 227 No flame signal after ignition 228 Flame signal without flame present 232 Boiler locked by external switching contact 233 Boiler identification module or device electronics faulty 234 Gas valve electrical fault 235 Conflicting versions of boiler electr. and boiler identification 237 System fault 238 Boiler electronics faulty 242 Boiler electr. system fault 245 System fault boiler electronics / basic controller 249 System fault boiler electronics / basic controller 250 System fault boiler electronics / basic controller 251 System fault boiler electronics / basic controller 252 System fault boiler electronics / basic controller 253 System fault boiler electronics / basic controller 254 System fault boiler electronics / basic controller 258 System fault boiler electronics / basic controller 259 System fault boiler electronics / basic controller 262 System fault boiler electronics / basic controller 263 System fault boiler electronics / basic controller 265 Heat demand lower than energy supplied 268 Relay test was activated 269 Flame monitoring 273 Operation of burner and fan interrupted 281 Operation of burner and fan interrupted 283 Burner starting 284 Opening air/gas ratio control valve/oil solenoid valves 305 Boiler in hot water anti-cycle mode 306 Flame signal after closing the fuel supply 353 Test non-volatile lockout 357 Flame signal after closing the fuel supply 358 Anti-seizing functn. active 360 System fault boiler electronics / basic controller 362 Boiler identification module or boiler electronics faulty 363 System fault boiler electronics / basic controller 810 Hot water remains cold 811 Hot water heating: thermal disinfection failed 1010 No communication via EMS BUS connection 1013 Max. combustion point reached 1017 System pressure too low 1018 Maintenance interval expired 1019 Incorrect pump type detected 1021 Cylinder charging or hot water temperature sensor faulty 1022 Cylinder temp. sensor faulty or contact problems 1023 Maximum run time including standby time reached 1037 Outside temp. sensor faulty - heating back-up operation active 1065 System pressure sensor faulty or not connected 1068 Outside temp. sensor or lambda probe faulty. 1070 Maintenance is due on <dd.mm.yyyy> please call your service engineer 1071 Maintenance is now due please call your service engineer 1072 Maintenance is overdue please call your service engineer 1073 Short-circuit at flow temp. sensor 1074 No signal from flow temperature sensor 1075 Heat exchanger temp sensor short circuit 1076 Heat exchanger temp sensor disconnected 2085 Internal fault 2908 System fault boiler electronics / basic controller 2910 Fault in flue system 2914 Boiler electr. system fault 2915 Boiler electr. system fault 2916 Boiler electr. system fault 2920 Fault in flame monitoring 2923 Boiler electr. system fault 2927 Boiler electr. system fault 2928 Internal fault 2931 System fault boiler electronics / basic controller 2940 System fault burner control unit 2946 Incorrect code plug detected 2948 No flame signal with low output 2949 No flame signal with high output 2950 No flame signal following starting procedure 2951 Loss of flame too many times 2952 Internal fault when testing the ionisation signal 2957 Boiler electr. system fault 2961 No fan signal available 2962 No fan signal available 2963 The heat exchanger sensor or both supply and heat exchanger sensors are defect 2964 Flow rate in heat exchanger too low 2965 Flow temperature too high 2966 Flow temperature rise in heat exchanger too rapid 2967 The temperature difference between supply temperature sensor and temperature sensor at heat exchanger is too large 2970 Pressure drop in heating system too rapid 2971 System pressure too low 2972 Mains voltage too low 3071 Comfort + II RF