Bosch Combi Boiler Error Codes
Bosch Greenstar boilers display codes as a letter/number pair, often with a sub-code. Note both parts of the code from the display before calling.
This is not a DIY repair
Combi boilers are gas-fired appliances regulated under the BC Safety Standards Act. Opening the unit, touching the gas valve, or working on the flue without a valid BC gas-fitter licence is both unsafe and illegal. Diagnosing the fault is helpful — fixing it should always be left to a certified technician.
Call 778-909-5731Bosch fault codes (17)
EA 227UrgentNo flame detected during ignition or operation.E9 219UrgentHigh-limit / overheat safety temperature exceeded.F7 268UrgentFalse flame signal detected.FA 252UrgentFlame detected after gas valve closed.FD 257ModerateReset button pressed too often / system fault.C6 224UrgentFan speed fault.E2 215ModerateFlow temperature sensor (NTC) fault.E5 222UrgentFlow NTC over-temperature.A1 218ModerateLow water / pump or low pressure fault.A7 286ModerateDHW temperature sensor fault.CE 207ModerateSystem pressure too low.d3 216ModerateExternal safety/limit thermostat open.E1 212ModerateInternal control fault.Eb 213UrgentFlame lost during operation.F0 230ModerateInternal fault — control unit.H07LowHeating system pressure low (service notice).F0ModerateGeneral internal control fault.