Page 11713 COMBINATION BOILER FAULT FINDINGWARNING: The Combination Boiler fault finding tables (Central Heating and Hot Water) areto only be used by competent and suitably qualified engineers. It may be necessary tocheck live terminals inside the control panel. Extreme care should be taken when doingso.13.1 Error codes displayed on the LCD.Combination Boilers are fitted with diagnostic functions that monitor the correct function ofcertain control systems within the appliance.Error codes are displayed on the LCD, a list of Error codes, their possible causes andcorrective actions are detailed below.Code Description Possible Cause (s) Corrective Action (s)E01 Burner Lockout No fuel supply to burner, air in fuel linesBurner faultConsult Service EngineerE02 High Limit Air Lock in boiler, displaced NTCTemperature Sensor, circulation problemConsult Service EngineerE04 Low SystemPressureSystem not topped up after pressure lossafter bleeding radiators etc.Leak in heating systemCheck system pressure, seeSection 1.3, 1.4 & 1.5 then, checkcorrosion inhibitor concentration.E05 Boiler NTC Error Boiler Flow NTC Temperature Sensorshort circuit or disconnectedConsult Service EngineerE06 DHW Flow NTCErrorDHW Flow NTC Temperature Sensorshort circuit or disconnectedConsult Service EngineerE11* Tank Limit Displaced Tank NTC TemperatureSensor ProbeConsult Service EngineerE12 Tank ControlNTC ErrorTank Control NTC Temperature Sensorshort circuit or disconnectedConsult Service EngineerE15* CH Return NTCErrorCH Return NTC Temperature Sensorshort circuit or disconnectedConsult Service EngineerE22 Flash DataCorruptedPCB Fault Consult Service EngineerE31 Remote ControlCommunicationErrorDamaged Remote Control cableRemote Control FaultConsult Service EngineerE32 MMI - ControlPCB Error (OnRemote Control)Damaged cable in control panelPCB FaultConsult Service EngineerE46 SystemPressureSensor ErrorSystem Pressure Sensor disconnectedSystem Pressure Sensor FaultConsult Service EngineerE48 High SystemPressureFilling Loop left connected, and openInsufficient system expansion capacityConsult Service EngineerE62 MMI - ControlPCB Error (OnBoiler)Damaged cable in control panelPCB FaultConsult Service Engineer
