Error codes for Viessmann
50 verified manufacturer-referenced Viessmann error codes, model scope and safe checks. Model applicability is limited to manufacturer documentation.
10Viessmann Gas boiler 10: Outdoor temperature sensor short circuitViessmann · Gas boiler→18Viessmann Gas boiler 18: Outdoor temperature sensor circuit openViessmann · Gas boiler→19Viessmann Gas boiler 19: Wireless outdoor temperature sensor communication lostViessmann · Gas boiler→20Viessmann Gas boiler 20: System flow temperature sensor short circuitViessmann · Gas boiler→28Viessmann Gas boiler 28: System flow temperature sensor circuit openViessmann · Gas boiler→30Viessmann Gas boiler 30: Boiler water temperature sensor short circuitViessmann · Gas boiler→38Viessmann Gas boiler 38: Boiler water temperature sensor circuit openViessmann · Gas boiler→40Viessmann Gas boiler 40: Heating circuit 2 flow sensor short circuitViessmann · Gas boiler→44Viessmann Gas boiler 44: Heating circuit 3 flow sensor short circuitViessmann · Gas boiler→50Viessmann Gas boiler 50: Hot-water cylinder temperature sensor short circuitViessmann · Gas boiler→92Viessmann Gas boiler 92: Solar collector temperature sensor short circuitViessmann · Gas boiler→93Viessmann Gas boiler 93: Solar return sensor short circuitViessmann · Gas boiler→94Viessmann Gas boiler 94: Solar cylinder temperature sensor short circuitViessmann · Gas boiler→98Viessmann Gas boiler 98: Solar control temperature sensor open circuitViessmann · Gas boiler→1AViessmann Gas boiler 1A: Left flow sensor faultViessmann · Gas boiler→1BViessmann Gas boiler 1B: Right flow sensor faultViessmann · Gas boiler→1FViessmann Gas boiler 1F: Excessive differential flow rateViessmann · Gas boiler→4CViessmann Gas boiler 4C: Heating circuit 3 flow sensor open circuitViessmann · Gas boiler→9AViessmann Gas boiler 9A: Solar collector sensor open circuitViessmann · Gas boiler→9CViessmann Gas boiler 9C: Solar cylinder temperature sensor open circuitViessmann · Gas boiler→9EViessmann Gas boiler 9E: Low solar circuit flow or temperature limiter tripViessmann · Gas boiler→9FViessmann Gas boiler 9F: Solar controller or Vitosolic module faultViessmann · Gas boiler→A3Viessmann Gas boiler A3: Flue gas temperature sensor incorrectly positionedViessmann · Gas boiler→A4Viessmann Gas boiler A4: System pressure above permitted limitViessmann · Gas boiler→A7Viessmann Gas boiler A7: Programming unit faultViessmann · Gas boiler→B0Viessmann Gas boiler B0: Flue gas temperature sensor short circuitViessmann · Gas boiler→B1Viessmann Gas boiler B1: Programming unit communication faultViessmann · Gas boiler→B5Viessmann Gas boiler B5: Controller internal faultViessmann · Gas boiler→B7Viessmann Gas boiler B7: Boiler coding card faultViessmann · Gas boiler→B8Viessmann Gas boiler B8: Flue gas temperature sensor open circuitViessmann · Gas boiler→BAViessmann Gas boiler BA: Heating circuit 2 mixer extension communication faultViessmann · Gas boiler→BBViessmann Gas boiler BB: Heating circuit 3 mixer extension communication faultViessmann · Gas boiler→BCViessmann Gas boiler BC: Vitotrol heating circuit 1 remote communication faultViessmann · Gas boiler→C1Viessmann Gas boiler C1: EA1 extension communication faultViessmann · Gas boiler→C2Viessmann Gas boiler C2: Solar controller communication faultViessmann · Gas boiler→C3Viessmann Gas boiler C3: AM1 extension communication faultViessmann · Gas boiler→C4Viessmann Gas boiler C4: OpenTherm extension communication faultViessmann · Gas boiler→C5Viessmann Gas boiler C5: KM-BUS variable-speed pump communication faultViessmann · Gas boiler→E3Viessmann Gas boiler E3: Insufficient heat transfer during calibrationViessmann · Gas boiler→E4Viessmann Gas boiler E4: 24V supply voltage faultViessmann · Gas boiler→E5Viessmann Gas boiler E5: Flame amplifier faultViessmann · Gas boiler→EBViessmann Gas boiler EB: Repeated flame loss during calibrationViessmann · Gas boiler→ECViessmann Gas boiler EC: Calibration parameter faultViessmann · Gas boiler→EDViessmann Gas boiler ED: Internal controller faultViessmann · Gas boiler→F0Viessmann Gas boiler F0: Burner locked due to internal controller faultViessmann · Gas boiler→F1Viessmann Gas boiler F1: Flue gas temperature limit exceededViessmann · Gas boiler→F2Viessmann Gas boiler F2: Boiler temperature limiter triggeredViessmann · Gas boiler→F6Viessmann Gas boiler F6: Large difference between boiler temperature sensorsViessmann · Gas boiler→F8Viessmann Gas boiler F8: Fuel valve closes too lateViessmann · Gas boiler→FFViessmann Gas boiler FF: Internal fault or reset button blockedViessmann · Gas boiler→