Viessmann Boiler Error Codes

Viessmann Boiler Error Codes

Vitodens 200 Boiler Error Codes

Listed below are some Error Codes that could appear on the Viessmann Vitodens 200 gas boiler.

Fault CodeSystem BehaviourCause of Problem
02Burner control switches to lockoutSafety chain was activated
04, 05, 06, 08Burner control switches to lockoutFan speed too high/low at start
07, 09Burner control switches to lockoutBasic level of air pressure threshold in standby mode not correct
0ABurner control switches to lockoutFault, fan speed
0DBurner control switches to lockoutReset button pressed repeatedly or while burner is running
1A, 1BBurner blockedFlow sensor 1, 2 Faulty
1FBurner blockedDifferential flow rate too large
25Boiler operates with high boiler water temperatureEmissions test switch turned to “hand symbol” for 30 minutes already
26Boiler operates with continuous relay testSetting mode for maximum or minimum rated input active for 30 minutes already
35Boiler does not activateReset button (pressed while burner is OFF) with Emissions test switch turned to “hand symbol”
A2N/AKM-BUS fault to Vitocom
A5N/AShort circuit / open circuit

Fault Code 0B

Error Code 0B on a Viessmann boiler.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200Burner control switches to lockout. Fan does not idle after auto reset (incorrect fan rpm).Severe wind conditions in vent system
Vitodens 100-WBurner blockedInsufficient water flow. Incorrect flow direction. Defective flow switch.

Fault Code 0C

Error Code 0C.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 100-WBurner blockedInsufficient power supply
Vitodens 200Burner control switches to lockoutFlame signal still present after switching off

Fault Code 0F

Error Code 0F.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 222-FControl modeCode “0F” is only displayed in the fault history
Vitotronic 300 / Vitotronic 300-K, with Vitotronic 300 / Vitodens 200-W / Vitocontrol-S, with Vitotronic 100Control mode / Controlled operationService required. “0F” is only displayed in the fault history.
Vitotronic 200 / 300Normal operationService required
Vitocontrol-S, MW1 with Vitotronic 100 / Vitotronic 300-K, MW1S with Vitotronic 100Control modeMaintenance “0F” is only displayed in the fault history

Fault Code 10

 Error Code 10.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200-W / 222-F / Vitotronic 300 / 200/ 200-H / 050/200-H / 300-K / vitocontrol-SBoiler operates based on outdoor temperature of 32°F / 0°CShort circuit – Outdoor temperature sensor
Vitotronic 300-K, MW2S with Vitotronic 100 / Vitodens 100-W (combiPLUS) / 200-w / Vitocontrol-S, WB2B with Vitotronic 100Controls as if the outdoor temperature / Constant ModeOutdoor temperature sensor shorted out

Fault Code 10, 14, F3, and F4

Error Code 10, 14, F3, and F4.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200Burner control switches to lockoutNo flame signal is present

Fault Code 18 and D1

Error Code 18 and D1.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 100 / 200-W / 222-F / Vitotronic 300-K With 100 / Vitocontrol-SBoiler operates based on outdoor temperature of 32°F / 0°C / Constant ModeOutdoor temperature sensor cable broken
Vitotronic / 100 / 200 / 300 / 050/200-H /300-K / Vitocontrol-S, MW1 with Vitotronic 100Operates on basis of 32°F / 0°C outdoor temperatureOpen circuit – Outdoor temperature sensor
Vitotronic 200-H / Vitotronic 300-K, MW1B with Vitotronic 300 / Vitotronic 300-K, MW2B with Vitotronic 200Controls as if the outdoor temperatureLead break, Outdoor temperature sensor
Vitotronic 050/200-HActivates after 0°C / 32°F outdoor temperatureCable break – Outdoor temperature sensor
Vitodens 100-WBurner in fault modeDIP switch S2 is set to “ON”

Fault Code 19

Error Code 19.

Boiler ModelSystem BehaviourCause of Problem
Vitotronic 300Activates after 0°C / 32°F outdoor temperatureCommunication fault, Wireless Outdoor temperature sensor

Fault Code 20

Error Code 20.

Boiler ModelSystem BehaviourCause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 300 / 300-K / 200 / 100Stand-alone control unit without supply temperature sensor (possibly supply temperature not high enough)short circuit – Common supply temperature sensor
Vitocontrol-S with Vitotronic 100 / Vitotronic 300-K, with Vitotronic 200Vitocontrol-S, controls in a stand-alone manner w/o supply temperature sensor (supply temperature may not be high enough)Common supply temperature sensor shorted out
Vitocrossal 300Regulates without supply temperature sensor (low-loss header)Short circuit – System Flow temperature sensor
Vitodens 200-W / 222-FRegulates without supply temperature sensor (low-loss header)Short circuit – System supply temperature sensor
Vitotronic 050/200-H< / 200 / 200-H / 300Mixing valve closes/ closedShort circuit – Supply temperature sensor / mixing valve circuit M1
Vitotronic 300-K, with Vitotronic 100Vitotronic 300-K, MW1S controls in a stand-alone manner w/o strap-on sensor (supply temperature may not be high enough)Short circuit – Strap-on temperature sensor
Vitodens 200-WRegulates without supply temperature sensor (low-loss header)System supply temperature sensor shorted out

Fault Code 21

Error Code 21.

Boiler ModelSystem BehaviourCause of Problem
Vitotronic 200 / 300operation without influence of return water temperatureShort circuit – Return water temperature sensor

Fault Code 28

Error Code 28.

Boiler ModelSystem BehaviourCause of Problem
Vitocontrol-S with Vitotronic 100Vitocontrol-S, VD2/CT3/CM2 controls in a stand-alone manner w/o supply temperature sensor (supply temperature may not be high enough)Open circuit – Common supply temperature sensor
Vitocontrol-S with Vitotronic 100 / Vitotronic 300-K,with Vitotronic 100Vitocontrol-S, WB2B controls in a stand-alone manner w/o supply temperature sensor (supply temperature may not be high enough)Common supply temperature sensor cable broken
Vitocrossal 300 / Vitodens 200-W / 22-FRegulates without supply temperature sensor (low-loss header)System supply temperature sensor cable broken
Vitotronic 050/200-HMixing valve closesCable break – Supply temperature sensor
Vitotronic 050/200-HMixing valve is closedOpen circuit – Supply temperature sensor of mixing valve circuit M1
Vitotronic 200-H / Vitotronic 200 / 300Mixing valve is being closedLead break, Supply temperature sensor, heating circuit with mixing valve M1 (heating circuit 1)
Vitotronic 300 Vitotronic / 300-K with Vitotronic 300 / 200Stand-alone control unit without supply temperature sensor (possibly supply temperature not high enough)Lead break, Common supply temperature sensor
Vitotronic 300-K with Vitotronic 100Vitotronic 300-K, MW1S controls in a stand-alone manner w/o strap-on sensor (supply temperature may not be high enough)Open circuit – Strap-on temperature sensor

Fault Code 29, 41, 49, F80, F81, F83, F88 and F89

Error Code 29, 41, 49, F80, F81, F83, F88 and F89.

Boiler ModelSystem BehaviourCause of Problem
Vitotronic 200 / 300Normal operation without influence of return water temperatureOpen circuit 1 or 2 – Return water temperature sensor (of mixing valve circuit 1)

Fault Code 30

Error Code 30.

Boiler ModelSystem BehaviourCause of Problem
Vitocontrol-S, with Vitotronic 100 / Vitocrossal 300 / Vitodens 200-W / 222-F / Vitotronic 100 / 200 / 300Burner is started and stopped via an adjustable high limitShort circuit – Boiler water temperature sensor
Vitocontrol-S with Vitotronic 100 / Vitodens 100-W (CombiPLUS)/ 200-1Burner blockedBoiler water temperature sensor shorted out

Fault Code 38

Error Code 38.

Boiler ModelSystem BehaviourCause of Problem
Vitodens – 200-W / 222-F / COMBIPLUSBurner blockedBoiler water temperature sensor cable broken
Vitotronic 100 / 200 / 300 / Vitocontrol-S with Vitotronic 100Burner is switched on and off by the adjustable high limitOpen circuit – Boiler temperature sensor
Vitotronic 300-K with Vitotronic 300 / Vitotronic 300-K with Vitotronic 300The burner is started and stopped via a temperature controllerLead break, Boiler water temperature sensor
Vitodens 100-WBurner blockedBoiler water temperature sensor lead broken

Fault Code 40 And 44

Error Code 40 and 44.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersMixing valve closesHeating circuit 2 with mixing valve supply short circuit on temperature sensor

Fault Code 41

Error Code 41.

Boiler ModelSystem BehaviourCause of Problem
Vitotronic 300Operation without accounting for return water temperatureShort circuit – Return water temperature sensor of mixing valve circuit 2

Fault Code 48 and 4C

Error Code 48 and 4C.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersMixing valve closes / ClosedHeating circuit 2 with mixing valve supply temperature sensor cable broken / open circuit

Fault Code 50, 51, 58 and 59

Error Code 50, 51, 58 and 59.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200-W / 222-FNo DHW heating/ Fault with DHWShort circuit/open circuit – DHW tank temperature sensor or lead break

Fault Code 52

Error Code 50 and 51.

Boiler ModelSystem BehaviourCause of Problem
Vitotronic 300Control modeShort circuit – Supply temperature sensor low-loss header
Vitodens 100-W CombiPLUSBurner blocked (with CombiPLUS only)Flow sensor shorted out (in CombiPLUS)

Fault Code 55, 56 and 57

Error Code 55, 56 and 57.

Boiler ModelSystem BehaviourCause of Problem
Vitotronic 300-K, with Vitotronic 200Control modeMaintenance or error on Vitotronic 100 of boiler 5-8

Fault Code 5A, B7, and B8

Error Code 5A, B7, and B8.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersControl modeLead break, low-loss header Supply temperature sensor
All Viessmann boilersBurner blocked / control modesensor cable broken

Fault Code 5C, 5D, 5E and 5F

Error Code 5C, 5D, 5E and 5F.

Boiler ModelSystem BehaviourCause of Problem
Vitotronic 300-K with Vitotronic 200Control modeCommunication fault, Vitotronic 100 of boiler 5-8

Fault Code 60, 68, 70, 78, BD, BE and BF

Error Code 60, 68, 70, 78, BD, BE and BF.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilers– No output reduction 
– Return control Open  
– Boiler with maximum temperatureShort/open circuit – Temperature sensor [17A] 

Fault Code 80, 81, 82, 83 and FD

Error Code 80, 81, 82, 83 and FD.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBurner control unit in a fault state; system cools down; burner control unit locked outShort circuit – Boiler water temperature sensor, burner control unit

Fault Code 88, 89, and E6

Error Code 88, 89, and E6.

Boiler ModelSystem BehaviourCause of Problem
Vitotronic 300Burner control unit in a fault stateLead break, Boiler water temperature sensor, burner control unit

Fault Code 8C, 8D, 8E and 8F

Error Code 8C, 8D, 8E and 8F.

Boiler ModelSystem BehaviourCause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 300-K with Vitotronic 100 / 200Control modeCommunication fault, Vitotronic 100 of boiler 1-4

Fault Code 90, 91, 92, 93, 94, 98, 99, 9A, 9B , 9C, 9E, 9F and AB

Error Code 90, 91, 92, 93, 94, 98, 99, 9A, 9B , 9C 9E, 9F and AB.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersControl modeShort circuit – Temperature sensor [5] / [6] / [7] / [10]

Fault Code A3, B0, F1, FE1 and FE2

Error Code A3, B0, F1, FE1 and FE2.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBurner blockedFlue gas temperature sensor not properly positioned / Check Sensor

Fault Code A4

Error Code A4.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200Pump runs at maximum speedOpen circuit – BUS connection with variable speed heating circuit pump

Fault Code A7

Error Code A7.

Boiler ModelSystem BehaviourCause of Problem
Vitocrossal 300 / Vitodens 200-W / 222-F / 300Control mode (stays in factory default setting)Faulty Programming unit

Fault Code A8

Error Code A8.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 222-FBurner blocked. The venting program is started automaticallyAir lock in the Internal circulation pump or minimum flow rate not achieved

Fault Code A9, BA, BB, BC and FE0

Error Code A9, BA, BB, BC and FE0.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersControl ModeCommunication error

Fault Code AD

Error Code AD.

Boiler ModelSystem BehaviourCause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / Vitotronic 300-K with Vitotronic 300Control modeIsolation valve configuration error: Coding OC:2, OC:3 or OC:4 set, and coding 4E:1 not set

Fault Code B1

Error Code B1.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersControl modeCommunication error, Programming unit

Fault Code B2

Error Code B1.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200Boiler cools downSensor inputs are not read correctly

Fault Code B3 and E5

Error Code B3 and E5.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200Setting via service level not possibleData points are not stored; internal fault VR20

Fault Code B4

Error Code B4.

Boiler ModelSystem BehaviourCause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / 200 / 300 / Vitotronic 300-K with Vitotronic 100Emissions test modeInternal electronics fault
Vitocontrol-S with Vitotronic 100 / Vitodens 200-WRegulates as if the outside temperature was 32°F (0°C)Internal fault
Vitotronic 050/200-HUndefined control characteristicsInternal electronics fault

Fault Code B5

Error Code B5.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersControl modeInternal electronics fault

Fault Code B6

Error Code B6.
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Boiler ModelSystem BehaviourCause of Problem
Constant modeInvalid hardware recognised 

Fault Code B9, ED, F0, FE5, FEC, FED, FEE, FEF, FFD and FFF

Error Code B9, ED, F0, FE5, FEC, FED, FEE, FEF, FFD and FFF.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersNormal operation / fault around burner control unitInternal fault

Fault Code C1

Error Code C1.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersControl ModeExternal safety equipment

Fault Code C2-C8, CD-CF, D2-D8, DA-DF, and E0

Error Codes C2, C3, C4, C5, C6, C7, C8, CD, CE, CF, D2, D3, D6, D7, D8, DA, DB, DC, DD, DE, DF and E0.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersControl modeOpen circuit – KM BUS to solar control unit / Extension AM1 / DE1-DE3 M1 / communication fault

Fault Code C9, CA and CB

Error Code C9, CA and CB.

Boiler ModelSystem BehaviourCause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / 300 / Vitotronic 300-K with Vitotronic 300Boiler cools downError: Maximum pressure limiter 1 2

Fault Code CC and F0

Error Code CC and F0.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200Burner control unit switches to lockout (due to large line voltage fluctuations)Differential air pressure sensor / open circuit

Fault Code D4

Error Code D4.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBoiler cools downFixed high limit has responded or fuse F2 has blown.

Fault Code D5

Error Code D5.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBoiler drives up to electronic maximum limitBoiler does not log in at the cascade control unit

Fault Code E1, E7, E8, E9, EA, EB, EC and FF2

Error Code E1, E7, E8, E9, EA, EB, EC and FF2.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBurner in fault modeIonization current too high during calibration

Fault Code E2 and E3

Error Code E2 and E3.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 200-W / 222-F / Vitotronic 300Burner in fault modeHeating water flow rate too low during calibration; flow switch caused shutdown

Fault Code E4

Error Code E4.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBurner blockedFault, supply voltage 24V

Fault Code EE and EF

Error Code EE and EF.

Boiler ModelSystem BehaviourCause of Problem
Vitocontrol-S with Vitotronic 100 / Vitocrossal 300 / Vitodens 200-W / 222-F / Vitotronic 300Burner in fault modeAt burner start, flame signal is missing or too weak

Fault Code F5

Error Code F5.

Boiler ModelSystem BehaviourCause of Problem
Vitodens 100-W / 200 / 300 / Vitotronic 300Burner blockedFaulty Air pressure switch

Fault Code F6, 58, F9, FE1, FE2 and FF6

Error Code F6, 58, F9, FE1, FE2 and FF6.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersGas pressure switch shows no gas pressure / Electrical connection faultGas shut-off valve closed; gas pressure switch faulty; multiple problems with gas supply

Fault Code FA and FB

Error Code FA and FB.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBurner in fault mode / Emergency operationFan not at standstill / plug-in connection

Fault Code FC

Error Code FC.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBurner in fault modeGas valve faulty or faulty modulation valve control; or vent system blocked

Fault Code FE

Error Code FE.

Boiler ModelSystem BehaviourCause of Problem
All Viessmann boilersBurner blocked or in fault modeStrong interference (EMC) field nearby, or Faulty main PCB

Fault Code FE4

Error Code FE4.

Boiler ModelSystem BehaviourCause of Problem
Vitocrossal 200Burner shuts downMultiple detection of undervoltage

Fault Code FFA, FFB and FR

Error Code FFA, FFB and FR.

Boiler ModelSystem BehaviourCause of Problem
Vitocrossal 200 / 400-620 / 186-311Fan runs without demand; Burner control unit in a fault stateFan has not stopped; cable [100A] faulty; fan faulty; burner control unit faulty

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