Boiler Fault Finder

Viessmann Boiler Error Codes

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Vitodens 200 Boiler Error Codes

Listed below are some error codes that could appear on the Viessmann Vitodens 200 gas boiler.

Fault Code System Behaviour Cause of Problem
02 Burner control switches to lockout Safety chain was activated
04, 05, 06, 08 Burner control switches to lockout Fan speed too high/low at start
07, 09 Burner control switches to lockout Basic level of air pressure threshold in standby mode not correct
0A Burner control switches to lockout Fault, fan speed
0D Burner control switches to lockout Reset button pressed repeatedly or while burner is running
1A, 1B Burner blocked Flow sensor 1, 2 Faulty
1F Burner blocked Differential flow rate too large
25 Boiler operates with high boiler water temperature Emissions test switch turned to “hand symbol” for 30 minutes already
26 Boiler operates with continuous relay test Setting mode for maximum or minimum rated input active for 30 minutes already
35 Boiler does not activate Reset button (pressed while burner is OFF) with Emissions test switch turned to “hand symbol”
A2 N/A KM-BUS fault to Vitocom
A5 N/A Short circuit / open circuit

Fault Code 0B

Listed below are the possible faults for the error code 0B on a Viessmann boiler.

Boiler Model System Behaviour Cause of Problem
Vitodens 200 Burner control switches to lockout. Fan does not idle after auto reset (incorrect fan rpm). Severe wind conditions in vent system
Vitodens 100-W Burner blocked Insufficient water flow. Incorrect flow direction. Defective flow switch.

Fault Code 0C

Listed below are the possible faults for the error code 0C.

Boiler Model System Behaviour Cause of Problem
Vitodens 100-W Burner blocked Insufficient power supply
Vitodens 200 Burner control switches to lockout Flame signal still present after switching off

Fault Code 0F

Listed below are the possible faults for the error code 0F.

Boiler Model System Behaviour Cause of Problem
Vitodens 222-F Control mode Code ”0F” is only displayed in the fault history
Vitotronic 300 / Vitotronic 300-K, with Vitotronic 300 / Vitodens 200-W / Vitocontrol-S, with Vitotronic 100 Control mode / Controlled operation Service required. ”0F” is only displayed in the fault history.
Vitotronic 200 / 300 Normal operation Service required
Vitocontrol-S, MW1 with Vitotronic 100 / Vitotronic 300-K, MW1S with Vitotronic 100 Control mode Maintenance ”0F” is only displayed in the fault history

Fault Code 10

 Listed below are the possible faults for the error code 10.

Boiler Model System Behaviour Cause of Problem
Vitodens 200-W / 222-F / Vitotronic 300 / 200/ 200-H / 050/200-H / 300-K / vitocontrol-S Boiler operates based on outdoor temperature of 32°F / 0°C Short circuit – Outdoor temperature sensor
Vitotronic 300-K, MW2S with Vitotronic 100 / Vitodens 100-W (combiPLUS) / 200-w / Vitocontrol-S, WB2B with Vitotronic 100 Controls as if the outdoor temperature / Constant Mode Outdoor temperature sensor shorted out

Fault Code 10, 14, F3, and F4

Listed below are the possible faults for the error code 10, 14, F3, and F4.

Boiler Model System Behaviour Cause of Problem
Vitodens 200 Burner control switches to lockout No flame signal is present

Fault Code 18 and D1

Listed below are the possible faults for the error code 18 and D1.

Boiler Model System Behaviour Cause of Problem
Vitodens 100 / 200-W / 222-F / Vitotronic 300-K With 100 / Vitocontrol-S Boiler operates based on outdoor temperature of 32°F / 0°C / Constant Mode Outdoor temperature sensor cable broken
Vitotronic / 100 / 200 / 300 / 050/200-H /300-K / Vitocontrol-S, MW1 with Vitotronic 100 Operates on basis of 32°F / 0°C outdoor temperature Open circuit – Outdoor temperature sensor
Vitotronic 200-H / Vitotronic 300-K, MW1B with Vitotronic 300 / Vitotronic 300-K, MW2B with Vitotronic 200 Controls as if the outdoor temperature Lead break, Outdoor temperature sensor
Vitotronic 050/200-H Activates after 0°C / 32°F outdoor temperature Cable break – Outdoor temperature sensor
Vitodens 100-W Burner in fault mode DIP switch S2 is set to “ON”

Fault Code 19

Listed below are the possible faults for the error code 19.

Boiler Model System Behaviour Cause of Problem
Vitotronic 300 Activates after 0°C / 32°F outdoor temperature Communication fault, Wireless Outdoor temperature sensor

Fault Code 20

Listed below are the possible faults for the error code 20.

Boiler Model System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 300 / 300-K / 200 / 100 Stand-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 200 Vitocontrol-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 300 Regulates without supply temperature sensor (low-loss header) Short circuit – System Flow temperature sensor
Vitodens 200-W / 222-F Regulates without supply temperature sensor (low-loss header) Short circuit – System supply temperature sensor
Vitotronic 050/200-H< / 200 / 200-H / 300 Mixing valve closes/ closed Short circuit – Supply temperature sensor / mixing valve circuit M1
Vitotronic 300-K, with Vitotronic 100 Vitotronic 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-W Regulates without supply temperature sensor (low-loss header) System supply temperature sensor shorted out

Fault Code 21

Listed below are the possible faults for the error code 21.

Boiler Model System Behaviour Cause of Problem
Vitotronic 200 / 300 operation without influence of return water temperature Short circuit – Return water temperature sensor

Fault Code 28

Listed below are the possible faults for the error code 28.

Boiler Model System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 Vitocontrol-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 100 Vitocontrol-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-F Regulates without supply temperature sensor (low-loss header) System supply temperature sensor cable broken
Vitotronic 050/200-H Mixing valve closes Cable break – Supply temperature sensor
Vitotronic 050/200-H Mixing valve is closed Open circuit – Supply temperature sensor of mixing valve circuit M1
Vitotronic 200-H / Vitotronic 200 / 300 Mixing valve is being closed Lead break, Supply temperature sensor, heating circuit with mixing valve M1 (heating circuit 1)
Vitotronic 300 Vitotronic / 300-K with Vitotronic 300 / 200 Stand-alone control unit without supply temperature sensor (possibly supply temperature not high enough) Lead break, Common supply temperature sensor
Vitotronic 300-K with Vitotronic 100 Vitotronic 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

Listed below are the possible faults for the error code 29, 41, 49, F80, F81, F83, F88 and F89.

Boiler Model System Behaviour Cause of Problem
Vitotronic 200 / 300 Normal operation without influence of return water temperature Open circuit 1 or 2 – Return water temperature sensor (of mixing valve circuit 1)

Fault Code 30

Listed below are the possible faults for the error code 30.

Boiler Model System Behaviour Cause of Problem
Vitocontrol-S, with Vitotronic 100 / Vitocrossal 300 / Vitodens 200-W / 222-F / Vitotronic 100 / 200 / 300 Burner is started and stopped via an adjustable high limit Short circuit – Boiler water temperature sensor
Vitocontrol-S with Vitotronic 100 / Vitodens 100-W (CombiPLUS)/ 200-1 Burner blocked Boiler water temperature sensor shorted out

Fault Code 38

Listed below are the possible faults for the error code 38.

Boiler Model System Behaviour Cause of Problem
Vitodens – 200-W / 222-F / COMBIPLUS Burner blocked Boiler water temperature sensor cable broken
Vitotronic 100 / 200 / 300 / Vitocontrol-S with Vitotronic 100 Burner is switched on and off by the adjustable high limit Open circuit – Boiler temperature sensor
Vitotronic 300-K with Vitotronic 300 / Vitotronic 300-K with Vitotronic 300 The burner is started and stopped via a temperature controller Lead break, Boiler water temperature sensor
Vitodens 100-W Burner blocked Boiler water temperature sensor lead broken

Fault Code 40 And 44

Listed below are the possible faults for the error code 40 and 44.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Mixing valve closes Heating circuit 2 with mixing valve supply short circuit on temperature sensor

Fault Code 41

Listed below are the possible faults for the error code 41.

Boiler Model System Behaviour Cause of Problem
Vitotronic 300 Operation without accounting for return water temperature Short circuit – Return water temperature sensor of mixing valve circuit 2

Fault Code 48 and 4C

Listed below are the possible faults for the error code 48 and 4C.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Mixing valve closes / Closed Heating circuit 2 with mixing valve supply temperature sensor cable broken / open circuit

Fault Code 50, 51, 58 and 59

Listed below are the possible faults for the error code 50, 51, 58 and 59.

Boiler Model System Behaviour Cause of Problem
Vitodens 200-W / 222-F No DHW heating/ Fault with DHW Short circuit/open circuit – DHW tank temperature sensor or lead break

Fault Code 52

Listed below are the possible faults for the error code 50 and 51.

Boiler Model System Behaviour Cause of Problem
Vitotronic 300 Control mode Short circuit – Supply temperature sensor low-loss header
Vitodens 100-W CombiPLUS Burner blocked (with CombiPLUS only) Flow sensor shorted out (in CombiPLUS)

Fault Code 55, 56 and 57

Listed below are the possible faults for the error code 55, 56 and 57.

Boiler Model System Behaviour Cause of Problem
Vitotronic 300-K, with Vitotronic 200 Control mode Maintenance or error on Vitotronic 100 of boiler 5-8

Fault Code 5A, B7, and B8

Listed below are the possible faults for the error code 5A, B7, and B8.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Control mode Lead break, low-loss header Supply temperature sensor
All Viessmann boilers Burner blocked / control mode sensor cable broken

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

Listed below are the possible faults for the error code 5C, 5D, 5E and 5F.

Boiler Model System Behaviour Cause of Problem
Vitotronic 300-K with Vitotronic 200 Control mode Communication fault, Vitotronic 100 of boiler 5-8

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

Listed below are the possible faults for the error code 60, 68, 70, 78, BD, BE and BF.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers – No output reduction  
– Return control Open    
– Boiler with maximum temperature Short/open circuit – Temperature sensor [17A]  

Fault Code 80, 81, 82, 83 and FD

Listed below are the possible faults for the error code 80, 81, 82, 83 and FD.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Burner control unit in a fault state; system cools down; burner control unit locked out Short circuit – Boiler water temperature sensor, burner control unit

Fault Code 88, 89, and E6

Listed below are the possible faults for the error code 88, 89, and E6.

Boiler Model System Behaviour Cause of Problem
Vitotronic 300 Burner control unit in a fault state Lead break, Boiler water temperature sensor, burner control unit

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

Listed below are the possible faults for the error code 8C, 8D, 8E and 8F.

Boiler Model System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 300-K with Vitotronic 100 / 200 Control mode Communication fault, Vitotronic 100 of boiler 1-4

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

Listed below are the possible faults for the error code 90, 91, 92, 93, 94, 98, 99, 9A, 9B , 9C 9E, 9F and AB.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Control mode Short circuit – Temperature sensor [5] / [6] / [7] / [10]

Fault Code A3, B0, F1, FE1 and FE2

Listed below are the possible faults for the error code A3, B0, F1, FE1 and FE2.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Burner blocked Flue gas temperature sensor not properly positioned / Check Sensor

Fault Code A4

Listed below are the possible faults for the error code A4.

Boiler Model System Behaviour Cause of Problem
Vitodens 200 Pump runs at maximum speed Open circuit – BUS connection with variable speed heating circuit pump

Fault Code A7

Listed below are the possible faults for the error code A7.

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

Fault Code A8

Listed below are the possible faults for the error code A8.

Boiler Model System Behaviour Cause of Problem
Vitodens 222-F Burner blocked. The venting program is started automatically Air lock in the Internal circulation pump or minimum flow rate not achieved

Fault Code A9, BA, BB, BC and FE0

Listed below are the possible faults for the error code A9, BA, BB, BC and FE0.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Control Mode Communication error

Fault Code AD

Listed below are the possible faults for the error code AD.

Boiler Model System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / Vitotronic 300-K with Vitotronic 300 Control mode Isolation valve configuration error: Coding OC:2, OC:3 or OC:4 set, and coding 4E:1 not set

Fault Code B1

Listed below are the possible faults for the error code B1.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Control mode Communication error, Programming unit

Fault Code B2

Listed below are the possible faults for the error code B1.

Boiler Model System Behaviour Cause of Problem
Vitodens 200 Boiler cools down Sensor inputs are not read correctly

Fault Code B3 and E5

Listed below are the possible faults for the error code B3 and E5.

Boiler Model System Behaviour Cause of Problem
Vitodens 200 Setting via service level not possible Data points are not stored; internal fault VR20

Fault Code B4

Listed below are the possible faults for the error code B4.

Boiler Model System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / 200 / 300 / Vitotronic 300-K with Vitotronic 100 Emissions test mode Internal electronics fault
Vitocontrol-S with Vitotronic 100 / Vitodens 200-W Regulates as if the outside temperature was 32°F (0°C) Internal fault
Vitotronic 050/200-H Undefined control characteristics Internal electronics fault

Fault Code B5

Listed below are the possible faults for the error code B5.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Control mode Internal electronics fault

Fault Code B6

Listed below are the possible faults for the error code B6.
td>All Viessmann boilers

Boiler Model System Behaviour Cause of Problem
Constant mode Invalid hardware recognised

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

Listed below are the possible faults for the error code B9, ED, F0, FE5, FEC, FED, FEE, FEF, FFD and FFF.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Normal operation / fault around burner control unit Internal fault

Fault Code C1

Listed below are the possible faults for the error code C1.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Control Mode External safety equipment

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

Listed below are the possible faults for the 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 Model System Behaviour Cause of Problem
All Viessmann boilers Control mode Open circuit – KM BUS to solar control unit / Extension AM1 / DE1-DE3 M1 / communication fault

Fault Code C9, CA and CB

Listed below are the possible faults for the error code C9, CA and CB.

Boiler Model System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / 300 / Vitotronic 300-K with Vitotronic 300 Boiler cools down Error: Maximum pressure limiter 1 2

Fault Code CC and F0

Listed below are the possible faults for the error code CC and F0.

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

Fault Code D4

Listed below are the possible faults for the error code D4.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Boiler cools down Fixed high limit has responded or fuse F2 has blown.

Fault Code D5

Listed below are the possible faults for the error code D5.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Boiler drives up to electronic maximum limit Boiler does not log in at the cascade control unit

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

Listed below are the possible faults for the error code E1, E7, E8, E9, EA, EB, EC and FF2.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Burner in fault mode Ionization current too high during calibration

Fault Code E2 and E3

Listed below are the possible faults for the error code E2 and E3.

Boiler Model System Behaviour Cause of Problem
Vitodens 200-W / 222-F / Vitotronic 300 Burner in fault mode Heating water flow rate too low during calibration; flow switch caused shutdown

Fault Code E4

Listed below are the possible faults for the error code E4.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Burner blocked Fault, supply voltage 24V

Fault Code EE and EF

Listed below are the possible faults for the error code EE and EF.

Boiler Model System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitocrossal 300 / Vitodens 200-W / 222-F / Vitotronic 300 Burner in fault mode At burner start, flame signal is missing or too weak

Fault Code F5

Listed below are the possible faults for the error code F5.

Boiler Model System Behaviour Cause of Problem
Vitodens 100-W / 200 / 300 / Vitotronic 300 Burner blocked Faulty Air pressure switch

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

Listed below are the possible faults for the error code F6, 58, F9, FE1, FE2 and FF6.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Gas pressure switch shows no gas pressure / Electrical connection fault Gas shut-off valve closed; gas pressure switch faulty; multiple problems with gas supply

Fault Code FA and FB

Listed below are the possible faults for the error code FA and FB.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Burner in fault mode / Emergency operation Fan not at standstill / plug-in connection

Fault Code FC

Listed below are the possible faults for the error code FC.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Burner in fault mode Gas valve faulty or faulty modulation valve control; or vent system blocked

Fault Code FE

Listed below are the possible faults for the error code FE.

Boiler Model System Behaviour Cause of Problem
All Viessmann boilers Burner blocked or in fault mode Strong interference (EMC) field nearby, or Faulty main PCB

Fault Code FE4

Listed below are the possible faults for the error code FE4.

Boiler Model System Behaviour Cause of Problem
Vitocrossal 200 Burner shuts down Multiple detection of undervoltage

Fault Code FFA, FFB and FR

Listed below are the possible faults for the error code FFA, FFB and FR.

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