Viessmann Boiler Error Codes

Viessmann Boiler Error Codes

Viessmann Error Codes


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Vitodens 200 Boiler Error Codes

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

Fault Code 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

Fault Code 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

Fault Code 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 Boiler service required
Vitotronic 200 / 300 Normal operation Boiler 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

Fault Code 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

Error Code 10, 14, F3, and F4

Fault Code 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 Short circuit – outdoor temperature sensor
Vitotronic 300-K, MW2S with Vitotronic 100 / Vitodens 100-W (combiPLUS) / 200-w / Vitocontrol-S, WB2B with Vitotronic 100 Control as if the outdoor temperature is in constant mode Outdoor temperature sensor shorted out

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Fault Code 18 and D1

Fault Code 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

Fault Code System Behaviour Cause of Problem
Vitotronic 300 Activates after 0°C / 32°F outdoor temperature Communication fault, wireless outdoor temperature sensor

Fault Code 20

Fault Code 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 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

Fault Code System Behaviour Cause of Problem
Vitotronic 200 / 300 Operation without influence of return water temperature Short circuit – Return water temperature sensor

Error Code 28

Fault Code 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 might 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 in 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

Fault Code 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

Fault Code System Behaviour Cause of Problem
Vitocontrol-S, with Vitotronic 100 / Vitocrossal 300 / Vitodens 200-W / 222-F / Vitotronic 100 / 200 / 300 Adjustable high limit burner is started and stopped 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

Fault Code 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

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Error Code 40 and 44

Fault Code System Behaviour Cause of Problem
All Viessmann boilers Mixing valve closed Heating circuit 2 with mixing valve supply short circuit on temperature sensor

Fault Code 41

Fault Code 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

Fault Code 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

Fault Code 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

Error Code 52

Fault Code 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

Fault Code 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

Fault Code 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

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

Fault Code 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

Fault Code 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

Fault Code 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

Error Code 88, 89, and E6

Fault Code System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 300-K with Vitotronic 100 / 200 Control mode Communication error

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

Fault Code System Behaviour Cause of Problem
Vitotronic 300 Burner control unit in an error mode Lead break, boiler water temperature sensor, burner control unit

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

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

Error Code A0, A1, A2, AA, and AC

Fault Code System Behaviour Cause of Problem
Vitodens 200 Pump running at maximum speed Open circuit – Internal BUS connection issue

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Fault Code A3, B0, F1, FE1 and FE2

Fault Code System Behaviour Cause of Problem
Vitocrossal 300 / Vitodens 200-W / 222-F / 300 Control mode is in factory default setting Programming unit is faulty

Fault Code A4

Fault Code System Behaviour Cause of Problem
222-F

Burner blocked. The venting program automatically starting Air lock in the internal circulation pump or minimum flow rate not achieved

Fault Code A7

Fault Code System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / Vitotronic 300-K with Vitotronic 300 Control mode (stays in factory default setting) Isolation valve error coding OC:2, OC:3 or OC:4 set, and coding 4E:1 not set

Error Code A8

Fault Code System Behaviour Cause of Problem
All Boilers Control mode issue Programming unit communication fault

Fault Code A9, BA, BB, BC and FE0

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

Fault Code AD

Fault Code System Behaviour Cause of Problem
Vitodens 200 Setting via service level not possible Data points are not stored internal error VR20

Fault Code B1

Fault Code System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitotronic 100 / 200 / 300 / Vitotronic 300-K with Vitotronic 100 Test mode on emissions Internal electronics error
Vitocontrol-S with Vitotronic 100 / Vitodens 200-W Regulates as if the outside temperature was 32°F Internal error
Vitotronic 050/200-H Control characteristics undefined Electronics internal error

Error Code B2

Fault Code System Behaviour Cause of Problem
All viessmann boilers Control mode Internal electronics error

Fault Code B3 and E5

Fault Code System Behaviour Cause of Problem
All boilers Constant Mode Invalid hardware recognised

Fault Code B4

Fault Code 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

Fault Code System Behaviour Cause of Problem
All Viessmann boilers Control mode External safety equipment

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Error Code B6

Fault Code System Behaviour Cause of Problem
All Viessmann boilers Control mode Open circuit – KM bus to solar control unit communication error

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

Fault Code 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 C1

Fault Code System Behaviour Cause of Problem
All Viessmann boilers Burner control unit switches to lockout, this could be due to large line voltage fluctuations Differential air pressure sensor open circuit

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

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

Error code C9, CA and CB

Fault Code 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

Error code CC and F0

Fault Code System Behaviour Cause of Problem
All viessmann boilers Burner control unit is in fault mode Ionisation current too high during calibration – Boiler temperature limiter responded air or blockage in system/pump error

Fault Code D4

Boiler cools down
Error with safety equipment at ‘X2/X3/X7’ of plug-in adaptor 2 for external safety equipment

Fault Code System Behaviour Cause of Problem
Vitotronic 300 / Vitotronic 300-K with Vitotronic 300
Vitodens 200 Boiler is operating in emergency mode (after 30 mins BUS error) or boiler cools down Internal bus error or open circuit internal bus connection

Fault Code D5

Fault Code System Behaviour Cause of Problem
All Viessmann boilers Burner blocked Flue gas temperature sensor not properly positioned – Check Sensor External pump fitted on system

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

Fault Code System Behaviour Cause of Problem
Vitodens 200-W / 222-F / Vitotronic 300 Burner in fault mode Flow rate for heating hot water is too low during calibration / flow switch caused shutdown

Error Code E2 and E3

Fault Code System Behaviour Cause of Problem
All boilers Burner in fault mode Heating water flow rate too low during calibration; flow switch caused shutdown

Fault Code E4

Fault Code System Behaviour Cause of Problem
Vitotronic 300, Vitodens 200-W, 222-F, Vitocrossal 300, Vitocontrol-S with Vitotronic 100 Burner error Burner start flame signal is too weak or missing

Fault Code EE and EF

Fault Code System Behaviour Cause of Problem
Vitocontrol-S with Vitotronic 100 / Vitocrossal 300 / Vitodens 200-W / 222-F / Vitotronic 300 Burner blocked Faulty air pressure – switch air damper flap is stuck

Fault Code F5

Fault Code System Behaviour Cause of Problem
All viessmann boilers Gas pressure switch shows no gas pressure / electrical connection error Gas shut-off valve closed / gas pressure switch faulty / multiple problems with gas supply

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

Fault Code System Behaviour Cause of Problem
All Viessmann boilers Burner in error mode emergency operation Fan not at standstill / plug-in connection error

Fault Code FA and FB

Fault Code System Behaviour Cause of Problem
All Viessmann boilers Control mode Communication fault with boiler

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Error Code FB7, FF4, FF2, FF7, FF8 and FF9

Fault Code System Behaviour Cause of Problem
Vitocrossal 200 Case A: Burner control unit in a fault state; system cools down; burner control unit locked out.
Case B: Type of coding card
Case A: Coding card not inserted in the burner control unit; incorrect or faulty coding card.
Case B: Coding card does not match burner control unit.

Fault Code FC

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

Error Code FE

Fault Code System Behaviour Cause of Problem
All Viessmann boilers Burner blocked or in error mode Strong interference (EMC) field nearby, or faulty main PCB

Error Code FE4

Fault Code System Behaviour Cause of Problem
Vitocrossal 200 Burner shuts down Multiple detection of undervoltage

Fault Code FFA, FFB and FR

Fault Code 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

Viessmann Error Code F4 EE

Viessmann error code F4 EE means that the condensate pipe has frozen and needs to be thawed. You can thaw out the pipe yourself fairly quickly and easily without the need for an engineer but don’t hesitate to contact one if you feel confident enough. Find out how with our guide to thawing out a frozen condensate pipe.


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