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Viessmann Boiler Error Codes

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
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

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 senso

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

Error Code 40 and 44

Fault Code
System Behaviour
Cause of Problem
All Viessmann boilers
Burner blocked
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 300Vitotronic 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

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

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-
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

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
Vitotronic 300, Vitodens 200-W, 222-F, Vitocrossal 300, Vitocontrol-S with Vitotronic 100
Burner blocked
Broken gas valve or 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
Gas shut-off valve closed / gas pressure switch faulty / multiple problems with gasFan not at standstill / plug-in connection error supply

Fault Code FA and FB

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

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

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