Self diagnose your boiler faults.
Viessmann boilers are known for excellent energy efficiency and reliability. Viessmann is an german boiler manufacturer with a heritage of well over 100 years.
The most common error codes you will find on your Viessmann boiler are 50, 51, 58, 59, the error message Pressure gauge reading lower than 1 bar and in winter the error code F4 EE. If you get this code displaying on the boiler display then this will be a blocked condensate pipe. Let our Northampton boiler repair experts fix your boiler.
If you have 50, 51, 58, 59 – No hot water but heating works – you have a problem with your DHW. DHW tank temperature sensor or lead break has short circuited or an open circuit.
| Fault/Error Code | Possible Cause |
|---|---|
| 0B | Blocked burner, burner control switches to lockout – Vitodens 200 – Vitodens 100-W Flow direction incorrect, Water flow insufficient, Flow switch is defective, The vent system has been effected by severe wind conditions (Need a boiler repair engineer). |
| 0A | Vitodens 200 – The fan speed is faulty. The controls switch to lockout. (Need a boiler repair engineer) |
| 0F | Vitodens 200-W – Service is required. (Northampton & Wellingborough: Need a boiler service engineer) |
| E1, E7, E8, E9, EA, EB, EC, FF2 | All Viessmann boilers – Fault mode in relation to burner – During calibration ionization is too high |
| D4 | All Viessmann boilers – Fuse F2 has blown or fixed high limit has responded |
| F6, 58, F9, FE1, FE2, FF6 | All Viessmann boilers – Gas pressure switch is showing there is no gas pressure or electrical connection fault – Gas valve shut off, Multiple issues with gas supply, Faulty gas pressure switch (Need a boiler repair engineer) |
| FC | All Viessmann boilers -Fault mode in relation to burner. Faulty gas valve, Vent system blocked, Faulty modulation valve control |
| 38 | Vitodens 100-W – Water temperature sensor lead broken – (Need a boiler repair engineer) |
| 35 | Vitodens 200 – The reset button has been pressed, whilst the burner is off, but the emissions test switch is turned to the hand symbol. |
| 40, 44 | All Viessmann boilers – Heating circuit 2 with mixing valve supply short circuit on temperature sensor |
| 80, 81, 82, 83, FD | All Viessmann boilers – Water temperature sensor or burner control unit has short circuited |
| 90, 91, 92, 93, 94, 98, 99, 9A, 9B , 9C, 9E, 9F, AB | All Viessmann boilers – Temperature sensor has short circuited |
| B9, ED, F0, FE5, FEC, FED, FEE, FEF, FFD, FFF | All Viessmann boilers – Fault of boiler control unit (Need a boiler repair engineer) |
| C2-C8, CD-CF, D2-D8, DA-DF, E0 | All Viessmann boilers – Open circuit on KM BUS to solar control unit AM1 Extension, DE-DE3 M1, Communication fault |
| CC, F0 | Vitodens 200 – Large voltage fluctuations means the burner control unit switches to lockout – Differential air pressure sensor or open circuit |
| FE | All Viessmann boilers – Faulty main printed circuit board, Fault mode in relation to burner |
| A3, B0, F1, FE1, FE2 | All Viessmann boilers – Check flue gas temperature centre, it may not be properly positioned |
Head Office:
THS Plumbing & Heating Northampton
3 Sunningdale Close
Northampton
NN2 7LR
Tel: 01604 212732
Open: Monday-Sunday 7:30am - 10:00pm
