
Vaillant EcoTEC Pro, EcoFIT Pure & EcoTEC Plus Boiler Error Codes
Vaillant’s award-winning combination, system and open vent boilers are renowned for their reliability, performance and efficiency.
Sometimes things can go wrong, so we’ve created a handy table of Vaillant error codes below.
F – Fault Code | Possible Cause |
---|---|
F.0/F.00 | Flow temperature sensor interruption |
F1./F.01 | Return temperature sensor interruption |
F.10 | Flow NTC short circuit |
F.11 | Return NTC short circuit |
F.20 | Safety switch off temperature limiter |
F.22 | Safety switch off low water pressure |
F.23 | Safety switch off temperature difference too great |
F.24 | Safety switch off temperature is rising to fast |
F.25 | Safety switch off flue gas temperature too high |
F.26 | Error with gas valve – possible no function |
F.27 | Safety switch off flame simulation |
F.28 | Failure during start up – ignition unsuccessful to start |
F.29 | Failure during operation – re-ignition unsuccessful |
F.32 | Fan error |
F.49 | eBUS error – possible short circuit |
F.61 | – Error with gas valve regulation |
F.62 | Error with gas valve – switch off delay |
F.63 | EEPROM error |
F.64 | Electronics / NTC error |
F.65 | Electronic temperature error could be overheating due to external influences |
F.67 | Electronics flame signal error |
F.68 | Unstable flame signal error air in gas |
F.70 | Invalid device specific number (DSN) |
F.71 | Flow NTC error – flow temperature sensor signal constant value |
F.72 | Flow return NTC error – temperature difference too great |
F.73 | Water pressure sensor signal in the wrong range, it is too low |
F.74 | Water pressure sensor signal outside correct range, the sensor signal is too high |
F.75 | Error with pressure – no pressure change detection when starting the pump |
F.76 | Overheating protection on – primary heat exchanger has responded |
F.77 | Flue non return flap condensate pump error |
F.78 | Interruption to DHW outlet sensor at external controller |
F.83 | Flow and or return temperature sensor error |
F.84 | Error with flow/return temperature sensor temperature changing error |
F.85 | Error with flow and return temperature, sensor incorrectly fitted |
CONNECTION | No communication with the PCB |
S – Fault Code | Possible Cause |
---|---|
S.00 | Heating mode error – no heat demand |
S.01 | Heating mode fan start-up |
S.02 | Heating mode error – water pump running |
S.03 | Heating mode – ignition sequence error |
S.04 | Heating mode – burner ignited |
S.06 | – Heating mode – fan overrun error/td> |
S.07 | Heating mode – pump overrun error |
S.08 | Heating remaining cut off time xx minutes |
S.10 | Hot water demand via impeller sensor |
S.11 | DHW mode fan start up error |
S.13 | DHW mode ignition error |
S.14 | Hot water demand via fan sensor error |
S.15 | DHW mode pump and fan overrun |
S.16 | DHW mode – fan overrun error |
S.17 | DHW mode – pump overrun error |
S.20 | DHW mode – burner on error |
S.21 | DHW mode – fan start up error |
S.22 | DHW demand – error pump running |
S.23 | DHW ignition error |
S.24 | DHW mode – burner error |
S.25 | DHW mode – pump or fan overrun error |
S.26 | DHW mode – fan overrun |
S.27 | DHW mode – pump overrun |
S.28 | Hot water burner anti-cycling time |
S.30 | Room thermostat is blocking heating mode |
S.31 | No heat demand boiler in summer operating mode |
S.32 | Waiting period because of fan speed deviation |
S.34 | Heating mode frost protection error |
S.39/td> | Burner off contact has been triggered this could be because of contact thermostat or condensate pump |
S.40 | Comfort safety mode active |
S.41 | Water pressure > 2.8 bar |
S.42 | Flue non return flap return signal blocks burner operation |
S.46 | Comfort safety mode flame loss at minimum load |
S.53 | Boiler is in waiting period of modulation f block function due to water shortage |
S.54 | Boiler is in waiting period of operation, blocking function as a result |
S.57 | Waiting period comfort safety mode |
S.58 | Modulation limitation due to noise / wind error |
S.61 | Gas family check unsuccessful |
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