Vaillant EcoTEC Pro & 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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