Vaillant EcoTEC Pro / EcoTEC Plus Error Codes
Listed below are the most common error codes that you might see on your Vaillant EcoTEC Pro boiler.
| Fault Code | Possible Cause |
|---|---|
| F.00 / F.0 | Flow temperature sensor interruption |
| F.01 / F.1 | 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 |
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