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Vaillant EcoTEC Pro / EcoTEC Plus

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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