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Vaillant EcoTEC 65kW Error Codes

Listed below are the most common error codes that you might see on your Vaillant EcoTEC 65kW boiler.

Fault Code Possible Cause
S.O Heating issue, no heat demand
S.1 Fan start-up error
S.2 Pump flow error
S.3 Heating mode error – ignition problem
S.4 Heat mode – burner on error
S.6 Heating mode – fan overrun error
S.7 Heating mode – pump overrun error
S.8 Heating remaining cut off for XX amount of time
S.31 No heat demand summer operating mode
S.34 Heating mode frost protection error
S.20 Hot water requirement error
S.22 Hot water handling pump flow error
S.24 Hot water operation burner is on
S.85 Service message quantity of circulation water

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