BoilerFaultCodes.com

Vaillant ecoTEC 65kW Fault Codes

System Natural Gas 65 kW 2006-2018 Discontinued

Replaced by: ecoTEC plus 48-64kW

All 14 fault codes

Code Severity Plain English
S.1 High Your boiler is trying to start up but the internal fan is not spinning properly, preventing the heating from firing up.
S.2 High Your boiler has sensed that water isn't moving through the unit as quickly as it should be, causing it to stop heating to prevent overheating.
S.3 High Your boiler is struggling to light its flame, meaning your heating and hot water will likely stop working soon.
S.4 Low Your boiler is currently firing up to provide central heating and is functioning as expected.
S.6 High Your boiler's fan is staying on for too long or running when it should be finished, preventing the next heating cycle from starting safely.
S.7 High Your boiler is struggling to circulate water properly after turning off the heating, which is likely caused by a blockage or a pump issue.
S.8 Low Your boiler is temporarily pausing heating because it thinks the house is warm enough or to prevent the system from getting too hot too quickly.
S.20 Low Your boiler has received a request to provide hot water but is currently unable to complete the cycle, often because it is already cooling down or busy with another task.
S.22 High Your boiler has detected a problem with the flow of water while trying to heat your taps, which usually means water isn't moving through the system correctly.
S.24 Low This is a normal status message indicating that your boiler is currently working correctly to heat your hot water.
S.31 Low Your boiler is currently set to summer mode, which means it is only providing hot water and has intentionally ignored the request for central heating.
S.34 Medium Your boiler has paused because it detects a risk of its internal pipes freezing while trying to heat your home.
S.85 Low Your boiler is struggling to move enough water through its system, which is slowing down its performance.
S.O Low Your boiler is working correctly but is currently in standby because it hasn't received a signal from your thermostat to turn the heating on.

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