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Vaillant aroTHERM fault codes

30 codes from the Vaillant manual for the aroTHERM heat pump. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
F.073Sensor fault: building circ. water pressure
F.094Fault: vortex
F.103Fault: spare part ident
F.1117Compressor: phase failure
F.22Heating installation filling pressure critically low
F.514Sensor fault: compr. inlet temp
F.517Sensor fault: compr. outlet temp
F.519Sensor fault: building circuit return temp
F.520Sensor fault: building circuit flow temp
F.526Sensor fault: EEV outlet temp
F.582Fault: EEV
F.585Sensor fault: capac. outlet temp
F.723Building circuit: pressure too low
F.729Compressor outlet temperature too low
F.731High-pressure switch open
F.732Compressor outlet temperature too high
F.733Evaporation temperature too low
F.734Condensation temperature too low
F.735Evaporation temperature too high
F.737Condensation temperature too high
F.741Building circuit: return temp. too low
F.752Fault: frequency converter
F.755Fault: 4-port valve position not correct
F.774Sensor fault: air inlet temp
F.788Building circuit: pump fault
F.817Freq. converter fault: compressor
F.819Freq. converter fault: overheating
F.825Sensor fault: capac. inlet temp
LHM37Comfort protection mode active
M32Low heating installation filling pressure warning