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this means an overtemp condition happened at compressor outside.
This can be:
dirty coil (outside)
plugged refrigerant circuit
low on refrigerant
Basically something is making the compressor hot. Usually the first thing to check is wiring connections and refrigerant level
does the outdoor fan run?
Then you may have a reverse valve issue. The unit should be under warranty if less than a year old. have you contacted the installer?
so does the p2 happen whether it is heating or cooling?
I know it may appear properly charged but that is a sign of low refrigerant..which is more evident in heat mode...are you positive about the refrigerant charge?