Heat pump Out door unit is not running
I have a carrier heat pump.
Coming back from a trip the family turned on the thermostat to emergency heating as the only way to get the house warm.
Setting the thermostat to normaly heating, the outdoor condenser does nothing.
Main breaker in the breakerbox was tripped.
I reset the breaker, turned the thermostat to heating, went outside to observe the condenser unit, and only a slight hum was present (not from the compressor).
Not compressor activity nor fan activity.
When pressing the solenoid switch, a brief spark (indicating that there is a current going to the Condenser, and then nothing. Turned out that the breaker tripped again.
I noticed that the pressure on both High and low side is about 100PSI whereas the unit on the specs mentions 300 PSI high SIde, 150 PSI low side.
What can be the problem?