All observations at outside unit. Suction side pressure is 150 psi all the time, high side is always 0 psi. Even after unit has been off for a day, pressure does not equalize. Even when unit is on, compressor getting hot, pressures do not change. Sounds like compressor makes a hum sound every 5 minutes, like its trying to start, and the current to the compressor rises for that short time.
Also I don't really see any current going into the compressor with a clamp on ammeter except for that 2 second time period, every 5 minutes or so, even though the compressor is getting hot (strange).
Tried going to heat cycle to switch reversing valve, pressures stay the same, and nothing else changes. Oil is all over bottom of unit and inside fittings near top of all tubing, valves, etc inside unit. Oil is not just on bottom of unit.
1. Should not the pressures equalize after unit is off for a while ? Why does the low always stay at 150 ? 2. Seems like oil and charge came out of high side, being its always 0 ? 3. Does this seem like an outside compressor/valve problem and not inside air handler/expansion valve problem ? 4. Could I force a voltage on the reversing valve with a power supply and see if it switches, and should the pressure release to a more normal value on the low side ?