I completed diagnostics and found the reversing valve was ticking, voltage on R would fluctuate between 1.9-12 volts. I needed to change batteries in thermostat. I found the auxiliary drain pan switch “puck type” was shorted. I found moisture present in puck switch. After further investigation found the switch actually took on oil from suction line above as the insulation had traces of oil present which shorted the switch. I removed insulation to inspect and found leak on suction line at coupler at air handler. I checked pressures and the unit was low on charge. Charged unit to proper pressures and removed shorted switch from system. Note: system does have another safety inline for protection