The coil sensor ohmed at 15000, which is 59 degrees so it is bad and needs replaced. The defrost board will not let the heat pump go into defrost it also is bad and needs replaced. I did Heat maintenance on air handler, upstairs unit, rheem. I cannot complete maintenance on outside unit due to unit frozen, cannot check pressures at this time. The parts is under warranty, labor. Office will confirm. Please order parts listed above.