On inspection of the outdoor unit, I noticed that the two going to the TXB on the unit as possible. This would have to be replaced for heating. Found compressor should be using the internal bypass for the refrigerant being pressure is equal, which is the possibility that is the reason why the thermal overload when we got here. The system is 15 years old and I recommend it . The compressor was drawing almost 12 A which is about double of a new system.