I return to install 10 KW heat kit and also replaced TXV valve. I tested system in both heating and cooling and both work well. Upon arriving system was not heating I first found that the thermostat was wired incorrectly with the white wire being plugged into W/electric heat, when it should be plugged into a W-2 due to it being a heat pump. Also, the thermostat was program incorrectly. Additionally, the suction line pressure dropped to 15 psi‘s when operating in heat. However, when switching to cool mold, pressures operated normally. There is a restriction at the outdoor TXV, which needs to be replaced. Also, the heat sequencer was faulty. Customer approved repair items need it will be an outdoor TXV and a three stack heat sequencer.