I recently reinstalled a trane split system heat pump. The model number is TWX036C100A0 . The problem im have that is in Cool mode the system works fine, it about 45 to 50 degrees outside temp. The pressure is about 50psi on the low side and 120 on the cool side . But when i switch it to heat mode the pressure equalize about 300 psi on the high and low side. I waited about five to eight minute to see if it will do anything but it didnt. I was told that i might about 15 min to twenty minutes. need your help.