Ok here it goes... I got one driving me crazy.This is a heatpump. In a dentist office the hyg. area the grils are turning on the heat in the morning then turning on the ac when in the afternoon. They call me in the afternoon and say the ac is not working. I changed out the compressor about a month ago and sometimes when I go to check it out the pressures look great. But the compressor is tripped out on hi temp. or tripping the breaker. I went out yesterday and replaced the dryer filter. Pulled a new vac and got the pressures set. For sh** and giggles I pulled the guages off and connected to the unit beside the one I was working on to verify the pressures and both were the same. Any suggestions on what the problem could be?