Problem: My outdoor air conditioning unit’s high pressure switch trips ever so often. Why does the high pressure switch trip so often?
Answer: The high pressure switch tripping on an air conditioner or heat pump unit can be caused by several things:
1. Dirty outdoor coil. Turn off power and clean with a garden hose.
2. Slow or dragging fan motor. Replace motor or capacitor. I would recommend testing the capacitor first. I would need to know the capacitor specs (uf/mfd and voltage rating) to recommend a replacement.
3. Motor or fan blade going the wrong direction. Air should come out of the top of your unit.
4. System over-charged with refrigerant. Would need gauges to check this.
5. Faulty high pressure switch tripping without having high pressure. High pressure switches are usually set to trip at a little over 300 psi. Sometimes I have seen switches trip for no reason at all.
6. A blockage in the refrigeration cycle. This could be a TXV valve or metering device that is partially stopped up or not working correctly.
7. Extreme high outdoor temperatures above 100 degrees. Your outdoor unit has to be clean to run properly under high outdoor temperatures. I would recommend that your unit is thoroughly cleaned and charged properly. If you have any other questions please feel free to email us at: firstname.lastname@example.org or comment in the comments section below. We would love to answer your questions and have your business!
We hope you can easily find and fix the problem. We would love to help you out and earn your business! Steve & Barbara Arnold