I have a Carrier Heat pump, about 2 years old (new home). Yesterday the main breaker tripped. After wondering why the house was 20 degrees below set point I discovered that problem, I reset it and all seems well. My AH filter is 4" 3M (20" x 25") only about 2 months old, so I don't think it's a AH resistance problem. Should I call an HVAC guy to check it out or wait to see if it trips again? Seems to cool and heat fine.