We have a Westinghouse heating/air conditioning unit that is about two years old. Never had any problems until now, and in the last six weeks, the breaker has flipped off three times when the unit is on. The person who installed the unit insists it is the breaker. We had the breaker replaced two days ago, and this morning it flipped off. The unit only draws 60 amps tops, and the breaker is a 70 amp. What could be causing this? Any suggestions?