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Clicking contactor on air handler
I have had two different HVAC companies and several techs look at my system to try to troubleshoot my problem, they all had different answers. And I'm tired of hanging parts trying fix the problem. I have Trane Heat Pump with an American Standard air handler. I have went through three contactors on the furnace (air handler) in the last couple of years. They start clicking at five to ten second intervals, usually early in the morning, them start buzzing until the contacts are burned up. Parts that I have replaced already as per their suggestions are defrost timer board on heat pump, both sequencers on heat banks, and thermal sensor. Cleaned blower housing, and replace filter every two weeks. Checked charge on heat pump. Replaced thermostat with digital one. Still no help. I am not a professional, but can figure out most problems, but this one is driving me nuts. I am not a rich man, and can't afford these guys charging $ 100.00 per trip to suggest more parts. Any ideas would be greatly appreciated.