Found air handler breaker tripped. Ran the unit in heat mode and checked heat strip amp draws, which are normal. Visually inspected all electrical components, ask if which were in good shape. Compared the required breaker size with the actual breaker size, they matched up. Checked the electrical connections for the high voltage in the air handler and in the breaker box. Found one leg of power's lug but to be very loose. This will cause overheating and tripped breakers. Tightened it up and unit is running fine.