The timer can be checked easy. Just remove the fat red wire from terminal RH connect a meter lead to that terminal.Put the other lead on any other timer terminal, move the timer knob around. As it makes and breaks when you hear clicks if you don't get any reading then the contact is burned. But burned contacts are NOT intermittant.Thats why I say the breaker needs attention. They get hot on the heat side of the breaker and open. The motor runs on 120 volts so it is not affected.
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