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My money is on the thermostat, that would cause an intermittent failure, it's just a bi- metal operated electrical set of contacts, a popular name brand is Klixon, I have replaced hundreds of them in my HVAC business.
The old 'cheapest bidder' deal when making something.
Good luck on it, can be a frustrating event.
A cheap change-out if you are in doubt.
Ozz
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