Sounds like a thermal overload breaker. If it made a slight click or you felt a slight click, that was the reset.
Most thermal switches are buckle switches that trip at a certain temp. Some will automatically reset when the temp goes down significantly, some require a manual reset. The ones with a button are manual reset.
The idea of the manual reset is that something went wrong if it tripped, so it requires a tech to check out the unit and then reset the breaker.
Besides a failure of the system, possibilities are inadequate cooling, (not enough air moving or input air too high a temp), or a defective switch.
Philadelphia, PA (Really Bensalem)
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