The reset is at the top left side of the furnace. take the cover off n press the red button. the switch could be failing but CHECK drafting through the furnace. hold a flame at the top of the furnace n make sure its pulling inward. u could have a blocked vent pipe or vent cap which will cause excessive heat n tip the safety switch. good luck!
1st you need to find it. With the power off if it is a manual reset switch there should be a small red button between the two wires that are connected to it. Press the red button in and you should hear a click. Turn the power back on and give it a try. Remember the switch tripped for a reason. If the furnace is not venting properly and the vent is spelling it is shutting the heater off so you are not effixiated by the products of combustion.
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