Rheem Criterion II model #RFDG-12EARJR - Its summer and the furnace shouldn't be running, (No central AC). About a week ago I heard what I thought was the furnace start. It ran for about 20 seconds then stopped. I heard it a couple more times. I checked the thermostat and it is set properly. Still experienced the furnace starting, turned off the thermostat and have heard the furnace start. I dont think it produces heat a fan or blower starts then stops. Where should I start to trouble shoot this?
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