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from my mind asked Why does my central heat come on then goes off?
I tried replacing the battery in the thermostat, but the unit will come on for 2 seconds then cut off..then come back on and stay on until the air temp matches the thermostat setting
And got the following answer:
It sounds like you have a late model (newer) furnace. When your furnace first comes on do you hear a small fan motor running (combustible fan motor) ?. It will run for about 90 seconds and then you hear a click (hot surface igniter relay is activated) about 60 seconds later you will here a click (gas valve opens) and then you hear the burners ignite. In about 80 seconds you will hear the blower motor start up. It sounds as though the burners are failing to ignite the first time. This could be caused by a bad flame sensor, a bad limit switch. a poor connection (loose wire on the inside of the furnace) But I would first concentrate my efforts on the flame sensor. Turn off the power to the unit. remove the front cover (the louvered section). Located near the burner gas manifold you will see a stainless steel probe located in the center of one of the burners, with a small piece of sand paper clean this probe. Replace the louvred cover, re-power the unit, go to your thermostat and place it on heat-raise the temp as high as it will go and see if this corrects your problem. If you are uncomfortable doing this call a LICENSED service company from your local yellow pages and request service. This part with labor will cost aboutr $135.00