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Question:

When I turn on central heat I get hot air for a few minutes and then cold air. Help!!?

The unit is only about 6 years old. I had the ducts and A/C unit cleaned two days ago. Could they have done something to break it? or else what could it be? It should not break after 6 years...

Answer:

Depends on if you have a gas or electric furnace on what the problem is. If you have a gas furnace then it sounds like your flame sensor is dirty. It is located either right next to the pilot light or right in front of either the first or second burner. It is a metal rod with ceramic at the other end with one wire plugged into the ceramic end. You need to clean it with fine sandpaper or steel wool. If you have an electric then it sounds like it's going out on a limit. In either case you should call back out the service company who cleaned it and tell it's not working now. This is a call back and they should not charge you for this call. Hope this helps
most new furnaces have a computer board that blinks when something is wrong. the number of blinks indicates the problem. when your furnace blows cold air its telling you somethings wrong.but when your home reaches the temp you set it for the blower on some furnaces may continue to blow for a short time to cool the heat exchanger. but without hands on it could be a number of things.
Well when i bite into a york pepper mint patty I get a coooool sensation your heating element or thermostat is out or going out

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