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Have a heating unit by carrier and it's push out cold air. the outside door was open and i didn't know it. what could it be.

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  • Keith Miller
    Keith Miller May 11, 2010

    is this a gas unit is the flame lit

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Make sure the gas is on and the ignitor glows or sparks if you get that it should light up flames and blow warm. if the ignitor never works you may have a bad ignitor or the combustion gas removal motor may not be operating properly. how old is your system?

Posted on Jan 05, 2009

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1 Answer

Heat comes on when the temperature setting calls for cool.


getting heat in the cooling mode leans toward the reversing valve in the outside unit. it changes the flow of refergerint so that the hot air you get outside in the summer is blown inside in the winter. another possibility is that the reversing valve isn't getting 24v check to see if you have 24v at O and C either at the t-stat, furnace, or the outside unit. if you check at the furnace rember the safty switch for the lower door if that switch is open you will have no power. i would look at the t stat first if you have 24v there go to the outside . 24v present outside will mean a bad valve or board, no 24v means a bad or broken conection in the control wire between the stat and the outside unit(usally the orange wire)

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if you look inside the condenser unit outside,see if you see the big reversing valve,if not it is a straight cool,heat, the heat strip ins in the air handler so you would have to take the side panel off and look for the heat stripe,my the way heat pumps also have a aux.heat stripe just in case it does not get cold enough outside,hope this helps you-mike

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