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It seems my heil heat pump is going into defrost every time it comes on and blowing a smell back into the vents in my home.The unit will come on heat up and then we smell this odor. It has not been very cold here yet for it to be defrosting that much and I don't see the steam blowing outside from the unit.I had a problem with the fan motor back in the summer and a service man replaced it I was wondering if this has cause the problem now with the heat. The unit is only 2 1/2 years old.Could someone tell me if they know what this problem might be?

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Yep it is the heater core, you need to replace it

Posted on May 14, 2012

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I would have either the circuit board that makes it go into defrost checked, our new Trane had same problem and we had to replace it, or also have them check the sensor that "tells" the unit to go into defrost. I'm suspecting that is happening in ours now, too, as it seems to go into defrost more often again, but not as bad as last year. As for the odor, you have what we, and a lot of others have, is called "dirty sock syndrome", appears to be cause by organisms of some sort growing on the coil in the indoor unit, when it goes into defrost mode the coil gets wet and "turns them on" thus making the organisms smell. Difficult to get rid of. Am going to try a spray called Alathene II and see if that helps.

Posted on Nov 19, 2010


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I assume this is a heat pump. The outside unit may be icing up. It should have a defrost cycle with electronic control that sometimes fails or sensor associated with the electronic determination of when to defrost may have failed or may not be sensing because its out of position. You can check for a defrost problem. If frost is blocking the outside unit air will not pass through it after the frost builds up and you may be able to see the white frost as well. If all this is true you need to get a service manual and use its procedures to find out why the unit is not defrosting.

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This is a condition called Dirty Socks Syndrome air cleaners and dehumidify usually fix the problem also adding a uv light to the duct can remedy the problem the light is probally the cheapest solution

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