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I have an electric furnace and heat pump that will at times blow only cold air during the heating season. I have checked the filter and don't believe that to be a problem. I usually have the temperature set to 74 degrees. When the outdoor temp. is extremely cold the axillary heat indicator will be on and still no heat. I can turn the heat pump off by switching to emergency heat and will get some heat from that but not as warm as I think it should be and even that will at times only blow cool air. Usually after switching between the two settings once or twice I will begin to get sufficient heat. I have checked the outdoor unit and there is no ice build up and it appears to be functioning properly. So there it is, I hope you can help. Thanks, Dan

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You are losing operation to your heat strips.

In heat pumps, there is a secondary heat source. Usually electric heat strips. (Sometimes a gas furnace, this is known as a "dual fuel" system)

The heat strips (or furnace) serve three purposes.

1 - When the system goes into defrost, the strips come on to keep warm air flowing, because in defrost mode the heat pump actually blows cold air.

2 - When its to cold outside for the heat pump to keep up, the heat strips will kick in.

3 - Emergency heat, the thermostat can be switched to emergency heat bypassing the heat pump and using only the strips.

The strips are brought on with relays, which sometimes stick or go bad.

Apparently, your heat strip relay/s are sticking open periodically and not letting the strips come on.

We can verify this with a meter. Those relays are fairly cheap and easy to replace.

Posted on Dec 22, 2008

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Check the thermostat and make sure the fan is in auto and not in the on position. Then check the filter to make sure it is clean. Then the fan control switch or limit switch could be bad.

http://www.hvac-for-beginners.com/

this link may help u regd this..

Posted on Dec 22, 2008

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