Question about GE Zoneline AZ55H09D Air Conditioner

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Thermostat show AUX HEAT

My luxpro psd111 thermostat shows aux heat and is not warming the house. I've replaced the batteries and filter, to no avail.

What does it mean when it shows AUX HEAT?

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A heatpump has two sources of heat. One is when the heatpump is operating in normal heat mode, and the other is typically electric heat strips.

The strips come on when the unit is going into defrost, when the unit is not able to keep up with the demand for heat (really cold temps) and when the unit is not working properly.

Whne the strips are on, the T-stat displays "aux-heat" to indicate the strips are in operation.

If the strips are working properly you should have warmer air than with the HP alone. Try switchin it from "heat" to "emergency heat" and see what it will do.

When the HP is not able to keep up with the demand for heat then the heat strips come on, but they typically come on only when the room temp has gotten well below the thermostat setting.

In that situation it would be normal to see indoor temps at 63 degrees when the T-stat is set on 70.

But when you set it to E-heat it bypasses the heatpump operation and goes directly to the heat strips. If they are working properly it should maintain an accurate temp in the home.

Posted on Jan 23, 2009

  • corey_blaine
    corey_blaine Nov 30, 2012

    You my friend, are a well-educated professional heat-pump response giving master. Many thanks.

  • corey_blaine
    corey_blaine Nov 30, 2012

    You my friend, are a well educated heat-pump response giving master! Many thanks.

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It means you have a heat pump and the primary system is not working properly or it cant keep up so it turns on aux heat if it is could i suggest putting it on emergency heat and that should heat your house until you can have a sevice man check it out as heatpumps can be complicated

Posted on Jan 23, 2009

  • jackiejj Oct 29, 2010

    I had same problem when first switching to heat after summer a/c; I switched the unit to emergency heat and then back, and the system went to "heat" instead of "aux heat."

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