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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What is the size of the filter which it is recommended to change it yearly.


thermostats do not use filters .check any local home improvement store or heating /cooling contractor

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Is this Heat pump? if so what are the outside temperatures?
If heat pump there are controls connected to the thermostat that may at about 40f stop the heat pump, and switch to aux or emergency heat. If the aux is Electrical heating coil, you may not have power to the relay for the Electrical coil. If the Aux heat is gas, there is a problem with the controls. If none of the above are true, I would suggest your programable thermostat is calling for a lower temperatue at 8pm. I know termostats are not fun to program. It will take you some time to learn how, if you have the owner's manual. otherwise find the manual, learn, find a friend or family menber that knows how. Last resort change thermostat to non programable or have heating tec come by and help. Make sure everything else is ok in the heater.

Feb 27, 2015 | Filter Air Conditioners

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What does aux mean on a honeywell Thermostat? the heat doesn't seem to be working but warm air is comming from the vents and the heat pump fan is spinning just not enough to match the temp. it's set too....


The aux switch is for electric heat banks installed in the air handler. Depending on the outside temp. it may not be efficient to run in heat pump mode but in aux. or emergency would run the electric heat in the air handler.

Dec 11, 2009 | Goodman Air Conditioners

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What's the difference between EM HEAT and AUX HEAT?


Sorry, neither of these answers are completely correct.
You have a heat pump (or the wrong thermostat). Let's assume you have a heat pump.

In air conditioning mode, it works like every air conditioner you have ever had, but...

In heat mode, it reverses its operation. Have you ever felt the air coming out of the outdoor unit of your A/C unit? It's hot, isn't it. And the air coming out of the indoor unit (out of the registers) is cold. Now for a heat pump to produce heat it simply runs the air conditioner in reverse and the heat comes out in the house and the cold is released outside. Neat, huh!

Here's the problem with heat pumps...when it is really cold outside the heat pump can't produce enough heat to heat your home. So it has an additional heat source called "Auxiliary Heat". This heat comes on automatically when the house doesn't get warm enough. The source of this heat is based on the region of the country you are in. North/Northeast generally have oil heat, other regions have gas, and still others have to use electricity to heat. In Texas, we usually use electricity as the supplementary heat on heat pumps. VERY EXPENSIVE!

Now the "Emergency Heat"...this is exactly as stated in Solution #2. This is manually turned on by YOU at the thermostat when your heat pump fails. This turns on the auxilliary heaters and turns off the heat pump (remember, the reverse air conditioner). Again, this can be quite expensive to run if your heat source uses electricity! Gas and oil may be cheaper. The emergency heat is only designed (normally) to keep the house livable (not comfortable) until the Heating Tech can get out to you and fix your heat pump.

Something else you should know. It is normal for a heat pump's outdoor coil to frost up during heating mode. It will detect this and go into DEFROST mode and melt the frost off the coil. While it is doing this, it will turn on the auxilliary heater to keep the air blowing in the house at a reasonable "warm" temperature, but it will not be as hot as normal. In fact, heat pumps produce a lower temperature heat than traditional heaters. So the air may feel cooler during heating than you are use to anyway. This is normal and is not a sign of a problem.

So what do you do: Set your thermostat to the temperature you want and set the controls for HEAT/COOL and FAN-AUTO/ON and leave the EMERG HEAT off unless your heat pump breaks.

As always, keep your filters clean and your outdoor unit's coils clean and free of debris.

Hope this explains your question for you!

Oct 16, 2009 | Ruud Central System Air Conditioner

1 Answer

Replacing TSTAT for my Goodmans 3 ton heat pump. Only question I have is optimal setting for AUX heat CPH .. I think 5 or 6. ????


5 will be the most economical CPH means cycles per hour . So the thermostat will only let the heat strips come on 5 times a hour. You should not need the aux heat except on the coldest days.

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My Honeywell thermostat T874R is showing the EM heat indicator light when I turned the AC on for the first time this season--Why? House is warm but not humid.


The T874R thermostat should be a heat pump thermostat. EM means emergency heat which you obviously are not using. That means that you just need to determine if your heat strip is on while you air conditioner is working. If so you may need to replace your thermostat or you heating relay or sequencer.

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