Question about Goodman PHKJ048-1 Air Conditioner

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My Aux heat seems to run all the time.

I have a Janitrol Heat Pump with Aux electric heat. Recently the Aux heat seems to run all the time.

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  • Keith Miller
    Keith Miller May 11, 2010

    what is the outdoor temp some units will switch to aux heat when outdoor is to cold if not does your unit have a new air filter for proper air flow and heat recovery.

  • dwkcool May 11, 2010

    take a thermometer and put it in a air supply vent ,turn the heat on and watch the temp and see if the temp goes up when the aux heat kicks in if not the aux relay or sequincer is not working

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Is it cold enough in your area to lock out the heat pump?If the heat pump isnt operating correctly the aux heat will come on then too.

Posted on Jan 04, 2009

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Aux keeps coming on on regular heat is there something wrong with heat


See if it happens only when your temperature of the room is more than 3 degrees of your setpoint temperature. Since you have a heat pump, the auxiliary (electric heat strips) is use for backup of the heat pump when it can't keep up. The heat pump will run by itself if it can maintain temperature within a couple degrees. If it is too cold outside to handle the load or you set the temperature more than 2 degrees past room temperature, the auxiliary will turn on. The thermostat has a memory of how long it takes to reach desired temperature. If it goes into auxiliary mode trying to satisfy setpoint during the last call for heat, it will start the next call for heat in both aux & heat pump mode until the thermostats algorithm (timed program) allows only the heat pump to run. Not sure if you have an air to air, or geothermal heat pump. The outside air temperature will affect only the air to air system ie. when the temps drop outside, the heat coming out of your vents will be cooler...the air to air systems drops efficiency when the outdoor air drops.

Nov 08, 2013 | Honeywell TH3210D1004 PRO 3000...

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Hello, I have a rbha-17 electric heat system. My


the orange or blue wire should go to the heat pump and energize the reversing valve and the compressor should be running when the heat pump is on. All it does is reverse the flow of refrigerant and pull btu's from the outside air and deliver them to your house. Check to see if your aux. heat is coming on with the heat pump. If it is electric furnace, this will help explain why your bill is so high.

Jan 13, 2010 | Ruud UAMB042 Air Conditioner

1 Answer

Every time my heat pump turns on, the blue auxilliary light comes on, and it only blows icy air. I do not want to use that much power, so I turn it back down a few degrees. Now, it is 50 degrees in the...


A heat pump starts losing efficiency below 30F or so. The aux. heat helps the heat pump keep up with heat demand. The Aux heat can be electric heat strips or another type of heat. Check to make sure you have power to whatever type of aux heat you have (breaker not tripped, no overloads tripped). If it is electric heat check the heat strips to make sure they haven't burnt in to. Hope this helps.

Jan 10, 2010 | Amana PTH123B25AJ Heat Pump Air...

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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

4 Answers

Abbreviation definitions.


Economy Mode = EM
Auxelary Mode = AUX
in em mode heat pump does most of the work in aux either an electric heating element is used or gas depending on if it is gas or all electric

Oct 16, 2009 | Ruud Central System Air Conditioner

5 Answers

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

2 Answers

18 year old Janitrol Heat Pump freezing up.


i would get someone to check your refrigerant levels have you ever had the evaporator coil flushed and cleaned? proper refrigerant levels and proper airflow across coils are extremley important not to scare you but 18 yrs is a long time on a heat pump 9-12 years is the point where they really loose there efficiency going for a newer one would probably cut your operating cost in half if not more depending where you live there are a lot of people not familiar with heat pumps so i suggest finding a company that specializes in them to service your unit

Jul 30, 2009 | Ruud UBHC Air Conditioner

2 Answers

Trane Weathertron XE1000 Thermostat Wiring


Check to see if you have the system switch accidently on em. heat. The way you have it wired is correct except for the having brown on e. disconnect brown wire and cut ofbare end just in case they have the wire hooked up for constant run on roof.

Feb 08, 2009 | Air Conditioners

1 Answer

We recently bought a new house (to us). It has a Goodman heat pump and Goodman Electric backup furnace(A36-15) with a Janitrol stat. I switched the stat to emrg. Heat when the temp got below...


If you have a volt meter, check to see if you have 24 volts coming from the thermostat on the yellow wire.

If you do, and it is set on emer heat, you have a bad T-stat.


It looks like it is wired properly.

If you have no meter, you could try changing the stat, I reccomend Honeywell or white rodgers.

Let me know if you eliminate the Tstat as the problem and we can go from there.
Chances are its the stat.

Dec 06, 2008 | Air Conditioners

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