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WHAT DOES IT MEAN WHEN HEAT IS SET 66 AUX IS FLASHING

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If it is a heat pump if the ambient I door temp is not than 3 degree s lower than 66 it utilizes the aux heat ( heat strips) to help the unit achieve your desired temperature set point faster. Also the heat pump does need help if trying to overcome really cold temperatures. Once set point is achieved the heat pump should be able to keep the home at the set point without aux heat. But the flashing may just be to let you know that the heat strips are in use at the current time. See if when the temperature gets close to your set temp if it goes away. If not a heat pump it may always flash to just tell you heat strips are in use. Some homes mostly trailers only have heat strips but on heat pumps heat strips are there to help heat pump get to your desired temp. But when your heat pump can maintain the temp without the strips is where it saves power. Also heat pump thermostat hVe emergency heat settings. This scares alot of people but if your heat pump isn't working and you have to switch it to emergency heat until you can get it fixed,. That means that the system is only using heat strips and not utilizing heat pump at all. Power bill may be a little higher but remember, most trailer homes only have heat strips and if you do not use emergency heat in this situation your heat strips will only heat home 3 degrees below set point on thermostat to allow heat pump to bring it up the other 3 degrees. If heat pump isn't working correctly you will always be 3 degrees colder than what you set you thermostat at. Maybe too much info but it's prolly just your aux heat on helping system achieve the desired temp you set thermostat too.

Posted on Oct 24, 2016

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My Hunter model 44132 thermostat is flashing AUX. Why and how do i correct this problem?


When your thermostat displays "Aux Heat", this is simply a reminder that the second stage of heat is now ON. This occurs whenever the room temperature drops more than 2 degrees and activates the Second Stage of Heating (Aux Heat). This is a normal operation of your 2 Stage Heat Pump thermostat and it will not affect your thermostats performance at all.

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What does it mean when it comes on AUX heat?


The system type has been incorrectly set during the installer setup. The t/stat thinks there is auxiliary heat equipment that is controlled by a signal on the Aux-E terminal which you obviously don't have. My recommendation would be to go to the Honeywell website and download a copy of the installation guide for the FocusPro 8000 and go through the installer setup again but select the appropriate system type under setup function 1.

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2 Answers

What does it mean when the aux is flashing on my thermostat?


I assume that you have a heat pump system. If this is the case, the outside temperature is probably lower than the heat pump is sized for and it is using the auxiliary heating system to keep up. The auxiliary heating system usually is an electric coil in the heat pump unit which supplements the heat being produced by the heat pump. This is normal operations and does not indicate a problem with the heat pump, it is just really cold outside. If it is not colder than usual outside, there may be a problem with the heat pump and you should call a heating contractor to check it out.

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1 Answer

Aux heat comes on


If you turn your heat on and the temperature is set 3 degrees above what the actual temperature of the room, the auxillary heat will automatically come on. The auxillary heat is an electric heat strip that provides heat to your home while the heat pump is in defrost cycle or if there are extremely low temperatures outside. Try not to set the temperature more than 2 degrees above the actual temperature of the room. Hope this helps.

Jan 25, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

What does the "auxillary heat"


Auxiliary Heat is used to turn the electric heat strips ON, If the heat pump is not working. Or if the heat pump can't bring the space temperature up to Set Temperature it will display Aux Heat ON....... Assuming you have a Heat Pump System with Auxiliary Electric Heat as Back up...... If the tech didn't install a jumper wire from AUX to W on the subase which is in back of the Display on the Thermostat.....you won't get Auxiliary Heat if the Thermostat is set for Auxiliary Heat. Other wise the thermostat will turn the heat pump on first and then the electric heat (Aux Heat) if it needs it to satisfy the set temperature....... Hope this helps

Apr 21, 2011 | Honeywell Electronic Programmable...

1 Answer

On my thermostat which is a white-rodgers the flame symbol is flashing the heat is set to 68 but it stays on 66. I have a split unit Ruud. The problem happens at night when it is cold.


Is this a heat pump system? If so I would recommend switching the thermostat to aux. or emegency heat at night when it is cold outside. The heat pump will not keep up when the outside temperatures are real cold.

Jan 15, 2010 | Heating & Cooling

1 Answer

Temp set at 68 degrees but goes to 66 and the heat pump never shuts down has an electric aux


Depending on the outside temp. your heat pump might not keep up with the demand. It is not economical to run your heat pump in temperatures at or below freezing. Doing so could cause compressor failure and these are not cheap to replace. I would be running the aux. electric in low temps.

Dec 21, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

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 Heating & Cooling

2 Answers

Thermostat show AUX HEAT


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.

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1 Answer

TB8220U Commercial Thermostat keeps running when temp is right


the temp coming out of the vent should be 20 to 25 deg more then room temp and if AUX heat kicks in the temp should be even more.

Jan 08, 2009 | Honeywell Electronic Programmable...

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