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I have a Honeywell thermostat. What does “Auxiliary Heat On” mean?

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If it's a heat pump, it means you either bumped the heat up to a temp that the heat pump cannot reach quickly OR it's so cold out that there is no heat for the heat exchanger to pull from the air outside.
Both conditions turn on the heat strips in the air handler. The heat strips are your 'auxiliary heat.'

Posted on Jan 01, 2018

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: heat pump auxiliary heat does not turn on

Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.

Posted on Nov 30, 2008

Anonymous

  • 334 Answers

SOURCE: I replaced my Janitrol 7

There should be electric heat strips in the airhandler.

They automatically come on when the unit goes into defrost, the thermostat is turned up more than 7 degrees over the indoor temp or if the outdoor temp is just so cold the HP cannot keep up.

Tat is your auxillary or emergency heat.

What does the new t-stats installers booklet say that the 0170 function and #2 #7 options are for?

If it is for gas vs elec heat then set it on the elec option.

The difference is that in gas heat systems the blower comes on a few min AFTER the furnace fires up to allow the heat exchanger to get hot.
In an electric furnace the blower has to come on emediatly because the heat strips get hot emediatly and if the blower is delayed the system will shut of in high temp overload.

Posted on Dec 18, 2008

HANK MCNEIL

  • 252 Answers

SOURCE: need wiring for honeywell pro 3000 in trane xe1200

the pro 300 is a single stage thermostat and can not be wired to control 2 heat stages seperately

Posted on May 16, 2009

HANK MCNEIL

  • 252 Answers

SOURCE: HONEYWELL T87N 1000 ROUND THERMOSTAT

the power for that stat comes from the furnace - if you have no display on the stat you have a furnace problem

Posted on Sep 28, 2009

rustybob11

Robert Rust

  • 1 Answer

SOURCE: HONEYWELL RTHL2310/RTHL221 THERMOSTAT AIR WILL NOT COMEON

I had the same experience connecting to my Carrier Weatherbeater furnace and AC. My old thermo LUX?? died and I replaced it with RTHL3210 last November. The heat worked. This week I found the cool didn't work. After much screwing around, I found the Yellow to Black connection to the AC read only 17 ohms! The POOR Honeywell couldn't drive the load. It could handle the 500 ohm Heat connection.
I am ordering a LUX thermo; they actually SPEC 1.5A per connection or 2.0A total! I long fro the olden days when a mfr actuallly provided TECHNICAL information. Not just marketing hype to peddle something.
SHAME ON HONEYWELL FOR NOT REVEALING THEY HAVE A FEEBLE OUTPUT CAPABILITY.

Posted on Mar 14, 2013

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1 Answer

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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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

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1 Answer

I'm installing a Honeywell Thermostat RTH2410. In Step 1 you need to identify the system type. I have a Carrier Heat Pump model FA4BNF030. Is this a heat pump with or without auxiliary/backup heat?


Auxiliary heat is electric heat that is put into the air handler on the inside of the house. Its used when your heat pump doesn't provide enough heat, but heat strips are not always used. To see if you have auxiliary heat, look inside and see if you have breakers on the front panel of the air handler or anywhere close. No breakers, no electric heat. Hope this helps!

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I have a Trane heat pump, model #TWP060C300A and a Trane air handler, model #TWE065E130A. Heat pump is 5.0 ton, split system. Air handler has a variable speed motor and a 20Kw 3-phase auxiliary heat strip....


Honeywell Chronotherm thermostats have always had a great reputation for longevity and reliability. They are also much more user-friendly than the other types of programmable thermostats out there. Make sure you get one that states 2-stage heat, heat pump. T8611G will offer that for you. There are many out there that claim to be suitable for heat pumps; however, they do not have the ability to utilize your auxiliary heat strips (2nd stage of heat).
Before you attempt to replace, be sure to write the wire colors and their corresponding terminal marking on a sheet of paper........of your old thermostat. This is very important to make it easier to hook up the new thermostat. Also, before you disconnect the wires, be sure to shut off the circuit breaker to your air handling unit. You can ensure you have the right one by putting the fan switch in "ON". When you turn off the right breaker, the fan will stop running. :-)

I hope you find this information to be very helpful to you. Please don't forget to leave a rating.

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1 Answer

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Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.

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