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I have a Honeywell RTH2510 thermostat for a heat pump. It now shows the "aux on" display. I know it will cost me hundreds of dollars if I cannot it turn the "aux on" off. How do I do that? Thanks, Ted

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: thermostat says ''Aux heat on'' and buzzes when we turn on heat

You most likely have a heat pump, the aux heat (usually electric) comes on anytime the room temperature is 4 degrees below the thermostat setting. Does the buzz go off when the aux heat lite goes out? If the aux heat does not shut off then the primary heater (heat pump) is not putting out enough heat to satisfy the thermostat. I need a little more info. Do you have a heat pump? Is it working?

Posted on Nov 26, 2008

Accurate Joe
  • 61 Answers

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

meBNme
  • 334 Answers

SOURCE: 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.

Posted on Jan 23, 2009

  • 1 Answer

SOURCE: heat pump works in emergency heat, but not in auxiliary heat

I set the thermostat for 70 degrees. It comes on always in auxillary heat and does not shut off when it reaches 70 degrees. It is a heat pump, I am assuming, it might be the thermostat? But when the air conditioner is on, it turns off when it reaches it's temperature.

Posted on Oct 16, 2009

  • 767 Answers

SOURCE: what does aux mean on a honeywell Thermostat?

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.

Posted on Dec 11, 2009

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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...

2 Answers

I have a honeywell rth2510 thermastate how can i change from celcious to farenheit


here is a download for the manual on page 12 and 13 in English.
http://customer.honeywell.com/techlit/pdf/PackedLit/69-2380ES.pdf

Press the up and down button simultaneously from a few second till display changes and then on #1 set it to option 1 and that show be C.

Feb 21, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Removed my non programable Honeywell RT 5220D replaced it with a Honeywell RTH6350D to run my Goodman Heat Pump. First I labeled the wires then connected wires as follows: AUX, G, C, O/B (orange wire)...


Leave the factory jumper between R & RC. Connect the wires to the new stat just as you have them labeled. Use a piece of thermostat wire to make a jumper from AUX to E terminals. Your new thermostat should give you instructions on how to access the installer set up. You are going to set it up as heat pump with aux. I see this is 2 days old but if you need any help let me know.

Feb 13, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

I bought the rth2510 to replace an old dial one and i need help wiring it up there are only 2 wires that ran the old one, where should i put these in the new one. A black wire and a white wire?


Wow, you bought one hell of a thermostat to run just a heater...lol. Your going to place on wire on R and 1 wire on W/AUX. R is your common power in and W/AUX is for a single stage cooling unit.

Sep 28, 2010 | Honeywell Heating & Cooling

1 Answer

Replaced Bryant T-stat model TSTATBBNB001 with Honeywell t-stat


Your original wiring configuration seems to indicate that you have an air conditioner (not heat pump) and either a gas or electric furnace. If this is the case you may need a different thermostat for your application.

Apr 21, 2010 | Honeywell Heat/Cool Thermostat

1 Answer

Heater running continuously


Sounds like you have a problem with your heat pump. Your aux heat is a electric coil. how old is the unit when was the last time it was serviced? How cold is it out side?

Jan 15, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell RTH3100C


You need to go into the installer setting to change it from heatpump to single stage gas heat.Go to www.honeywell.com if youve lost them.

Dec 13, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Thermostat says ''Aux heat on'' and buzzes when we turn on heat


You most likely have a heat pump, the aux heat (usually electric) comes on anytime the room temperature is 4 degrees below the thermostat setting. Does the buzz go off when the aux heat lite goes out? If the aux heat does not shut off then the primary heater (heat pump) is not putting out enough heat to satisfy the thermostat. I need a little more info. Do you have a heat pump? Is it working?

Nov 19, 2008 | Honeywell Electronic Programmable...

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