Question about Honeywell Programmable Thermostat Heater

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Thermostat honeywell does my digital thermo automatically change from heat pump to electric/emergency heat

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  • hark76 Dec 09, 2008

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If installed the right way it should!

Posted on Dec 08, 2008

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1 Answer

I have a thermostat RTH9580. Why do I have emergency heat under system AND heat which sometines switch automatically to auxilliary heat?


If you have an air to air heat pump, in colder temperatures, the heat pump will not heat as well as it would in warmer outdoor temperatures making it run longer. the digital thermostats work off of a built in algorithm that kicks on the auxiliary heat when the heat pump runs to long so that it will satisfy the thermostat quicker. This can be tied to the Emergency heat @ the thermostat energizing a few heating elements, or just energizing a separate element from the emergency heat. I always recommend on an air to air heat pump to run the emergency heat when you have consistent Outdoor temperatures below 20 degrees F because you will cycle the heat less by getting hotter heat making life more comfortable, and it costs about the same as running the heat pump since @ those temperatures, it will run all the time.

Jan 09, 2015 | Honeywell 7 Day Touch Screen Programmable...

1 Answer

I do not have a manual for my thermostat


You have a heat pump unit most of the time the unit will operate in normal mode heat setting on your thermostat but when the temp of house can't keep up the emergency heat will kick in. With that being said you can switch the t-stat to emergency mode and that will take the heat pump out of action and bring in the back up heat. You might have electrical heat strips or maybe a fuel such as natural gas or propane. hope that answers your question Ken

Jan 07, 2014 | WHITE-RODGERS DIV White Rodgers 1F97-1277...

1 Answer

I have a York Unit and a Honeywell thermostat. Our unit froze up and I was told to activate the emergency heat. I did this, what does this heat do? I mean how does it work? When do I set it back to...


by going to emergency heat you have shut off your heat pump and turned on a back up source,either gas or electric, if its cold out,35or less ,just leve your emergency heat on till it warms up a bit

Jan 10, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

I understand the heat pump is only efficient when outside temps are above about 32 degrees. If temps are lower, what do I need to do to switch from heat pump source?


If you have electric auxiliary heat strips you do nothing. The system brings on the heat strips as needed.
If you have gas or fuel oil the system brings that on as needed also.
If you switch to Emergency(AUX) heat you will eliminate the heat pump. Not a good idea if you have electric backup heat.

Jan 05, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Programmable Thermostat Heater: no power to honeywell central heating control...


Multiple possibilities:
Damage to cable (doing any DIY?)
Failure of thermo
Board gone in heat unit
Possibly simple as loose or disengaged connection, check at thermo & heat unit, if nothing obvious, call serviceperson.

May 18, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Wiring diagram to connect programmable Thermo to Heat Pump


I don't know if this will be helpful or not, but I just installed a new Honeywell and the Honeywell customer service guy helped me get the wires done correctly. The number is 800-468-1502.

Jan 05, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

Heat pump that just blows cool air


is the condenser operating? what is the outdoor temperature? A heat pump is a cooling system with a reverse gear, most reversing valves which make this possible fail to the heat mode so it is not likely to be the problem. You should have either gas or electric back-up heat. If you switch to emergency heat do you get warm air? Really need to find out more to make an informed guess at your problem, the simple stupid would be is the circuit breaker to the condensing unit possibly tripped or shut off?

Dec 18, 2008 | Honeywell Programmable Thermostat Heater

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