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Changing home thermostat

Changing thermostat from a 2 stage to a 4 stage to run elec.heat heatpump air humidifier the thermostat is a white rodgers big blue need wireing diagram

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Couldn't find your thermostat based off the information you provided; find the model number and follow the link to the Contractor Support Page.

White-Rodgers Multi-Stage Thermostate Diagrams for Contractors

Posted on Nov 28, 2008


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Posted on Jan 02, 2017


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Wiring instruction for a White Rodgers 1F78 non-programable thermostat.

The White-Rogers 1F78 thermostat is a single stage 5/2 day programmable thermostat. Home Depot has the manuals for one model of this thermostat, 1F78-151, on the product page: . The wiring diagrams are in the Installation manual. The direct link to this manual is . Emerson Climate also has the wiring diagram here: .

If you have a different White-Rodgers 1F78 thermostat, check for the manual at Emerson Climate by starting at . Click on the Enter Model Number button and start typing in the model in the search box. I found a number of models with 1F78 listed. After selecting a specific model, I found a link to the installation guide on the left side of the page, below the search box. (Note: the manual link was above the Suggested Replacement header for the models that I checked.)

I hope this helps.

Cindy Wells

Dec 15, 2017 | White Rodgers Home Security

2 Answers

Need help understanding how to wire a new programmeable thermostat. I currently have a White Rodgers 1F73 model (non-programmeable) connected. I am confused with the instructions on how to connect the...

the black wire is your common wire, you need to program your thermostat, in the advance mode, to tell the t-stat if your heat pump reversing valve is energized on cooling or heating, is the orange wire connected to your t-stat.= w2/o/b

Dec 20, 2014 | Honeywell Heating & Cooling

1 Answer

We have bought a home with the wite rodgers thermostat 1f85-275 it doesn't seem to be working. on the top right of the screen it states 1&2 stages? anyway, help would be appriciated

Hi, this thermostat is for central heat and air systems that have more then 1 stage of heating or cooling. For example, your unit may have 2 stages of cooling, as in 2 compressors, or 1 stage of cooling and 2 stages of heating as used in commercial heat pumps. This is a multi-stage heat pump thermostat. It may be just a matter of programming the stat. If you can find a manual on it, this would help. If you open the cover, it should have directions on how to program it.Make sure you have power to everything, check all breakers to see if they may be shut of, even if you have a display, doesn't mean you have high voltage to run the unit. Make sure fan is in auto, and on heat or cool, and temperature set for it to come on. Please keep me posted.
A/C, Heating Contractor
PS Your unit has 1 stage of cooling, and 2 stages of heating.

Nov 05, 2010 | Heating & Cooling

1 Answer

Model 1f90w-51 the up down buttons stopped working this is a white-rodgers

Electronic Digital Multi-Stage Thermostat 1F83-261

  • 1F83-51 - White Rodgers Installation and Operating Instructions Thermostat 1F83-51
  • 1F86-344 - White Rodgers owners manual Thermostat 1F86-344
  • 1F86-444 - White Rodgers Installation and Operating Instructions Thermostat 1F86-444
  • 1F87-251 - White Rodgers Thermostat 1F87-251 OPERATION INSTRUCTIONS
  • 1F87-51 - White Rodgers Installation and Operating Instructions Thermostat 1F87-51
  • 1F89-11 - White Rodgers Installation and Operating Instructions Thermostat 1F89-11
  • 1F90-51 - White Rodgers OPERATION GUIDE Thermostat 1F90-51
  • Hi, This is a good stat and I have used it alot in the past as it is a older model. If you have 24 volt control voltage at the stat, and the battires are good, then you have a malfuntion in the ciruitry and will need to replace it. I have sent you a ton of manuals on there products I thiught they may be helpful. Please dont forget to rate this post as I know you will be kind. I hope I have been of help to you.
  • Sincerely,
  • Shastalaker7
  • A/C, Heating Contractor

Sep 22, 2010 | Heating & Cooling

1 Answer

My air conditioning has stopped working and i wonder if it has something to do with my emerson thermostat. the thermostat is reading ''system on +2''. the unit usually reads ''system on'. could this be an...

“System On” indicates when heating or cooling stage is energized. “System On +2” indicates when a second stage is energized. This means that the thermostat is sending the correct signal to your AC equipment to run but your unit is not responding on the call of the thermostat, Most of the case this is a system issue not the thermostat, you need to contact your installer to resolve the problem.

Jul 08, 2010 | White Rodgers White-Rodgers 1F85RF-275...

2 Answers


It's a little unusual to add a humidifier in Florida. The ambient humidity is usually high enough.

But anyway, if you want to do this and assuming you have central air with forced air heating, you could install the humdifier in a standard configuration, then use a sail switch or differential pressure switch in the supply air duct to turn the humidifier off or on when you are in the heating mode only. The sail or differential switch will ensure that the unit can't run unless air is moving and you can tie the humidistat in to the first heat stage.

Mar 05, 2010 | Honeywell Power Humidifier: Furnace...

2 Answers

No Heat with new White Rodgers 1f85rf-275 Thermostat

My name is Tim Burke from White-Rodgers. If you hear the "click" the thermostat is calling. It would appear that their is a wiring issue to the funace. Please contact our customer service toll free hot line and they will be happy to walk you thru it and assist you. 877-978-7828


Oct 19, 2009 | White Rodgers White-Rodgers 1F85RF-275...

2 Answers


Heat pump Thermastats have Terminals RYW/OW2 G C. I run into this a lot with people buying tStats at home depot. To wire three sages of heat you must have correct tstat. one stage cool and three stage heat. You have to have enough wires at the Tstat. I use white first stage brown second and grey or black third. Make a diagram where each wire goes. Remember to trun of air handler power or you will short the transformer or blow low voltage fuse. Yellow cool, green fan, most of the time blue is c unless it is a battery tstat. orange is O. Red R ot power wire. Rusty

Jun 03, 2009 | Heating & Cooling

1 Answer

Changing to a digital thermostat

you cant use this thermostat . you have a trane 2 stage heatpump the hunter thermostat is made for a one stage heatpump ...if this answer helped please rate this 3 or 4 stars , this will keep me in the paid answer department

Apr 06, 2009 | Heating & Cooling

1 Answer

Cannot reach the temperature setpoint in heating sequence

I think what you are trying to ask is should you use a 2 stage thermostat or stick with a single and just double the stages on a relay to work at the same time. As long as the relay can handle the amp load, there is no real need for a 2 stage heat system, unless you are concerned by the efficiency of $$. If I am missing the question please reply.

Dec 11, 2007 | Ruud UBHC Air Conditioner

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