Help with Honeywell thermostat

[THE WIDGE]

I choose the wrong day to try to change this out at over 110 degrees. Ok, I purchased a new Honeywell WiFi thermostats to swap out with my old school one. I’m attaching picture of both, I am also attaching a pic of existing wire connections. The problem I’m having is a few things. First I don’t have an existing C wire which I guess is a must. Other problems the red wire is connected to RC put I only have RH and R terminals on new one. Also the blue wire is on O, put I don’t have an O but do have OB. Yellow wire is on Y but also seems to be connected to W??? I do have a Y new thermostat but I don’t think it have a W. The G wire is good.

I did have a loose wire within harness and instruction said that could be C wire. I connected O wire to OB terminal per instructions. No power when I turned power back on at breaker.

Long story, I hooked my old one up as it got hot inside messing with this.

Hoping someone on here does these and knows the quick fix. Call center was closed.

I also have a Lois wire behind a separate plate a few inches from thermostat

Thx

 

[probablecause]

I have the same problem. Hooked up a C wire to the same thermostat but got an email notification that it was disconnected. Batteries died so C wire is not hooked up correctly. Two wires come from the C wire and I figure that since it is 24v that it does not matter how they are connected. I was wrong.

 

[DRYHEAT]

I had the same problem with mine, had to get up on the roof and wire in the c wire. Hopefully a real HVAC man can answer this for you

 

[Rbcconst]

View attachment 662369 View attachment 662373 View attachment 662373 View attachment 662369 View attachment 662371 I choose the wrong day to try to change this out at over 110 degrees. Ok, I purchased a new Honeywell WiFi thermostats to swap out with my old school one. I’m attaching picture of both, I am also attaching a pic of existing wire connections. The problem I’m having is a few things. First I don’t have an existing C wire which I guess is a must. Other problems the red wire is connected to RC put I only have RH and R terminals on new one. Also the blue wire is on O, put I don’t have an O but do have OB. Yellow wire is on Y but also seems to be connected to W??? I do have a Y new thermostat but I don’t think it have a W. The G wire is good.

I did have a loose wire within harness and instruction said that could be C wire. I connected O wire to OB terminal per instructions. No power when I turned power back on at breaker.

Long story, I hooked my old one up as it got hot inside messing with this.

Hoping someone on here does these and knows the quick fix. Call center was closed.

I also have a Lois wire behind a separate plate a few inches from thermostat

Thx

Definitely wait until you get the right info because if you cross the wires you will short out the 3amp fuse and you will be sol until a tech comes out. I’ve done it.


Sent from my iPhone using Tapatalk Pro

 

[Flying_Lavey]

Ahhhh man......
C is the common wire to power the stat. Without it the wifi thermostats do not run. You need to make sure there is a wire connected to the C terminal inside the unit. If there isn't and you have an extra conductor not being used inside the stat wire, you can connect that to the C terminal on each end.

You obviously have a heat pump since the old stat had the W and Y jumped together. So look at the letters for a "Heat Pump" on the backing plate for where to land wire. You need to make sure you correctly do the internal set-up on that thermostat so it'll work correctly.

What is the white wire connected to? It's hard to tell in those pictures?

The new stat has a jumper factory installed between the RC and RH terminals. Leave that in there and the red wire goes into either one.

Red wire to the RC or RH terminals
Blue goes to the O/B terminal
Green goes to G
Yellow goes to Y

The white is the kicker. The way it's routed with the Yellow wire there and all is very odd. If you could take a picture in the unit where the stat wire lands it could solve that issue.

Sent from my SM-G935V using Tapatalk

 

[Dalton]

Ahhhh man......
C is the common wire to power the stat. Without it the wifi thermostats do not run. You need to make sure there is a wire connected to the C terminal inside the unit. If there isn't and you have an extra conductor not being used inside the stat wire, you can connect that to the C terminal on each end.

You obviously have a heat pump since the old stat had the W and Y jumped together. So look at the letters for a "Heat Pump" on the backing plate for where to land wire. You need to make sure you correctly do the internal set-up on that thermostat so it'll work correctly.

What is the white wire connected to? It's hard to tell in those pictures?

The new stat has a jumper factory installed between the RC and RH terminals. Leave that in there and the red wire goes into either one.

Red wire to the RC or RH terminals
Blue goes to the O/B terminal
Green goes to G
Yellow goes to Y

The white is the kicker. The way it's routed with the Yellow wire there and all is very odd. If you could take a picture in the unit where the stat wire lands it could solve that issue.

Sent from my SM-G935V using Tapatalk

I think blue was his common on the old stat?

 

[jet496]

View attachment 662369 View attachment 662373 View attachment 662373 View attachment 662369 View attachment 662371 I choose the wrong day to try to change this out at over 110 degrees. Ok, I purchased a new Honeywell WiFi thermostats to swap out with my old school one. I’m attaching picture of both, I am also attaching a pic of existing wire connections. The problem I’m having is a few things. First I don’t have an existing C wire which I guess is a must. Other problems the red wire is connected to RC put I only have RH and R terminals on new one. Also the blue wire is on O, put I don’t have an O but do have OB. Yellow wire is on Y but also seems to be connected to W??? I do have a Y new thermostat but I don’t think it have a W. The G wire is good.

I did have a loose wire within harness and instruction said that could be C wire. I connected O wire to OB terminal per instructions. No power when I turned power back on at breaker.

Long story, I hooked my old one up as it got hot inside messing with this.

Hoping someone on here does these and knows the quick fix. Call center was closed.

I also have a Lois wire behind a separate plate a few inches from thermostat

Thx

I'm assuming you have a Heat Pump and not a gas furnace.

1) Connect C inside your Fan Coil with the same color wire that you connect to the thermostat (Use the white wire which isn't being used)
2) Connect Y only (don't jump to W & Y like on your old one)
3) Go into set-up of the thermostat & set for O which energizes the reversing valve for cooling (B is for Rheem units which energizes the reversing valve for heat)
4) In the set-up mode also set it for Heat Pump

 

[jet496]

Also, you should only need to connect to R (RH would only be needed if you have a gas furnace).

 

[THE WIDGE]

Ahhhh man......
C is the common wire to power the stat. Without it the wifi thermostats do not run. You need to make sure there is a wire connected to the C terminal inside the unit. If there isn't and you have an extra conductor not being used inside the stat wire, you can connect that to the C terminal on each end.

You obviously have a heat pump since the old stat had the W and Y jumped together. So look at the letters for a "Heat Pump" on the backing plate for where to land wire. You need to make sure you correctly do the internal set-up on that thermostat so it'll work correctly.

What is the white wire connected to? It's hard to tell in those pictures?

The new stat has a jumper factory installed between the RC and RH terminals. Leave that in there and the red wire goes into either one.

Red wire to the RC or RH terminals
Blue goes to the O/B terminal
Green goes to G
Yellow goes to Y

The white is the kicker. The way it's routed with the Yellow wire there and all is very odd. If you could take a picture in the unit where the stat wire lands it could solve that issue.

Sent from my SM-G935V using Tapatalk

The white wire was not being used, it was hidden behind the plate in the group of wires.

 

[jet496]

To set-up the Heat Pump:

1) Hold Fan button for 3 seconds & press Next
2) You'll see 1 on the left & use up/down arrows to adjust for a 1 on the right as well (for Heat Pump)
3) Press next and Function 2 should be 0 on the right (set-up for O reversing valve)

That's it, all the other settings are good defaults.

 

[Flying_Lavey]

The white wire was not being used, it was hidden behind the plate in the group of wires.

Use the white for your common (C wire) then. Connect it inside the fan coil, or package unit, whichever you have and then connect it to the C terminal inside the stat.

Sent from my SM-G935V using Tapatalk

 

[THE WIDGE]

So yellow to Y.
Green to G.
Blue to ?
Red to ?
What about c?
Not sure what White is as it wasn’t being used

 

[jet496]

Connect white wire to C & connect it inside your fan coil

 

[THE WIDGE]

Connect white wire to C & connect it inside your fan coil

I conrcted White to C but nothing worked. Where is fan coil, is that up on the roof with ac

 

[TrollerDave]

I conrcted White to C but nothing worked. Where is fan coil, is that up on the roof with ac

Was the A/C working with the old stat?
You might want to hook up the old stat until we can talk you through this or you get someone out.
edit: just saw you did hook up the old one.
Do you have just one unit the roof(big square package unit), not a 2 part system (split system)?
Yes the white at the C will have to be connected to the C at the circuit board in the unit, if it has one.
Red wire goes to the R, blue wire will got to the O/B terminal on the stat.

Once it is wired up correctly, then it will have to be programmed correctly.

 

[jet496]

I conrcted White to C but nothing worked. Where is fan coil, is that up on the roof with ac

It's either a packaged unit on the roof but most likely it's a fan coil in the attic or a closet. Either way, you'll see the thermostat wire going into it & that's where you need to connect the white wire to C.

Unplug the unit when you do it to ensure not shorting anything out

 

[Faceaz]

I recently installed an Emerson wifi unit at our Parker place. An a/c buddy that really know his shit helped me through allot but there was 1 wire, don't recall which that was questionable. I ended up calling customer service:. They asked me the old thermostat model & where wires were landed, etc. Took her about 2 minutes - told me exactly which wires went where & walked me through settings. Had it up & running in no time. Love being able to turn down the AC before heading out.

 

[MohavValley]

Not sure how old your furnace/air handler is but post up a picture of how the wires are connected at the furnace/air handler and that'll determine how the thermostat needs to be hooked up.

A by the book wiring is set up like this:
Blue: common
Yellow: cooling trigger
White: heat trigger
Red: 24v from transformer
Green: fan
Orange: heat pump

But you didn't specify what type of system you have or how it was wired at the finance or air handler if you have a heat pump.

 

[F.U.IRS]

I installed the same thermostat about a month ago in an old trailer I have in Havasu. There was no c wire on the old stat. I found a 24 v wire and T'ed off of it,but ot didnt work.According to Honeywell it has to be a dedicated wire ,not shared. I got a external 24 vac transformer ran it to the c wire location on the stat and bingo it worked

 

[ghansen]

I have that thermostat hooked up to our Heatpump in Bullhead. Works great. I had a Nest thermostat that was nothing but problems.

 

[ghansen]

You’ll really like the app to use it.

 

[Rondog4405]

View attachment 662369 View attachment 662373 View attachment 662373 View attachment 662369 View attachment 662371 I choose the wrong day to try to change this out at over 110 degrees. Ok, I purchased a new Honeywell WiFi thermostats to swap out with my old school one. I’m attaching picture of both, I am also attaching a pic of existing wire connections. The problem I’m having is a few things. First I don’t have an existing C wire which I guess is a must. Other problems the red wire is connected to RC put I only have RH and R terminals on new one. Also the blue wire is on O, put I don’t have an O but do have OB. Yellow wire is on Y but also seems to be connected to W??? I do have a Y new thermostat but I don’t think it have a W. The G wire is good.

I did have a loose wire within harness and instruction said that could be C wire. I connected O wire to OB terminal per instructions. No power when I turned power back on at breaker.

Long story, I hooked my old one up as it got hot inside messing with this.

Hoping someone on here does these and knows the quick fix. Call center was closed.

I also have a Lois wire behind a separate plate a few inches from thermostat

Thx

Thank the lord you posted this thread.. I bought the same stat last year and just got wifi at the pad.. Been dreading this install! Especially now that its a hot af out there . Great info guys.. Ill be installing in 2 weeks.

 

[Keymyster]

Friend is having a problem connecting his Honeywell up also.

 

[THE WIDGE]

Carey should be coming by tomorrow to install. I spent too many hours yesterday messing with it. Thank god i was able to install old one in this heat on a Sunday. Tomorrow is last day on the water for this trip, so I figured I’ll have a pro take care of it and get on the water, rather than screw something up and not make it on the water

 

[LHC Kirby]

I had a talking thermostat (telephone activated) I switched to this one last trip. easy switch over, sorry no photos - I just followed directions in the package (I KNOW, a guy who actually reads the directions..right?) it all worked out, after two failed attempts BEFORE reading the directions lol.

 

[Deja_Vu]

Mine is still sitting in the box. LOL Now I think I will wait till October to install it.

 

[Taboma]

I installed the same thermostat about a month ago in an old trailer I have in Havasu. There was no c wire on the old stat. I found a 24 v wire and T'ed off of it,but ot didnt work.According to Honeywell it has to be a dedicated wire ,not shared. I got a external 24 vac transformer ran it to the c wire location on the stat and bingo it worked

Just to clarify so some other HVAC "do-it-yourselfer" doesn't misunderstand what you wrote here ---- Did you mean to say you used the Hot and Common (C = neutral) from this added transformer ? Because simply using a single common wire from a transformer has never before accomplished anything electrically speaking.

 

[probablecause]

All I have is a heater (furnace) in Big Bear - Lux Products GEO-WH Wi-Fi Thermostat. Since I want to install a C wire, does it go to the C and RH? Instructions are very vague on this. I don't have A/C, heat pump, and all of the rest. Just a basic furnace.

 

[240Hallett]

For older systems that don’t have the C wire there are thermostats available that don’t require it.

 

[F.U.IRS]

Just to clarify so some other HVAC "do-it-yourselfer" doesn't misunderstand what you wrote here ---- Did you mean to say you used the Hot and Common (C = neutral) from this added transformer ? Because simply using a single common wire from a transformer has never before accomplished anything electrically speaking.

Yes,used both wires

 

[jet496]

All I have is a heater (furnace) in Big Bear - Lux Products GEO-WH Wi-Fi Thermostat. Since I want to install a C wire, does it go to the C and RH? Instructions are very vague on this. I don't have A/C, heat pump, and all of the rest. Just a basic furnace.

No. Just the C. You would blow your transformer if you connected to RH which is typically Red & the hot 24 volt wire.

 

[probablecause]

Just to confirm that both wires coming off of the 24v transformer (wall plug) are hot?

 

[Rondog4405]

Mine is still sitting in the box. LOL Now I think I will wait till October to install it.

Mine too! Too damm hot to shut down the power and break shit! .. Mighy wait as well

 

[THE WIDGE]

Well worth the call to Carey's ac, got it hooked up, inspected ac. Now programming had a few problems. I had to wait on hold with Honeywell for over an hour, stat wasn't connecting to wifi and the id number was reused and guy had to erase it from previous. Long story short I'm good now. Wish I had just called Carey in the first place rather than tackling it on a Sunday in 114 temp. Thx all for the info

 

[Deja_Vu]

Well worth the call to Carey's ac, got it hooked up, inspected ac. Now programming had a few problems. I had to wait on hold with Honeywell for over an hour, stat wasn't connecting to wifi and the id number was reused and guy had to erase it from previous. Long story short I'm good now. Wish I had just called Carey in the first place rather than tackling it on a Sunday in 114 temp. Thx all for the info

Glad you got it all sorted.

I plan on calling Carey for my garage mini splits this winter.