Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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We replaced an old thermostat with a newer model and all of the wiring seems to be correct yet the unit is heating when it should be cooling. How do you correct this problem?

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MAYBE YOU CROSS THE WIRE

Posted on Jul 02, 2008

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MY WHITE ROGERS THERMOSTAT DOES NOT HOLD THE TEMPERATURE AS DIRECTED. I COME HOME FROM WORK AND TEMP. IS 5-8 DEGREES BELOWW SETTING . I TURN IT OFF AND BACK ON AND IT WORKS FINE. THIS DOES NOT HAPPEN EVERY...


Your post didn't mention the Tstat model, if it is new or existing, what if anything might have changed near the tstat (new appliance, ceiling fan in the area) and so on. If it's new and wired correctly and the old one worked fine in the exact same mounting location, then it could be as simple as a defective tstat. If it's existing it could still be defective. On simple systems the tstat control lead for cooling turns on the condensing unit outside and the air handler inside, while the heat control lead on a non-heat pump unit turns on the air handler and heat strip. Newer systems split up the inside and outside units and control them separately to be more efficient. I don't know if you're having an issue with the heat or cool mode. If it's not the tstat then you will likely need to have a trained professional evaluate your system for system issues. Home depot carries Honeywell which Trane uses in their residential systems. Smart tstats are appearing now and while they have their advantages, putting one in an old system would be like putting a new Porsche engine in an old car with the original legacy transmission, so to speak.

Dec 06, 2014 | Heaters

1 Answer

Need to know correct color wiring from goodman model gph1330h41 with heat kit to honeywell model th5220d thermostat. Thanks


here is the wiring from man. f you have trouble figuring out the programing or what terminals to use in thermostat there is an help phone number. Be shure to turn off all power to unit and thermostat, remove batteries from thermostat.


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May 12, 2014 | Honeywell Electronic Programmable...

1 Answer

My ac unit wont turn on or off after i changed the thermostat


Sounds like it isn't wired correctly. Check wiring diagram that came with thermostat. Also check to be sure thermostat is for both heating and cooling.

Jan 26, 2010 | Honeywell Electronic Programmable...

1 Answer

I have a coleman Evcon model AH16-0 . I am


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Jan 06, 2010 | Heaters

1 Answer

I Have a honeywell RTH2410 Thermostat I wired it without the blue wire which used to go to X on my old thermostat. Now it comes on with aux heat all the time and I have a Heat Pump. How can I fix this?


What was the old thermostat labels and the wire colors that went to them?
The typical heatpump wiring Terminals are:
R = Red = Hot side of Transformer
C-B-X = Common side of transformer Depending on brand of heatpump
Y = Yellow = Cooling Contactor
G = Green = Furnace Blower
O = Orange Reversing Valve Energize to Cool
B = Blue Reversing Energise to Heat Depending on brand of heatpump.
W2 = White = Auxiliary Heat
You need to be sure where each wire comes from when you connect them to the new thermostat.
The best way to do that is to go to the furnace and see where they are connected. R-Y-G are probably correct, you need to see where the Blue wire comes from and determine what the X terminal was on the old thermostat.

Dec 29, 2009 | Honeywell Electronic Programmable...

3 Answers

Honey friedrich replaced with a honeywell RCT 8100


on some of the older models you must go into the installers program to make sure it is set for heating and cooling. also possibly gas or electric heat. and fan on during call for electric heat. these are all sellections in the installers program and usually they have one or more options for each sellection. see the installers guide for your tstat.

Nov 23, 2009 | Honeywell Electronic Programmable...

1 Answer

No Auxiliaty heat with new thermostat


The Vision Pro is a great t-stat and I have installed many of them with great results. I am wondering though if it is set up correctly. Did you go in and make sure that it is set for heat pump and for 2 stage heating? Look on the instructions how to get into the advance installer options. Go through that meanu and make sure that everything ig set correctly for your type of heating system and that it is set for 2 stage heating. From what you have here and I can tell the wiring should be okay that is why I think that it is in the t-stat programming.

Nov 15, 2009 | Honeywell Electronic Programmable...

1 Answer

I am replacing my thermostat with a Honeywell RTH221B model thermostat. The old thermostat only has 2 wires, a black one and a white one. I was told the remove the jumper between the top right receptor and...


with any two wire tstat black wire to the R terminal and the white wire to the W terminal I dont belive that you have to remove the jumper wire unless there are two transformers feeding the thermostat one for heat the 2nd for cooling which would be very unusual

the subase should have a R Y G W O/B terminals where the wires hook to the tstat

Oct 24, 2009 | Heaters

1 Answer

Honeywell T882 Chronotherm Clock Thermostat needs replacement


The two wires from the transformer are to run the clock in the old thermostat. If you connect the two other wires to any heating thermostat, it will work. Don't forget to disconnect the transformer wires. Hope this helps

Nov 10, 2008 | Honeywell Electronic Programmable...

1 Answer

Replacing a thermostat


Typically if you are replacing a heat only thermostat you will have two or three wires. On the old thermostat these wires will be attached to terminals marked "R", "W" and maybe "G". Document what color wires goes to which terminal and transpose these to the new thermostat. If you have a heat and cool thermostat, you will have two or three more wires and connected to terminals labeled "C", "B" and "Y". Again, transpose these wires to the new thermostat as best you can.

Feb 12, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

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