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

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I have a Q674L thermostat that I am replacing with a honeywell rth6350 thermostat and the wires dont match up. Can someone help.

The Q674L has the following wires w-white, b-black, g-green,r-red, x-blue, y-yellow and o-orange. The wiring diagram for the honeywell rth6350 is: L, AUX/E, G, O/B, Y, R AND RC. I already spoke to honeywell and it didn't work so any help would be appreciated.

Posted by Anonymous on

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Posted on Jan 02, 2017

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  • 96 Answers

SOURCE: Upgrading Thermostat

Looks like your system is a heatpump system and that t-stat will not run a heatpump , you need a t-stat for 2heat and 1 cool systems

Posted on Feb 01, 2009

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  • 340 Answers

SOURCE: Replacing Old York TS to HoneyWell RTH230B

rh is hot for heating rc is hot for cooling looks to me like ya need a heat pump stat some thing to control the reversing valve.Tom

Posted on Jun 18, 2009

billyvangogh
  • 108 Answers

SOURCE: Installing thermostat - extra wire?

you have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat
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Posted on Nov 01, 2009

  • 587 Answers

SOURCE: Need wiring diagram for Honeywell RCT8100

The old thermostat has a second stage heat which is W2. The new one doesn't have second stage heat.
The wiring your describing on the old thermostat is telling me you have a heat pump with second stage heat and the new thermostat is for air conditioning only. You will need to get a thermostat for a heat pump.

Posted on Apr 02, 2010

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SOURCE: Honeywell RTH230B cooling problems...

I printed out the instructions for your thermostat. It looks like you should have the following.

There should be jumper wire between Rh & Rc

Red wire to Rh or Rc whichever is easier since there is a jumper. This is the hot wire and all the thermostat does is connect to route it to the components needed for heating or cooling.

Blue wire, tape it up and don't use it. There is no spot on this thermostat for it. It is only used on thermostats that are powered by the transformer.

White wire to W. Powers the heat relay

Yellow wire to Y. Powers the cooling contactor

Green wire to G. Powers the indoor fan relay

There is a black jumper on the back of the face plate. Look at section 2.4 Setting J2 Jumper in the installation instructions. Make sure you have it in the right position for what you have. If you don't have them just google them.

Hope this helps.

Posted on May 24, 2010

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1 Answer

I want to replace a Honeywell Q674L with a Honeywell RTH6580WF for my heat pump. Which wire is the common or C wire?


The old mercury Q674's didn't require a common terminal, so if there's not an extra wire in the bundle you'll have to fish one up... Inside the old Trane, there should be either a terminal strip with the appropriate terminal designations or possibly a bundle of color coded wires. If they are wires, originally they may have had individual tags on them, but if there are none, you're going to have to refer to the wiring diagram for the correct color for transformer common. Or... find the secondary of the transformer to determine the correct one, then extend it up to the new digital stat.

Apr 17, 2015 | Heating & Cooling

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Installed a rth6350 now no power


The RTH6350 is a battery-powered thermostat. Did you correctly install the AA batteries? Press down and pull the battery holder away from the thermostat on the right hand side. Try new batteries. Did you remember to secure the C wire with a wire nut and push it back into the wall. It should not be connected to the thermostat.

If you connected the C wire, you may have damaged the thermostat by providing too much current. Honeywell has the documentation for the RTH6350 on the product page: http://yourhome.honeywell.com/home/Products/Thermostats/5-2-Day-Programmable/RTH6350D.htm . The installation guide is here: https://customer.honeywell.com/request.cfm?form=69-2416ES . See page 23 and subsequent pages for the wiring diagrams.

I hope this helps.

Cindy Wells

Oct 11, 2014 | Honeywell RTH6350 5-2 Programmable...

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Wiring with new Honeywell thermostat


You need to put battery in the new thermostat if you gonna leave the C terminal disconnected

Jun 21, 2017 | Heating & Cooling

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Just purchased and installed a Honeywell programmable thermostat (RTH6350) and for some reason, the furnace just decided to turn on, and it won't turn off - even when i turned the thermostat off!!!...


I would recheck your wiring..... Shut the furnace off at the breaker or SSU.... Then get a pen and pad and write down the color of wires and where it is connect on the Terminal strip at the furnace..

Example: Red wire hooked to R terminal etc They should all match up with the subase of the new Thermostat.
Then go up to the thermostat and Check and make sure the colors match what you have wired at the furnace. R= Power W=Heat G=Fan Y=Cooling C=Common

There are two possible ways the heat could be power on all the time..... You have the white wire or W wire wired to G and the thermostat is set to Fan ON... or the insulation on the R wire and W wire is split and touching each other or they got pinched and are touching together which will make the furnace come on with out the thermostat controlling it..... Good Luck, Its is where I would start first.... there our other possibilitys the control board may of gone hay wire.....

May 22, 2011 | Honeywell Programmable Thermostat Heater

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Honeywell RTH6350/RTH6450 Thermostats - Have two that had to be replaced as heat would not work at all. Had Honeywell tech on for 1/2 hour he could do nothing from India!! Wondering if these were...


The problem with the honeywell brand is that the only dependable units begin with TH not RTH the RTH is for residential and you can purchase those at a local home improvement store. Go on Ebay and spend the money for a quality t-stat. "you get what you pay for"

Apr 27, 2011 | Honeywell Electronic Programmable...

1 Answer

I just installed new thermostat model RTH6350, the problem I am having is the heater does not shut off once the desired temp is reached. Any suggestions?


if you turn the t stat to the off does it still run? look for a shorted wire. remove the t stat and check the wires for a short.does it work just hanging from the wall?

Feb 04, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Need coleman thermostat schematic: LR1620 ;T874R1368 Base Q674L


http://www.iaqwholesale.com/manuals/IAQmanuals/Honeywell/Thermostats/NonProgrammable/ManualNonProgrammable/T874/60-2485.pdf

Dec 02, 2010 | Coleman Heating & Cooling

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