Question about Honeywell Programmable Thermostat Heater

1 Answer

Problem with Honeywell RTH230B Thermostat

The wiring was originally set up that way Yellow - Y, White - W, Green - G, with Red to Rc, and Black to Rh. Those are the only options I have with the Honeywell RTH230B (only 5 spots). Could the Yellow or White or Green wires be wired incorrectly and they should be going to the Rc or Rh spots? If so how would I be able to tell?

Posted by on

  • pstamm May 31, 2008

    Originally when I purchased the tstat there was a jumper wire between the Rc & Rh spots. However in the instructions it mentions that for a 5 wire system, the jumper is not needed. It was working fine for heat with all 5 wires connected, however now neither the heat or cool are working.

    The system is a York Heat and A/C unit.

    I've since found the old jumper and replaced it, using the Red wire then the Black wire in the Rh position still with no luck.

  • Buck Whyte
    Buck Whyte May 11, 2010

    RC and RH are for the fan control so usually it is jumpered togehter.  RC-cooling RH-heating..I find that strange unless you have seperate fans for heating and cooling.. tell me what kind of system you have... heater and ac


1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have my temp on C and I need to change back to F I have the RTH230B programable

Posted on Jun 07, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Hi, I just bought a Honeywell RTH8580WF1007 and tried to install it, I placed the wires in on the same letters as they were with my old thermostat. However, now that the new thermostat is wired up, it wont...

739dfb58-7a38-4a51-a7ed-ab942a7253a0.pngRH is red heat and RC is red cool, red being the "hot leg" of the 24 volt control voltage, normally you will have a jumper from RH to RC, the fact there is an RC tells me there must be an RH too?
I will look after this post and come back if any new info was found, other wise I will say call 1800 Honeywell and provide you a diagram to check out.

Aug 25, 2013 | Honeywell RTH8580WF1007 7Day Touch...

1 Answer

I installed a Honeywell RTH230B model thermostat. The heat works fine, but the AC is blowing warm air. Wires from old system are as follows: Y=yellow; G=green; R=red; O=brown; C=blue; E=white (it looked...

the colors of old system are for heat pump.if you have a heat pump you need heat pump thurmostat and colrs will make more sense.if not,then you need to go into furnace to see what colors go where.yellow is cool, goes to compressor contactor,usually another wire going from furnace to outside is fan relay rh is heat call rc is cool call

Jan 01, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Replacing thermostat what to do with single red wirew/bridge?

yes u leave the bridge intact and just put ur red wire to r or rc and usually they say rh and rc that is for a 2 transformer system which obviously u dont have so leave the wire intact jumped and hook ur red wire up yellow is ur ac wire white is ur heat wire and green is ur fan wire and red is ur 24 volt hot wire all a tstat does is jump that red wire to white for heat green for fan or yellow for ac but make sure ur power to ur unit is off before u change wires or u risk touching wires together and burning up transformer

Feb 24, 2010 | Honeywell Programmable Thermostat Heater

2 Answers

York Furnace and Honeywell Thermostat Problems...

run the red wire to rc and run a jumper between rc and rh tape off the brown

Feb 10, 2010 | Honeywell Programmable Thermostat Heater

1 Answer


red goes to RC and RH, White goes to W, Green goes to G and Blue goes to Y. iam assuming on the old tstat that Red whent to R White went to W Green went to G and Blue went to Y

Sep 20, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

Heating and Cooling Thermostat - can't get the wires right

Depending on if you have gas or oil heat the connections would be slightly different, but if you were only using the red, white, and black before, this should work. Red to Rc with jumper to Rh (or vise versa..) White to white, and Black to your Y terminal. Your Rc and Rh terminals are your 24 v supply, Yellow is connected to your outdoor unit, and W is the common for the heat, and G is for you high speed fan. Hope this helps

Jul 06, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell RTH230B

Jumper RH to RC and Y to W (Just like the old thermostat) and hook the cable wires as you have indicated with the exception of the blue wire - clip it back - it is not needed. This is a heat pump system so heating and cooling are done by the same unit. RH stands for Red Heat, RC for Red Cool, the W and Y are the neutral sides to the heat and cool control circuit. That should get you going good enough to start learning the intricacies of programming the box.

Jun 02, 2008 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell RTH230B

Normally, you should have 5 color wires: W-White, Y-Yellow, G-Green, R-Red and C-Blue.

The Blue wire is a common from the transformer on older systems, which is probably hooked to RC terminal.

Try this: Remove the blue wire and jump the RC to RH with the red wire and you will be fine. Blue wire should not be needed with the new thermostat.

This should also be stated in the instruction manual.
Hope this helps.

Feb 03, 2008 | Honeywell Programmable Thermostat Heater

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

647 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers


Level 3 Expert

2046 Answers

Brandon Berry
Brandon Berry

Level 2 Expert

407 Answers

Are you a Honeywell Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides