Question about Honeywell Programmable Thermostat Heater

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Thermostat won't work in cooling mode or fan ON mode

I installed a new Honewell RTH230B programmable thermostat last fall, and it worked through the winter fine. Now that I need cooling I can't get it to start the A/C. The fan will not run in the ON position, either.

I checked my wires against the board in the furnace (Rh to R, Rc to C, Y to Y, W to W, G to G), and re-connected all terminals. Display shows cooling icon, but no action from unit.

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  • kramerbruce Jun 22, 2009

    Problem turned out to be a blown fuse in the furnace. No $ saved.

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The fuse blew fior a reason, this would be the thermal limiter fuse correct, make sure the condensor fan is not running slow, also make sure the condensor coils are clean. or the fuse will blow again.

Posted on Jun 23, 2009

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If the air conditioning is in use, a snowflake will appear, it seems like you are having trouble programming the thermostat or your aircon is shot

The customer care department can be accessed by calling 800-468-1502

also try their dedicated website for more information
www.Honeywell.com/yourhome

Posted on Jun 22, 2009

  • Brett McGuigan
    Brett McGuigan Jun 22, 2009



    It is a possibility that it hasn't been programmed for Cooling

    or it hasn't been wired for cooling to your air con only to your furnace for heating



    Try calling Honeywell Customer Care at 1-800-468-1502 ok

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1 Answer

New instruction manual for RTH230B


Do you mean the Honeywell RTH230B programmable thermostat? Most of the Honeywell thermostat manuals are available here: http://yourhome.honeywell.com/en/faqs/thermostat . Scroll through the pages to find the RTH230B or use the search feature. The search engine found the installation and user guide in three different languages, see https://yourhome.honeywell.com/en/supportsearch#q=Rth230b . The direct link to the manual in English is https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1800.pdf .

I hope this helps.

Cindy Wells

Dec 07, 2017 | Heating & Cooling

1 Answer

Furnace won't come on


10-17-12
Change battery on thermostat.
Usually located back of thermostat.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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R = power (or common)
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Assuming that you have a normal electric or gas furnace and air conditioning, if the heat really is coming on, then just switch the position of the the Yellow and White wires.

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Sounds like you have it wired wrong..   Pop the top off and give me to color of the wires and tell me which letter each color wire is on.. that will tell us right away if you have it wired wrong

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