Question about Honeywell RTH6580WF Wi-Fi Thermostat

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I have a Honeywell RTH6580WF Wi-Fi Thermostat that has "Cool On" or "Heat On" flashing in an endless loop. Could there be a major issue?

I have a Honeywell RTH6580WF Wi-Fi Thermostat that has "Cool On" or "Heat On" flashing. I watch it run it course and then it acts like it resets the thermostat and starts over. Its in an endless loop. I replaced the Dual Run Capacitor thinking that was the issue and it ran fine for an hour and went back into the "Heat On" flashing.

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Pull the power red wire off the thermostat and batteries out if it has battery backup, then reinstall...much like a computer restart. If this doesn't work, then replace your thermostat.

Posted on Jun 27, 2016


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6ya staff

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Posted on Jan 02, 2017


Todd B

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SOURCE: my honeywell thermostat has a flashing message of (bat lo) what does this mean?

Replace the batteries...should be double A's

Posted on Dec 17, 2013

Terry Hair

  • 4134 Answers

SOURCE: How do I change the battery on Honeywell Thermostat T8001C?

According to the manual for the model series (see link), only the T8002 Model has batteries. They are accessed from the right side of the thermostat. See page 14.

Posted on Jan 10, 2015


  • 12962 Answers

SOURCE: RTH2310 thermostat backlight stopped working. Is there anyway to change the bulb or fix it?

U replace it.

Posted on Dec 03, 2015

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1 Answer

I have a different home wi fi router how do i reconnect my wi fi thermostat sing-in

Press Fan & up arrow @ the same time until you get into programming mode. download the manual & go through the numbered steps until you get to the turn wifi on & off. When you turn it on, it should show up on your computer wifi list. then program the wifi the same way you did initially with the other router.

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When I go to system, Why are only heat or off shown as options, no cool?

You might want to check if the wires are ******* in tight on the stat and make sure the wiring matches the furnace or air handler connection Example r to r. W to w,g to g,c to c ,y to y, and there should be a jumper wire between rh and rc

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1 Answer

I am unable to connect to the Internet even though the email address and password are accurate. This just happened.

Trouble Shooting - - FAQs ' FWD - Honeywell
How do I delete that thermostat from my Lyric app? If you've moved and ... How do I change the email address I use to manage my Lyric? If you already have a ...Missing: programmable ‎accurate

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Honeywell thermostat blows cold air on heat

Thermostats don't actually blow anything, the heating system might though. Check the breakers for your heat system, then call a heating specialist. They're really not that expensive.

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Honeywell how to install

Did you try E too aux and x1 to c?

Jul 20, 2014 | Honeywell RTH6580WF Wi-Fi Thermostat

1 Answer

Can't set clock

Hello Dan, I found this online and thought you may be interested in taking a look at it. Here's the website address and hope it's informational.

If this doesn't solve the problem, you might have a defective thermostat.

Mar 08, 2014 | Honeywell RTH6580WF Wi-Fi Thermostat

1 Answer

RTH6580WF how do i reset to factory default?

It is actually an extensive process to reset or reconnect with a new wifi setup. To try to explain it would probably be confusing and couldn't give you step by step. Here is the link to the installation instructions that explain it perfectly and visually,
Hope this helps!

Dec 07, 2013 | Honeywell International Wi-Fi Programmable...

1 Answer

Honeywell thermostat RTH6580WF heat is ok but a/c doesnt cool

Same problem here. Gas, hot air furnace with A/C. Fan works with heat, but not A/C. Furnace is old, and I had to move the G wire to C at the furnace, plus install a jumper from Y to G.

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