20 Most Recent Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater Questions & Answers


I need to reset the date and year


I had exact same problem with RTH7500. Did not set the date properly at the beginning and than realized that there is no menu option to change the date after it is saved once (???!). I was very confused for few hours and wandering - trying to find changing option on thermostat menu; than I was looking online what can be done... I could not find solution...

Than I took out both AA batteries, open the thermostat (be very careful while doing this - you don't want to break plastic peaces that hold the thing together) and took out the button battery thinking that this will reset the thermostat... but it did not.

I repeated the same thing, but this time, while the button battery was out, I put two AA batteries back and this reset the thermostat... the old - blinking date appeared and I was very happy to see this on thermostat screen! This time I set the time properly and it works fine.


Hope this will be helpful if you did not solve the issue yet... if you did, someone else might find this solution useful.
11/6/2022 2:03:55 AM • Honeywell... • Answered on Nov 06, 2022

How do I lock keys on TB7220U? The previous

Access the ISU (installer setup) menu by pressing the system key from the main screen then press and hold the two keys on either side of the center for approximately five seconds. Hit next until you find 0670 and then change the value to 4. http://www.forwardthinking.honeywell.com/related_links/thermostats/commercial_pro/install/62_0221.pdf On a side note, this information was insanely hard to find.
5/26/2022 8:45:21 AM • Honeywell... • Answered on May 26, 2022

I have APRO1 IAQ T701 Non-Programmable Electronic Thermostat. The heater part doesn't work. it reads 44 degrees, but I can't adjust it. Is there anyway to fix it?

Question edited for clarity 'make model (what it is)' Question moved from Refrigerators to a Thermostat Category. Try replacing the Internal Battery (2 x AA). You can also try a reset.

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12/21/2021 7:01:30 PM • Honeywell... • Answered on Dec 21, 2021

Honeywell UtilityPRO thermostat backlight won't go off

After posting that I was having the same problem, I found a solution.
I used these instructions http://www.hydro-temp.com/help/drawings/honeywell%2069-1894ES.pdf and followed the Installer Setup on pages 6 through 10. Basically you just need to enter the setup mode following the instructions, scroll to setting# 280 and change the setting from "1" to "0" then the backlight will turn off after 8 seconds. Don't change any other settings if you don't know what you are doing.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/jeffrey_634abadf963e31e5
7/23/2021 1:52:09 PM • Honeywell... • Answered on Jul 23, 2021

What wires go to what

The colors you have are not standard.
Your going to have to see where the wires connect on your appliance to answer this. find out and post back
2/11/2021 11:41:35 PM • Honeywell... • Answered on Feb 11, 2021

Honeywell thermostat not showing temperature

Okay first i replaces the battier so now its reading 17.5 its not gaving me the right temperture
11/6/2019 1:38:31 AM • Honeywell... • Answered on Nov 06, 2019

Honeywell thermostat t8400c intermittent blank screen

It actually sounds like the batteries are going dead if the 24v from the furnace are not providing the power to the thermostat.
1/25/2019 11:16:38 PM • Honeywell... • Answered on Jan 25, 2019

I have a programable honeywell

If you want clean air without changing the temperature and without using as much power as on the A/C setting then put it on "Circulation" which just means you'll just filter dust etc out of the air. If you want to change the room temperature put it on Auto at your desired temp this will filter the air longer as it's running more but it will use more power than Circulation there's only a better setting if you tell me your exact requirement eg do you want to cool the room or just clean the air, or clean the air saving power??? otherwise if you don't care about the power cost then the "On" setting is the best as it filters non-stop and cools the air non-stop. Cheers
1/2/2019 7:26:45 PM • Honeywell... • Answered on Jan 02, 2019

I have a blinking snowflake icon on my air

When the snowflake is blinking the thermostat in in a delay mode designed to protect your compressor. If it does not stop blinking in 15min the stat is bad otherwise something is wrong with the AC
12/21/2018 2:24:09 AM • Honeywell... • Answered on Dec 21, 2018

How can I bypass the Honeywell 6000 programmable thermostat?

Page 13 of instruction manual
8/28/2018 8:22:53 PM • Honeywell... • Answered on Aug 28, 2018

I just bought a honeywell RTH2510/RTH2410. It

Your system has 2 stages of heat. Therefore you should have a 2 stage tstat. The 2510 is 1heat/1cool, put your w2 wire in with your w1 wire, you will be fine. If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79
5/10/2018 10:25:58 PM • Honeywell... • Answered on May 10, 2018

Cooling limit on th320u

the cooling setting will not go below the heating setting. lower the heating setting so you can lower the cooling
1/16/2018 6:55:57 AM • Honeywell... • Answered on Jan 16, 2018

Trane xv95 converted to propane is on system lockout

worth checking over heat temp sensors (klixon ) sensors can cause heater to go into a cool down purge Through an open circuit heat exchanger (Klixon ) temp sensor Ive seen before good luck
11/26/2017 6:40:33 AM • Honeywell... • Answered on Nov 26, 2017

Ultrastat Thermostat

70 to 72 degrees maximum surely now we are all supposed to be pulling together to save our planet??? I suggest you download the instructions for your type of thermostat. If the thermostat doesn't work per instructions it is obviously faulty. You could contact Honeywell for advice over such an important matter.
11/17/2017 10:21:04 AM • Honeywell... • Answered on Nov 17, 2017

I have a Honeywell TH5220D

Do you have a heat pump? And if so is it a heat pump compatible thermostat.
11/15/2017 8:15:35 PM • Honeywell... • Answered on Nov 15, 2017

Change from old lennox thermostat to honeywell 5000

no offense but you need some new a.c. guys. what if they were hired to do this job, would they say they couldn't do it? we need model numbers of tstat and indoor unit to help, obviously these colors go to the same components your new tstat will control! If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79
10/29/2017 12:08:07 PM • Honeywell... • Answered on Oct 29, 2017

Honeywell tstat not working in auto cool mode

so with system setting cool/ fan setting auto, the condenser runs but the indoor blower does Not? but when system setting cool /fan setting on, the condenser runs and the blower runs? If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79
10/25/2017 10:40:12 PM • Honeywell... • Answered on Oct 25, 2017

Honeywell zoning system

No. If it's power open and power close you need 3 wires at both locations. If it has a spring you could get away with 2 wires. Depending on how hard it would be to run a new wire you do have the option of changing the damper. If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79
9/19/2017 10:01:17 AM • Honeywell... • Answered on Sep 19, 2017

Gas heater short cycles

At your indoor unit, look at 1 of the front panels and see if there is a clear, plastic view port. Look through it and try to see a red flashing led. Count the flashes and look at the factory data on the front of the unit. That should give us a trouble code and lead us in the right direction. Also make sure air filters are clean.
8/25/2017 12:54:43 PM • Honeywell... • Answered on Aug 25, 2017

New battries in Duracraft Programmable Thermostat for A/C...still won

Remove the thermostat and just touch the wires together and make it run until heat wave is over then figure it out. Kinda of a pain but at least it be cool
8/7/2017 11:20:20 AM • Honeywell... • Answered on Aug 07, 2017
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