Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater - Answered Questions & Fixed issues

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.

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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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

Okay first i replaces the battier so now its reading 17.5 its not gaving me the right temperture

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

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

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

the cooling setting will not go below the heating setting. lower the heating setting so you can lower the cooling

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

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.

Do you have a heat pump? And if so is it a heat pump compatible thermostat.

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

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

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

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.

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

So the indoor fan is running and blowing air inside but it is not cold?? Is the outdoor fan running ? If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

If you have a float switch on your drain line and the drain is backing up this will cut power to the tstat. Drain slowly drains, float switch resets, power comes back to tstat. That's my educated guess. But, is there batteries in the tstat? If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Yes, be very very concerned. Get help. Don't use heater.

Sounds like the tstat, obviously, isn't responding. A sure check is to bypass the tstat. Turn power off to airhandler and remove cover. Remove red, green and yellow wires and wire nut/ twist together. Turn machine on and see what you get. If inside and outside turns on...bad tstat OR just not setup properly. EVEN THE PROFESSIONALS READ THE INSTRUCTIONS THESE DAYS!! If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79