Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I REPLACED BATTERIES ON MODEL # TH8320U1008 THERMOSTAT, AND AM WONDERING IF I NEED TO SOMEHOW RESET SOMETHING TO GET THE A/C UNIT TO TURN ON. I GET A CLICK SOUND AS IF THE AC WILL TURN ON, BUT IT DOESN'T. HELP!

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Go to instuctions and find procedure to go to Advanced Settings. I think it is #170 to identfy the system you have if heat pump go to 190 and set to A/C Mode 0

Posted on Jul 04, 2009

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Posted on Jan 02, 2017

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Is the th8320u 1008 thermostat PROGRAMMABLE?


Yes the Honeywell TH8320U1008 touchscreen thermostat is programmable. See https://customer.honeywell.com/en-US/pages/product.aspx?cat=HonECC+Catalog&pid=TH8320u1008/U for the operator's manual. Click on the Literature tab and scroll down to the Owners Manual section. If your thermostat isn't working, make sure that it is set for heating or cooling, as needed. Then check the batteries, the wiring and the HVAC system. (The thermostat has a default set of heating/cooling periods.)

It's not uncommon for one of the wires going to the thermostat to break. Find the undamaged section of that wire and secure it under the appropriate contact spot. Make sure all of the wires are positioned at the correct contacts.

I hope this helps.

Cindy Wells

May 18, 2018 | Heating & Cooling

1 Answer

My Honeywell Themostat is no longer controlling the systems after a battery change, but otherwise looks fine. Help!


The replacement batteries could be defective or installed incorrectly. Also, if the thermostat has to be removed from its mounting base for installation of replacement batteries, it may have been reinstalled incorrectly.

Nov 07, 2015 | Honeywell Heat/Cool Thermostat

1 Answer

Is there a battery in the t8000c thermostat the screen is blank


There should be a couple of AAA batts in it. Grab all 4 corners and pull straight out & off the mounting plate. If no batteries are installed it is hard wired & the problem is at the air handler(blown blade fuse or open transformer winding). When you reinstall batteries make sure there is no corrosion. And careful when you put the tstat back onto the base. There are some small pins that need to align with its holes/terminals. Honeywell has a great 1-800 support #. Should be on the tstat.

Jun 28, 2015 | Honeywell TH8320U1008 VisionPRO 8000...

1 Answer

The functions seem to be frozen. what do I do?


Try removing power to the thermostat including the batteries for 20 seconds and see if that solves the problem.

Sep 24, 2014 | Honeywell Th8320u1008 Visionpro Digital...

2 Answers

I replaced the battery to honeywell RTH230B. Heat won't turn on.


I followed a comment from a previous source and reversed the polarity of the batteries. I then flipped them back to the correct position and the flashing battery indicator went away and the thermostat functions correctly.

Feb 04, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

My Model TH8320U1008 touchscreen not working. I have replaced the batteries, still doesn't work. Is there a way to reset it?


I dont think its your thermostat. The 8000 pro series is relatively new. I think is you furnace you lost 24 Volt power. Check the furnace out first. www.fastacservice.com

Oct 18, 2009 | Honeywell Electronic Programmable...

2 Answers

TH8320U1008VisionPro8000 honeywell thermostat with Affinity York


Take a multimeter and check your rh and w terminals. With the face off, you should get 24 volts. If you do not get 24 volts, turn the power off, and check the continuity, you should get ol (open load). Now if you do not have 24 volts, and the meter reads ol, there is a problem in the wiring to the thermostat. My only concern is the green light blinking slowly, but if that is normal on your unit, I will let it be. Hope this helps

Mar 24, 2009 | Honeywell CT3600 7 Day Electronic...

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