Question about Honeywell Programmable Thermostat Heater

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Honeywell thermostat My Honeywell thermostat model #TH8320U1008 with the touch screen recently stopped working. When I touch the screen it will not respond. Although my heat will still come on but it is locked to my settings and won't let me adjust the settings. I've only had this thermostat for about two months now. Any ideas on how to fix this?

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  • 42notla Apr 04, 2008

    yesterday, i removed the unit from the wall to replace the batteries. noticing thatt he screen was smudged, i sprayed some windex on it and immediately used a paper towel to remove it. the thermostat is now locked on the former functions and can no longer be re-programmed with its old flexibility. I have tried placing it in the sun for one-half hour, replacing the batteries and calling honeywell who reports that this is not a product defect, but user problem.

  • Anonymous Dec 28, 2008

    Honeywell thermostat T-87. Unit Cycles too often and temperature is 7 degrees in difference from actual temp. and what is requested. please help

  • docarnie2 Jan 19, 2009

    Our thermostat is also new and just stopped responding to touch only on the temperature settings and the done key. I have tried the 0670 code with no results. what else is there to do?

  • Diane F Seimetz Feb 07, 2009

    I have the TH8500 and have the same problem - I can make some changes to the touchscreen but the "done" button won't work

  • Bill McEachen
    Bill McEachen Dec 27, 2014

    this worked like a charm, I very much appreciate it (Blacksburg VA)

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9 Answers

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Thermostats can be found at amazon, take a look here: Defy Mother Nature with our Best Buy. I hope this was helpful. cheers

Posted on Dec 15, 2014

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This is a long post, but I suggest you read the whole thing before doing anything.
1. Remove the face of the unit from the wall, then remove the plastic casing that covers the touch screen. It takes some force to remove it, and it will snap as you pull it off (sounds like it's breaking but it is not). Then remove the circuit board (with lcd attached) by moving the tabs on the left and right outwards at the same time (you can see where the tabs are securing the screen in the casing).
2. Near the top there are too small ribbon cables that plug into the circuit board. They are fragile, so be careful with them. On the board, you can see the connectors marked for touch screen and lcd. One for each cable. There are two small tabs on either side of the cable. Pull up slightly on the tabs at the same time and they will slide up only 1/8 of an inch or less (very small amount).
3. Carefully slide the cable out (upwards, if you were looking at the touch screen) and then slide it back in to ensure it is fully seated. Again, be careful with these cables, as they are fragile. If your touch screen does not work, then you should only have to reseat the touch screen cable. Reseat the lcd only if there is a problem with the visual display.
4. Insert the lcd screen back into the casing by pushing it straight in (there is a small hole in the lower left corner that matches with the casing). Reattach the plastic cover by snapping it back on (should go back on with some force if you line it up correctly). Finally, reattach the entire face of the unit to the wall (make sure you line this up as well, the pins have to be inserted correctly to avoid breaking them).
If everything works now, then you are back in business. If not, you probably broke your touch screen.

Posted on Dec 11, 2010

  • 23 more comments 
  • Andrew Fullford May 07, 2012

    Just fixed my thermostat using turtledriver's method (thank you!) On my unit, the LCD cable had gold contacts but the touch screen cable had silvered contacts which are susceptible to oxidation, causing exactly this kind of problem. Honeywell, why the difference?

  • Sean May 30, 2012

    I have to say I was skeptical, but this worked and only took me 5 minutes to do. Great post!

  • imahopen1
    imahopen1 Aug 15, 2012

    This was really intimidating only cause I was worried I would break it. But just follow Turtledriver and slow and steady wins the race! I did it in about 8 min. and it worked like a charm!

  • Kodachrome Sep 06, 2012

    It worked for me too. Did the ribbon cables get inserted incorrectly at the factory or does the connector work loose after some time? To open the case, grab a hold of those tabs near the battery holder.

  • rosadawson
    rosadawson Feb 22, 2013

    This worked for me as well. Thanks for the tip!!

  • J. Cook Mar 03, 2013

    Thank you so much! You saved me $130.

  • Cathy Reed
    Cathy Reed Oct 20, 2013

    I was going to try removing the cable to the touch screen but it looked so fragile. I decided to try changing the lithium battery, and the problem was solved.

  • insert_feet Nov 03, 2013

    What type/voltage of lithium battery did you replace? I tried removing the cables and it didn't work. The middle of the touch screen is still unresponsive.

  • campbell
    campbell Dec 13, 2013

    This advice worked!!! My touch screen came back on ! YOu saved me $HUNDREDS! Thank you!

  • David Stav
    David Stav Jan 05, 2014

    worked for me too!! thanks!!!

  • Dan Grimes
    Dan Grimes Feb 10, 2014

    My screen worked but only for a minute to change the date. Now the "done" button doesnt do anything to get back to main settings? Any advice?

  • Dan Grimes
    Dan Grimes Feb 10, 2014

    My screen worked but only for a minute to change the date. Now the "done" button doesnt do anything to get back to main settings? Any advice?

  • Dan Grimes
    Dan Grimes Feb 10, 2014

    My screen worked but only for a minute to change the date. Now the "done" button doesnt do anything to get back to main settings? Any advice?

  • Dan Grimes
    Dan Grimes Feb 10, 2014

    My screen worked but only for a minute to change the date. Now the "done" button doesnt do anything to get back to main settings? Any advice?

  • Michael Stanley B
    Michael Stanley B Feb 16, 2014

    Using the above post, I removed the ribbon cables but also wiped them with alcohol prior to re-seating them. My LCD display works like a charm again. I also took the opportunity to replace the lithium battery.

  • Jennifer Cheng
    Jennifer Cheng Mar 30, 2014

    Dan I have the same problem as you - I can change the date but the "Done" button doesn't work... did you ever find a fix?

  • Ted Zeck Jul 06, 2014

    I have the VisionPRO TH8000 Series. You'll need one of those "star" screwdrivers or sockets to remove two screws. I unplugged both ribbon cables, gave it a minute and reattached. Even with the backup batteries falling out, my settings were saved and, "VOILA!" Thanks for the great post!

  • Abisola Dasofunjo
    Abisola Dasofunjo Aug 09, 2014

    I can't Find the tabs to lift to remove the ribbon cables

  • Deb Falcon
    Deb Falcon Oct 12, 2014

    No, did that, didn't help

  • Bill McEachen
    Bill McEachen Dec 27, 2014

    this worked great, thanks !! Blacksburg Virginia

  • Anonymous Oct 19, 2015

    Thank you so much for your response. Worked perfectly.

  • bob3635 Oct 29, 2015

    sadly did not work for me. reseated both cables, touchscreen still not responsive. too bad, will have to replace.

  • Cynthia Mtivier
    Cynthia Mtivier Jul 21, 2016

    Thank you so much. Your easy steps worked like a charm. Very grateful!!

  • Mike Colonna
    Mike Colonna Jul 28, 2016

    I know this was originally posted a while back and hopefully this thread is still being monitored. I have a similar Honeywell IAQ thermostat but the problem I am having is that the buttons on the left side of the screen (HOLD, SCREEN, SYSTEM and FAN) only work occasionally. This can really put a crimp in changing, for instance, permanently changing the schedule. Is there any way just to replace the touch screen or does anyone sell just a replacement touch screen for these thermostats?

  • William Johnson
    William Johnson Aug 16, 2016

    My specific problem on the Honeywell TH8321U1006 was (1) the humidity gauge was faulty -- reading 87% rather than 66%, thus the A/C was going on way too much, and (2) the touchscreen was not working on the right side (only), so it was impossible to adjust the temperature, even though the system was working. The advice from Turtledriver not only fixed problem #2, but also (why?) problem #1. And it's really not hard to follow his/her directions. THANKS.

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The manual should tell you how to unlock it. You may have to reset and re-program it.

Posted on Feb 12, 2008

  • Deb Falcon
    Deb Falcon Oct 12, 2014

    All these things tell you how to unlock the thermostat, but the first instruction if push system button, well, we do and it does nothing, so we can't proceed

  • Deb Falcon
    Deb Falcon Oct 12, 2014

    "is" not "if"

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We have a thermostat that has 2 settings for the fan ( 1 ) is "ON" and ( 1 ) is auto which setting do we pout the fan on in the winter

Posted on Dec 16, 2008

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The fix that TurtleDriver suggested fixed mine. I had to reseat the ribbon cable for the touch screen. The first couple of times it didn't fix it, but then I thought maybe the ribbon is worn where it is making contact, so I inserted it fully then pulled it back a touch to make it clamp on a new part of the ribbon and all is good now. First problem i have had with these and I have had two for several years. Thanks TD for the tip.

Posted on Dec 29, 2015

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TURTLEDRIVER
You are awesome.
Worked like a charm!

Posted on Jan 17, 2013

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I had the same problem. I tried the same solution - removing and then putting back the wires. Works fine now. Makes one think about buying another Honeywell if they have such a well-known defect. I bet it's made in China.

Posted on Jun 23, 2012

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Your screen is locked it happens with that particular tstat for some reason but you can try to take the batteries out and let it sit for a few but most likely you will have to get another one i am an hvac service technician and have seen it alot in fact it happen to m ine thats why i dont use it anymore sorry for the problem

Posted on Jan 19, 2012

  • Cathy Reed
    Cathy Reed Oct 20, 2013

    Replace the battery.

  • insert_feet Nov 03, 2013

    Cathy, what kind/voltage of battery did you purchase to use?

×

Hold down the system button on the left side of the screen for a few seconds then after the screen changes hold the two buttons to the left and right of the center button on the bottom of the screen then use the left arrows to get to 670 and the right arrows to get to 0 that is how I unlock mine? Good luck!

Posted on Oct 20, 2008

5 Suggested Answers

heatman101
  • 43501 Answers

SOURCE: TH8320U1008 Honeywell touch screen thermostat temp

Hi,

Whoa, that stinks..... I think that is the first problem I have seen with those t-stats... they are very dependable....

I would take out the batteries and let it die for about a day....I think it takes that long for the capacitors to fully discharge... Don't know what you will do for heat while your doing that, unless you know how to jumper the furnace... R-W on the circuit board will get you heat....
Then reinstall the batteries and the t-stat and see if it comes back....

Oh and make sure you also leave it off of the wall so it don't get power from the furnace either... you want it to completely die... then you will have to reprogram it... so I hope you still have the manual...

heatman101

Posted on Nov 26, 2010

  • 571 Answers

SOURCE: round honeywell thermostat

Sounds like you have a T86 thermostat...take the round front cover off to view the Mercury switch. Watch the bulb when you change the temperature to a higher setpoint. If the bulb makes contact when rotating it up, and the furnace doesn't go into a call for heat, then it could be the thermostat, wiring, or furnace problem.

Posted on Dec 15, 2013

mikadot
  • 2113 Answers

SOURCE: i have a honeywell thermostat t6360.the light

Many thermostats have battery backup as well as the 24 volt ac. Have you replaced the batteries to see if it fixes all of your issues at once?

Posted on Nov 02, 2013

dorothyslaug
  • 5 Answers

SOURCE: The middle of the touchscreen of my Honeywell

it not a touch screen, its manual old style honeywell, square box, not round, not rectanglur.

Posted on Nov 03, 2013

Testimonial: "It is a touchscreen. I have seen references to the battery being round and lithium CR2450; however, not sure if this is accurate. Does anyone know?"

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Whoa, that stinks..... I think that is the first problem I have seen with those t-stats... they are very dependable....

I would take out the batteries and let it die for about a day....I think it takes that long for the capacitors to fully discharge... Don't know what you will do for heat while your doing that, unless you know how to jumper the furnace... R-W on the circuit board will get you heat....
Then reinstall the batteries and the t-stat and see if it comes back....

Oh and make sure you also leave it off of the wall so it don't get power from the furnace either... you want it to completely die... then you will have to reprogram it... so I hope you still have the manual...

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