Question about Honeywell Programmable Thermostat Heater
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
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
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?
I have to say I was skeptical, but this worked and only took me 5 minutes to do. Great post!
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!
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.
This worked for me as well. Thanks for the tip!!
Thank you so much! You saved me $130.
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.
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.
This advice worked!!! My touch screen came back on ! YOu saved me $HUNDREDS! Thank you!
worked for me too!! thanks!!!
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?
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?
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?
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?
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.
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?
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!
I can't Find the tabs to lift to remove the ribbon cables
No, did that, didn't help
this worked great, thanks !! Blacksburg Virginia
Thank you so much for your response. Worked perfectly.
sadly did not work for me. reseated both cables, touchscreen still not responsive. too bad, will have to replace.
Thank you so much. Your easy steps worked like a charm. Very grateful!!
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?
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.
Excellent. Worked. Thanks. The ribbon won't come out of the little white plug on the circuit board unless you unlock the plug by sliding the two tiny locks on either side of each plug. The locks slide slide parallel to the board. One ribbon was still stubborn so I used my electronic screwdriver by sliding inside of the loop and pulling. I'm guessing doing this discharges curent to the screen. I wonder if removing the backup disc battery wouldn't work, but you would have to re enter time Daye and schedule if so. Thanks again!
Thank you, now it works again
Thank you! This worked!!!
This worked for me!!!
Worked for me too. Thank you very much
So hoping this great suggestion would work, but it did not. My screen is not blank... I have 5 empty boxes across the bottom. Any other thoughts out there?
Many thx, it's working. Back to normal
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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
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
"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
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
TURTLEDRIVER
You are awesome.
Worked like a charm!
Posted on Jan 17, 2013
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
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
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
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
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
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
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?"
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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.
Honeywell thermostat T-87. Unit Cycles too often and temperature is 7 degrees in difference from actual temp. and what is requested. please help
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?
I have the TH8500 and have the same problem - I can make some changes to the touchscreen but the "done" button won't work
this worked like a charm, I very much appreciate it (Blacksburg VA)
It worked for me too. Thank you very much
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