Honeywell TH9421 Support Question
Honeywell TH9421 Support Question
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Question posted by iamjam66 on December 25th, 2017
Touchscreen
The right side (temp control side) of the touchscreen is not responding. Opposite side responds as it should. Any fixes before I purchase a new one?
Current Answers
Answer #1: Posted by anis0012 on December 26th, 2017 2:00 AM
anis0012
Member since:
December 17th, 2017 Points: 196,100
Member since:
December 17th, 2017 Points: 196,100
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.
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.
Related Honeywell TH9421 Manual Pages
Owner's Manual - Page 2
...All rights reserved. Copyright © 2009 Honeywell International Inc.
Never use sharp instruments, such as a pencil or pen, to the thermostat,... always press keys with this product please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502
Read and save these instructions.
® U.S.
BE CAREFUL! To prevent damage to press touchscreen...
Owner's Manual - Page 3
... is ready to go . CAUTION: EQUIPMENT DAMAGE HAZARD. Table of contents
VisionPRO® IAQ
About your new thermostat Programming at a glance 2 Quick reference to controls 3 Quick reference to status display......... 4
Programming & Operation Clock setting 5 Fan setting 6 System setting 7 Energy Star settings 8 Using program schedules 9 Program schedule overrides 10 Vacation hold...
Owner's Manual - Page 4
Set clock...See page 5 2. Set humification, dehumidification & ventilation controls, if applicable See pages 17-19
ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and manually adjust... system setting: Preset to Auto See page 6 3. Operating Manual
About your new thermostat
Your new thermostat is pre-programmed and ready to go to bed at 10 pm See pages 8-11 5.
Owner's Manual - Page 5
Quick reference to controls
Press day(s) to set program schedule (see page 9)
Press to select fan operation (see page 6)
Press to select system type (see page 7)
Press to set ...
Owner's Manual - Page 9
... SYSTEM
VisionPRO® IAQ
Press the SYSTEM button to select, then press DONE:
• Heat: Thermostat controls only the heating system.
• Cool: Thermostat controls only the cooling system.
• Off: Heating and cooling systems are off. • Auto: Thermostat automatically selects
heating or cooling depending on the indoor temperature. • Em Heat (only for...
Owner's Manual - Page 10
... cancel period]
62 °
Cool (Sat-Sun)
78 ° 85 °
[Or cancel period]
78 °
[Or cancel period]
82 °
69-1815EFS-06
8 This thermostat is pre-set to use EnergyStar® program settings. We recommend these settings, since they can program four time periods each day, with different settings...
Owner's Manual - Page 12
...
Heat On
78 COOL
SCHED HOLD CLOCK SCREEN MORE CANCEL
Press to set timer
Press s or t to resume program schedule
69-1815EFS-06
10
The new temperature will resume and set . When the timer expires, the program schedule will be maintained only until the time you set the temperature to the...
Owner's Manual - Page 15
... the alert timer. After replacement, press RESET to prevent equipment damage.
This will control temperature and humidity to activate this feature does not work, contact your installer.)
13
69-1815EFS-06 Flashing message: Reminder to Auto, the thermostat automatically selects heating or cooling depending on screen. Adaptive Intelligent Recovery: This feature allows...
Owner's Manual - Page 17
... 30 seconds, press DONE to resume normal operation, or press SCREEN again if you can clean the screen without changing any liquid directly on the thermostat. Use water or household glass cleaner.
Spray liquids onto a cloth, then use the damp cloth to clean the screen. SCHED HOLD CLOCK SCREEN MORE
15...
Owner's Manual - Page 18
... current outdoor temperature is installed, the display shows the indoor temperature at the location of temperature readings from all sensors or an average between the thermostat and the sensor(s).
69-1815EFS-06
16
Owner's Manual - Page 19
... level
32 Inside
DONE
Press to save and exit, or press CANCEL to set the humidity and Frost Control level. Once frost no longer appears, the thermostat will not be displayed.
17
69-1815EFS-06 When using Frost Protection, if frost/condensation appears on windows, lower the frost setting. Note: If you...
Owner's Manual - Page 20
... air conditioner to reduce humidity (may cool as much as needed to reduce humidity. If installed to control a dehumidifier, the thermostat can activate it as 3°F lower than your temperature setting).
Operating Manual
Dehumidification control
Press to select Auto or Off
Press to set desired humidity
73 Inside
AUTO
DEHUMIDIFIER
55
DONE
Press...
Owner's Manual - Page 21
... to save & exit
VisionPRO® IAQ
You can still be requested by the installer, the thermostat will turn off /on the automatic ventilation only. Auto/Off will ventilate your home at any ...until the ventilation screen is displayed, then press s or t to set the ventilation timer. Ventilation control
Press to set ventilation timer
AUTO
DONE
40 VENT
Minutes
CANCEL
Press to save and exit, or...
Owner's Manual - Page 24
... default Energy Star settings
Backlight
Function 0280
Options:
Press s/t to turn the program schedule on low intensity, full bright after keypress
69-1815EFS-06
22 Thermostat is non-programmable. 4 Program schedule is lighted:
0 Light on for approx. 45 seconds after keypress 1 Light always on or off:
Options: 0 Program schedule is off...
Owner's Manual - Page 25
...1 On: Auto-change to daylight savings time (through 2006, and for areas that do
not use the new 2007 DST calendar) 2 On: Auto-change to daylight savings time. Advanced functions
VisionPRO® IAQ
Temperature ...Fahrenheit 1 Celsius
Daylight savings time on/off
Function 0330
The thermostat is pre-programmed to automatically adjust to daylight savings time (2007 and beyond, for areas that use...
Owner's Manual - Page 28
...:30")
Screen lock
Function 0670
Press s/t to choose a screen lock setting (see page 14):
Options: 0 Screen is unlocked (fully functional) 1 All functions locked except temperature controls and CANCEL key 2 Screen is fully locked
69-1815EFS-06
26
Owner's Manual - Page 29
...door is on page 22 for backlight options. "Err" appears on screen
• Contact your thermostat, please try the following suggestions. Your equipment may need service or repair.
27
69-1815EFS-06... to 32°C) • Cool: 50° to 99°F (10° to make sure the thermostat is normal. Display is blank
• Check circuit breaker and reset if necessary. • Make sure power ...
Owner's Manual - Page 30
... of difficulty
Heating or
• Press SYSTEM to set system to Cool. does not respond • Press SYSTEM to set system to restart safely, without damaging the compressor (see page 6).
69-1815EFS-06
28 Auto indicates the thermostat is set
lower than the Inside temperature. Make sure the temperature is following the...
Owner's Manual - Page 31
...the product is defective,
(i) return it, with a bill of sale or other rights which you purchased it (at 1-800-468-1502. This warranty does not cover removal or reinstallation ..., for a period of five (5) years from the date of purchase, to the place from which vary from state to state. This warranty gives you specific legal rights, and you may have any time during the warranty period the ...
Owner's Manual - Page 32
...; US Patent No. 6,208,263; 6,373,376; 6,448,901; 6,926,076; 7,044,397; Registered Trademark. © 2009 Honeywell International Inc. M.S. 07-09 D509151; Automation and Control Systems
Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Toronto, Ontario M1V 4Z9
http...
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