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Most Recent Honeywell TH9421 Questions
Touchscreen
The right side (temp control side) of the touchscreen is not responding. Opposite side responds as i...
The right side (temp control side) of the touchscreen is not responding. Opposite side responds as i...
(Posted by iamjam66 6 years ago)
I Need Wire Diagram For Th9421c 1004 Thormostat
(Posted by terrivarneyswet 8 years ago)
I Have This Thermostat That Was Installed New August 2008. It Controls Air Sou
(Posted by rjh04 10 years ago)
Hello! Why The Eim(th5421) W1(o/b) Termianl Can Not 24v In Heat Mode? Thanks
WHy the eim(th5421) w1(o/b) termianl can not 24v in heat mode?
WHy the eim(th5421) w1(o/b) termianl can not 24v in heat mode?
(Posted by mtjsky 11 years ago)
Honeywell Th9421c Cannot Raise Or Lower Temp. Screen Unlocked
(Posted by jonsan427 12 years ago)
Popular Honeywell TH9421 Manual Pages
Owner's Manual - Page 3
... settings. 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 12 Special features 13 Screen lock 14 Screen...
Owner's Manual - Page 5
... 9)
MON TUE WED THU
FRI
SAT SUN
OK TO PICK MULTIPLE DAYS
70 FAN Inside
AUTO
70 Set To
SYSTEM
HEAT
6:01 AM
Following Schedule
SCHED HOLD CLOCK SCREEN MORE
VisionPRO® IAQ
Press to adjust temperature settings (see pages 9-11) Press for more options
Press to override program schedule (see pages 10-11)
Press...
Owner's Manual - Page 7
...
Press CLOCK
6:01 AM
SCHED HOWLEDD CLOCK SCREEN MORE
70 70 FAN Inside
Set To
AUTO
Adjust time, then press DONE
6:02 AM
DONE
CANCEL
VisionPRO® IAQ
To set the current time display, press CLOCK, then press s or t to exit without changing the time). Note: To change the current week day display, see page...
Owner's Manual - Page 9
...
70 FAN Inside
AUTO
SYSTEM HEAT
6:01 AM
70 Set To
Following Schedule
SCHED HOLD CLOCK SCREEN MORE
Press 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...
Owner's Manual - Page 11
... SCHED, then EDIT.
2. Press other time periods (LEAVE, RETURN, SLEEP) to set Heat and Cool temperature for each.
6. 70 FAN Inside
AUTO
70 Set To
To
adjusWEDt
program Following Schedule
schedules
VisionPRO® IAQ
67:000 FAN Inside
AM
PrAeUTsOs SCHED
70 Set To
SCHED HOLD CLOCK SCREFESNoclhloewdMuiOnleRgE
6:00 Press EDIT
AM
DONE EDIT WAKE...
Owner's Manual - Page 13
... permanently adjust the temperature.
This will be maintained 24 hours a day until you manually change it or press CANCEL (or SCHED) to cancel "Hold" and resume the program schedule. Whatever temperature you set will turn off the program schedule. Program schedule override (permanent)
VisionPRO® IAQ
Press HOLD Adjust temperature
WED
70 FAN Inside
AUTO...
Owner's Manual - Page 15
... to Auto, the thermostat automatically selects heating or cooling depending on screen. Compressor Protection: This feature forces the compressor to wait a few minutes before restarting, to reactivate the alert timer. Before you set to help protect your house and possessions while you are away. (If this feature. Special features
VisionPRO® IAQ
Auto Changeover: When...
Owner's Manual - Page 17
... the thermostat.
Spray liquids onto a cloth, then use the damp cloth to clean the screen. Avoid abrasive cleansers. WED
Screen cleaning FAN
70 70 AUTO
Inside
SCREEN LOCKED Set To
Press SCREEN
Following Schedule
6:00PM
SCHED HOLD CLOCK SCREEN MORE
Screen lock timer (30 seconds)
30 OK TO CLEAN SCREEN
VisionPRO® IAQ
Press SCREEN to lock the screen for cleaning. The screen will...
Owner's Manual - Page 19
...
Press MORE until the humidifier screen is displayed, then press s or t to exit without further adjustment. Humidification control
VisionPRO® IAQ
Set Frost Control & humidity 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...
Owner's Manual - Page 21
...the ventilation screen is displayed, then press s or t to set the ventilation timer. You can ventilate your home as needed. Ventilation can still be requested by the installer, the thermostat will turn ...set ventilation timer
AUTO
DONE
40 VENT
Minutes
CANCEL
Press to save and exit, or press CANCEL to exit without saving changes. Press DONE to save & exit
VisionPRO® IAQ
You can set...
Owner's Manual - Page 23
...
Year setting (second two digits)
Function 0130
Press s/t to change the last two digits of the year:
Options: 01 - 99 (i.e., 2001 - 2099)
Month setting
Function 0140
Press s/t to change the current month:
Options: 01 - 12 (i.e., January - December)
Date setting
Function 0150
Press s/t to change the current date:
Options: 01 - 31
21
VisionPRO® IAQ 69...
Owner's Manual - Page 25
... that use
the new 2007 DST calendar)
23
69-1815EFS-06 Advanced functions
VisionPRO® IAQ
Temperature format (°F/°C)
Function 0320
Press s/t to set the temperature display format:
Options: 0 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...
Owner's Manual - Page 27
Advanced functions
VisionPRO® IAQ
Humidifier pad change reminder
Function 0510
This feature displays an alert to remind you ... (see page 13):
Options: 0 Off 1 On
25
69-1815EFS-06 Press s/t to set the desired interval:
Options:
0 Off (no reminder to change the humidifier pad. Press s/t to set the desired interval:
Options:
0 Off (no reminder to change UV lamp) 1 Reminder after...
Owner's Manual - Page 29
... normal. Display is blank
• Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is closed securely. Most problems can be corrected quickly and easily. "Err" appears on screen
• Contact your thermostat, please try the following suggestions. In case of difficulty
VisionPRO® IAQ
If you have difficulty...
Owner's Manual - Page 31
... sent to you . 5-year limited warranty
VisionPRO® IAQ
Honeywell warrants this product, excluding battery, to be defective or malfunctions, Honeywell shall repair or replace it (at 1-800-468-1502. If the product is shown by Honeywell that the defect or malfunction was in the workmanship or materials, under normal use and service, for a period of five (5) years...
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