Honeywell YTH9421 Support Question
Honeywell YTH9421 Support Question
Find answers below for this question about Honeywell YTH9421.Need a Honeywell YTH9421 manual? We have 1 online manual for this item!
Question posted by edandbin on January 4th, 2013
Do I Need A New Thermostat?
Last night part of the touch screen of my Honeywell YTH9421c1004 got zapped with static electricity from my finger. The item still functions as is, but I cannot change any settings. Is there a way to re-program this thing or must I buy a new one? Are there cheper alternatives to this thermostat that are compatable with a Lennox G24M furnace and can I install and program the thermo myself?
Current Answers
Related Honeywell YTH9421 Manual Pages
Owner's Manual - Page 2
... pending. 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. Need Help? Registered Trademark. US Patent No. 6,208,263; 6,373,376; 6,448...
Owner's Manual - Page 3
...® 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 cleaning 15 Optional remote sensors...
Owner's Manual - Page 4
... 8 am, return at 6 pm and go . Select system setting: Preset to Auto See page 6 3. Just set the time and day. Select fan setting: Preset to Heat See page 7 4. 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. Then check the settings below and change if needed: 1.
Owner's Manual - Page 5
... 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 to set clock (see page 5)
Press to lock keypad...
Owner's Manual - Page 6
... to unlock
69-1815EFS-06
4
Temperature setting
Program schedule on (does not display when off)
Adaptive Intelligent Recovery in effect (see page 13)
Inside humidity (If an outdoor sensor is installed, the outdoor temperature is activated • Wait: Compressor protection activated (see page 13) • Screen Locked: See page 26 to display the...
Owner's Manual - Page 7
... time, and stores all date/time information. Note: To change the current week day display, see page 21.
5
69-1815EFS-06 WED
Clock setting
70 FAN Inside
AUTO
70 Set To
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...
Owner's Manual - Page 8
... runs only when the heating or cooling system is programmed, "Auto" will remain active until you 've programmed for more information).
69-1815EFS-06
6 Operating Manual
Fan setting
WED
70 FAN Inside
AUTO
SYSTEM HEAT
6:01 AM
70 Set To
Following Schedule
SCHED HOLD CLOCK SCREEN MORE
Press FAN
Note: If a fan schedule is on...
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...
Owner's Manual - Page 10
... maximum cost savings
It's easy to use EnergyStar® program settings. We recommend these settings, since they can program four time periods each day, with different settings for maximum energy savings. This thermostat is pre-set to program your heating/cooling expenses by as much as 33%. (See next page to adjust times and temperatures of each day...
Owner's Manual - Page 12
... resume and set the temperature to the level you set timer
Press s or t to immediately adjust the temperature.
The new temperature will resume. Operating Manual
Program schedule override (temporary)
Adjust temperature
WED
70 FAN Inside
AUTO
SYSTEM
HEAT
Hold Temperature Until
8:00AM
73 Set To
HEAT
Heat On
78 COOL
SCHED HOLD CLOCK SCREEN MORE CANCEL...
Owner's Manual - Page 15
... humidity while your installer.)
13
69-1815EFS-06 Special features
VisionPRO® IAQ
Auto Changeover: When set .
Southern Away Dehumidification: Your system may be programmed 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 activate this...
Owner's Manual - Page 17
... normal operation, or press SCREEN again if you can clean the screen without changing any liquid directly on the thermostat. Note: Do not spray any settings. SCHED HOLD CLOCK SCREEN MORE
15
69-1815EFS-06 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...
Owner's Manual - Page 18
... temperature at the location of temperature readings from all sensors or an average between the thermostat and the sensor(s).
69-1815EFS-06
16
If an indoor remote sensor is installed, ...remote sensors
WED
70 FAN Inside
AUTO
SYSTEM HEAT
6:01 AM
70 Set To
Following Schedule Outside
43
SCHED HOLD CLOCK SCREEN MORE
Inside temperature
Outside temperature
If an outdoor sensor is installed, ...
Owner's Manual - Page 19
... appears on windows, lower the frost setting. Wait at least 1 day before adjusting the frost level again. Once frost no longer appears, the thermostat will not be displayed.
17
69-1815EFS-06
Press DONE to save & exit
5
FROST DEHUMIDIFIER
55
CANCEL
Press MORE until the humidifier screen is displayed, then press s or t to...
Owner's Manual - Page 20
...-06
18 Press DONE to save & exit
CANCEL
Press MORE until the dehumidifier screen is displayed, then press s or t to set the desired humidity level and operation (Auto or Off). If installed to control a dehumidifier, the thermostat can activate it as needed to reduce humidity (may cool as much as 3°F lower than your...
Owner's Manual - Page 21
... requested by the installer, the thermostat will turn off /on the automatic ventilation only. Ventilation control
Press to set ventilation timer
AUTO
DONE
40 VENT
Minutes
CANCEL
Press to save and exit, or press CANCEL to exit without saving changes. To turn off the ventilator, select 0. If programmed for auto-ventilation by using the...
Owner's Manual - Page 24
...0165
Press s/t to restore default Energy Star settings:
Options: 0 No change 1 Restore factory default Energy Star settings
Backlight
Function 0280
Options:
Press s/t to turn the program schedule on or off:
Options: 0 Program schedule is off.
Operating Manual
Advanced functions
Program schedule on/off
Function 0160
Press s/t to select how the screen is lighted:
0 Light on for approx...
Owner's Manual - Page 25
... 2006, and for daylight savings time 1 On: Auto-change to daylight savings time. 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...
Owner's Manual - Page 29
... is normal.
Make sure heating and cooling temperatures are set to acceptable ranges: • Heat: 40° to 90°F (4.5° to 32°C) • Cool: 50° to 99°F (10° to make sure the thermostat is closed securely. Your equipment may need service or repair.
27
69-1815EFS-06
Most...
Owner's Manual - Page 30
...furnace door is closed securely.
• If "Wait" is displayed, the compressor protection timer is on.
Auto indicates the thermostat is set system to restart safely, without damaging the compressor (see page 6).
69-1815EFS-06
28 Operating Manual
In case of difficulty
...is scheduled for the system to Cool. Make sure the temperature is following the programmed fan setting.
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