Honeywell T8400C Support Question
Honeywell T8400C Support Question
Find answers below for this question about Honeywell T8400C.Need a Honeywell T8400C manual? We have 2 online manuals for this item!
Question posted by Biliboy52 on December 8th, 2021
Blank Screen On T8400c Thermostat
what causes a blank screen on the thermostat?
Current Answers
Answer #1: Posted by SonuKumar on December 9th, 2021 8:01 AM
SonuKumar
Member since:
May 9th, 2021 Points: 16,621,300
Member since:
May 9th, 2021 Points: 16,621,300
Please respond to my effort to provide you with the best possible solution by using the "Acceptable Solution" and/or the "Helpful" buttons when the answer has proven to be helpful.
Regards,
Sonu
Your search handyman for all e-support needs!!
Related Honeywell T8400C Manual Pages
Owner's Manual - Page 1
M18539
1
69-1490
69-1490
Set
Room
FAN Auto On
SYSTEM Cool Off Heat
M18535
Em Ht Aux Ht
Set
Room
Electronic Thermostat
OWNER'S GUIDE
FAN Auto On
SYSTEM Cool Off Heat Em.Ht.
Owner's Manual - Page 2
... in an effort to provide you to use. Congratulations on the purchase of this thermostat in memory.
69-1490
2 You can easily read the current room temperature at ... a more comfortable and convenient living environment.
• Simple and easy to change your new thermostat! Over 100 years of Honeywell engineering expertise went into the making of your temperature setting.
•...
Owner's Manual - Page 3
... continuously.
Settings
Setting FAN and SYSTEM Switches
Fan and system settings are controlled by using FAN and SYSTEM switches located on the bottom of the thermostat case.
Owner's Manual - Page 8
... work or school.
If you like saving energy, but would like your thermostat to automatically change the temperature setting, you might want to 33% depending on your energy savings temperature ...settings. With this thermostat in the heating mode by lowering the temperature setting 5°F (3°C) to automatically save...
Owner's Manual - Page 10
See equipment manufacturer instructions. Heating or cooling does not come on the thermostat is below 50°F (10°C). Temperature setting is too warm or cool.
• Check that the SYSTEM switch on .
Troubleshooting Guide
CAUTION
To avoid ...
Owner's Manual - Page 11
For service, contact your local heating and cooling contractor:
11
69-1490 If you have questions concerning this thermostat, call Honeywell Customer Assistance at 1-800-468-1502, Monday-Friday, 7:00 am-5:30 pm, Central time.
Installation Instructions - Page 1
... Contact your application.
3. This thermostat is powered directly from the sun or appliances. -
The T8400C Thermostat is complete, check out product operation...thermostat where it carefully.
® U.S.
After installation is powered through the heating/ cooling system controls.
Failure to cool.
hot or cold air from heat to follow them could damage the product or cause...
Installation Instructions - Page 2
...appearance.
see Fig. 2) as follows:
1. The shape of the terminals permits insertion of thermostat. The T8400C Thermostat is powered through the wallplate entrance hole.
3. Disconnect the power supply to Fig. 5 and 6 for wiring the T8400C and T8401C Thermostats. See Fig. 3.
1 3-7/8 IN. The thermostat functions normally even when not level. Place the desired decorator cover plate and...
Installation Instructions - Page 3
... INSERTION STRIP 5/16 IN. (8 MM) C
TERMINAL SCREW
Fig. 4.
Use for most systems). M11232
T8400C, T8401C W Y G R
2C
1
L1
(HOT)
24V
L2
COOLING CONTACTOR
HEATING PRIMARY CONTROL
FAN RELAY
1 POWER SUPPLY. M11021B
Fig. 5.
T8400C AND T8401C ELECTRONIC THERMOSTATS
KEEP WIRING IN SHADED AREA
ALTERNATE MOUNTING SCREW HOLE
W
Y G
R C
MOUNTING SCREW HOLE
ALTERNATE MOUNTING...
Installation Instructions - Page 4
...thermostat controls the cooling system. T8400C AND T8401C ELECTRONIC THERMOSTATS
Slide the FAN switch in the bottom left corner of the thermostat to enter installer setup mode.
SYSTEM Switch
System switch settings control thermostat... on display and to select the desired fan setting. Heat: The thermostat controls the heating system.
Each press changes the setpoint one degree; M14681...
Installation Instructions - Page 5
...(This information is shown, but information displayed varies by the heating equipment and may cause compressor damage. After approximately ten seconds, the heating equipment should stop. Heating equipment ...section.
Heating Cycle Rates. The fan starts and stops with the heating equipment. T8400C AND T8401C ELECTRONIC THERMOSTATS
10. Press the t key to C1 or C3. Fan
1. Slide the ...
Similar Questions
Our Thermostat Screen T8400c 1024/u Went Blank .we Understand That Thi Thermos
We understand that this thermostat Is opsolet ,what we should replace With? .
We understand that this thermostat Is opsolet ,what we should replace With? .
(Posted by tedmusnicki 5 years ago)
Screen Is Blank And The Thermostat Doesn't Work
Thermostat is completely dead. What to do?
Thermostat is completely dead. What to do?
(Posted by milesweinberger 7 years ago)
Honeywell T8400c Thermostat Has Blank Display Fan Will Not Turn Off Honeywell
(Posted by LgbpNolo 10 years ago)
Thermostat Has Blank Screen, Heat Wont Work
i have no idea how to re set or get the thermostat to come on, just went blank sometime today while ...
i have no idea how to re set or get the thermostat to come on, just went blank sometime today while ...
(Posted by weinbower86 12 years ago)