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 LgbpNolo on January 7th, 2014
Honeywell T8400c Thermostat Has Blank Display Fan Will Not Turn Off Honeywell
The person who posted this question about this Honeywell product did not include a detailed explanation. Please use the "Request More Information" button to the right if more details would help you to answer this question.
Current Answers
Related Honeywell T8400C Manual Pages
Owner's Manual - Page 1
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. M18539
1
69-1490
69-1490
Owner's Manual - Page 2
Over 100 years of Honeywell engineering expertise went into the making of your new thermostat! You can easily read the current room temperature at a glance.
• No need for you with ... to use. Batteries are not required because your temperature setting.
• Large digital display. The ▲ and ▼ keys make it easy for batteries. Congratulations on the purchase of this...
Owner's Manual - Page 3
... heating equipment comes on the bottom of the thermostat case. Use for most homes.
On:
The fan runs continuously. Settings
Setting FAN and SYSTEM Switches
Fan and system settings are controlled by using FAN and SYSTEM switches located on . FAN Auto On
FAN SWITCH
M10273
3
69-1490
In cooling, the
fan goes off and on with the cooling...
Owner's Manual - Page 4
...
SYSTEM SWITCH
M10274
69-1490
4 Heat: Normal setting for months when your
equipment has failed or is on . Digital display shows a flame
when heating is not working properly.
Em. SYSTEM Cool Off Heat Em.Ht. Off:
Both heating and ...setting when your home needs heat, but your home
needs cooling (air conditioning).
Digital display
shows a snowflake when cooling is on .
Owner's Manual - Page 6
...
Room
INDICATOR
M18441
69-1490
6 The temperature setting and the room temperature are shown separately on the digital display, press either the ▲ or ▼ key once. Displaying Temperature Setting
NOTE: Your temperature setting can be set anywhere from 40° to 99°F (5° to Room when the room temperature is...
Owner's Manual - Page 8
... the day.
You can be conveniently programmed to automatically save energy.
69-1490
8 With this thermostat in the cooling mode by lowering the temperature setting 5°F (3°C) to 10°F (5&#... day before you leave for work or school.
Energy Savings
You can save energy with this thermostat, temperature settings can be as high as 7% to 33% depending on your home, where you...
Owner's Manual - Page 10
Heating or cooling does not come on the thermostat is below 50°F (10°C). Troubleshooting Guide
CAUTION
To avoid possible equipment damage, do not operate cooling when outside temperature is set to Heat ...
Owner's Manual - Page 11
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. For service, contact your local heating and cooling contractor:
11
69-1490
Owner's Manual - Page 12
Registered Trademark
69-1490 J.H. 9-00
6ww9w-1.h4o9ne0ywell.com/yourhome
12 Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario M1V 4Z9
Copyright © 2000 Honeywell
All Rights Reserved
® U.S. Automation and Control Solutions
Honeywell International Inc.
Installation Instructions - Page 1
... 5 ft (1.5m) above the floor in these instructions carefully. concealed pipes and chimneys. - The T8400C Thermostat is a precision instrument and was carefully adjusted at the factory.
Registered Trademark Copyright © 2002 Honeywell •
• All Rights Reserved
69- 1480- 1 Heating cycle rate is complete, check out product operation as an outside wall
behind...
Installation Instructions - Page 2
... PLATE (SELECT MODELS).
2 DRILL 3/16 INCH HOLES (IF DRYWALL) OR 7/32 (PLASTER OR WOOD)
WHEN USING WALL ANCHORS. Pull the thermostat wire through the entrance hole on the wall.
2.
The T8400C Thermostat is powered through the wallplate entrance hole.
3. All wiring must comply with local electrical codes and ordinances. M11041C
Fig. 2. Mounting Decorator...
Installation Instructions - Page 3
... onto the wallplate to latch.
M11232
T8400C, T8401C W Y G R
2C
1
L1
(HOT)
24V
L2
COOLING CONTACTOR
HEATING PRIMARY CONTROL
FAN RELAY
1 POWER SUPPLY.
Fig. 7. Mounting thermostat wallplate.
FAN Switch
Fan switch settings are controlled manually by the heating equipment and may start a few minutes after the heating equipment turns on (on most homes. In heating, the...
Installation Instructions - Page 4
... than one degree;
M14684
System setting at HEAT: If heat is on . T8400C AND T8401C ELECTRONIC THERMOSTATS
Slide the FAN switch in the bottom left corner of the thermostat to select the desired system setting. TEMPERATURE DISPLAY
Set
Room
INCREASE SETTING
DECREASE SETTING
FAN Auto On
SYSTEM Cool Off Heat
3. M14681
4. Each press changes the setpoint...
Installation Instructions - Page 5
...temperature setting above the room temperature. T8400C AND T8401C ELECTRONIC THERMOSTATS
10. Press the s key ...turns on the fan through a limit control.
Slide the SYSTEM switch to Cool and the FAN switch to Auto, if available.
2.
Press the s key to the thermostat. If the desired cycle is displayed. bRefer to manufacturer's recommendations.
1. Current configuration (CC) is displayed...
Installation Instructions - Page 6
Automation and Control Solutions
Honeywell
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario
M1V 4Z9
69-1480-1 G.H. Rev. 2-02
www.honeywell.com/yourhome
Similar Questions
Blank Screen On T8400c Thermostat
what causes a blank screen on the thermostat?
what causes a blank screen on the thermostat?
(Posted by Biliboy52 2 years ago)
Blank Display Screen
Thermostat in one part of the house shows a blank display and the cooling system was not operating. ...
Thermostat in one part of the house shows a blank display and the cooling system was not operating. ...
(Posted by schade5 11 years ago)
Blank Display On Heat Mode (rth230b1006)
After changing batteries in "off" mode, switched to "heat" mode and display is now blank. Display is...
After changing batteries in "off" mode, switched to "heat" mode and display is now blank. Display is...
(Posted by reedbenson 13 years ago)