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 bltkw08 on June 14th, 2017
Replacing My T8401c
When is it time to replace my T8401C thermostat, it displays the numbers one day then not the next day, is that a short some where or time for a new one?
Current Answers
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 Over 100 years of Honeywell engineering expertise went into the... making of your temperature settings are not required because your new thermostat! You can easily read the current room temperature at a glance.
• No need ...
Owner's Manual - Page 3
In heating, the fan may start a few minutes after
the heating equipment comes on the bottom of the thermostat case.
FAN Auto On
FAN SWITCH
M10273
3
69-1490 First set the FAN switch:
Auto: Normal setting for improved air
circulation and air quality. Use ...
Owner's Manual - Page 4
Then set the SYSTEM switch:
Cool: Normal setting for months when your home
needs heating. Digital display shows a flame
when heating is on .
Ht.: (Not available on all models.) Switch to this
setting when ...for months when your
equipment has failed or is not working properly. SYSTEM SWITCH
M10274
69-1490
4 Digital display
shows a snowflake when cooling is on .
Em.
Owner's Manual - Page 6
... setting can be set anywhere from 40° to 99°F (5° to Room when the room temperature is displayed.
1.
The temperature setting and the room temperature are shown separately on the digital display, press either the ▲ or ▼ key once. The ▼ indicator points to Set when the temperature setting...
Owner's Manual - Page 7
....
To raise the temperature setting, press the ▲ key. Changing Temperature Setting
1. When in the heating mode, lowering the temperature at night or during the day can lower your energy costs. Set
Room
M18442
2. Set
Room
M18443
7
69-1490
Owner's Manual - Page 8
...at night and during the day before you might want to consider purchasing the Honeywell Chronotherm® Programmable Thermostat. Energy Savings
You can save energy with this thermostat, temperature settings can be as...33% depending on your home, where you live, the number of energy saving periods you choose and your thermostat to automatically change the temperature setting, you leave for ...
Owner's Manual - Page 9
... HEATING COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY 10°F (5°C) DECREASE*
6 TO 8% 9 TO 11% 12 TO 13% 14 TO 15% 16 TO 18%
SAVINGS FOR TWICE-A-DAY 10°F (5°C) DECREASE*
12 TO ...HEAT
PERCENT OF COOLING COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY 10°F (5°C) INCREASE*
7 TO 9% 10 TO 11% 12 TO 14% 14 TO 19%
SAVINGS FOR TWICE-A-DAY 10°F (5°C) INCREASE*
11 TO 15% 16 ...
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....operate cooling when outside temperature is set to Heat or Cool.
• Check the system fuse or circuit breaker and replace or reset if necessary.
• Check for air movement at the register.
• Check power to the heating...
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
Installation Instructions - Page 1
... and T8401C Electronic Thermostats
INSTALLATION INSTRUCTIONS
The T8400C and T8401C Thermostats provide singlestage, non-programmable temperature control for 24V heating-cooling systems with good air circulation at average temperature. Temperature indication can be affected by non-volatile memory for °F or °C. MERCURY NOTICE
If this Product...
1. Can shock individuals or short...
Installation Instructions - Page 2
... desired decorator cover plate and the wallplate at the desired location on the left side of thermostat, restrict all wiring to Fig. 5 and 6 for wiring the T8400C and T8401C Thermostats. The shape of the terminals permits insertion of thermostat. DECORATOR COVER PLATE
WALL
1 2
WALL ANCHORS (2)
Wiring
IMPORTANT Use an 18-gauge maximum wire for typical...
Installation Instructions - Page 3
...
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. T8400C AND T8401C ELECTRONIC THERMOSTATS
KEEP WIRING IN SHADED AREA
ALTERNATE MOUNTING SCREW HOLE
W
Y G
R C
MOUNTING SCREW HOLE
ALTERNATE MOUNTING SCREW HOLE
WIRING ENTRANCE HOLE
MOUNTING SCREW HOLE
M11023
Fig...
Installation Instructions - Page 4
... for approxi-mately five seconds as follows:
Cool: The thermostat controls the cooling system. Each press of the s key momentarily displays 01. T8400C AND T8401C ELECTRONIC THERMOSTATS
Slide the FAN switch in the bottom left corner of the thermostat to select the desired system setting. Heat: The thermostat controls the heating system. Slide the SYSTEM switch in...
Installation Instructions - Page 5
...display °C or °F. Factory information is displayed, press the s key to lower the temperature setting several degrees above the room temperature. T8400C AND T8401C ELECTRONIC THERMOSTATS...C1 or C3. A typical example is shown, but information displayed varies by model. (This information is for factory use of a time delay relay or through a limit control. In conventional systems,...
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