Home » Honeywell » Thermostats » Honeywell T8401C

Honeywell T8401C Support Question

Find answers below for this question about Honeywell T8401C.
Need a Honeywell T8401C manual? We have 1 online manual for this item!

Honeywell Overview Questions Manuals Reviews Videos Research

Question posted by wordenp on November 18th, 2012

My Thermostat Will Not Light Up.

Honeywell T8401C 1072 (2) ... the screen will not light up at all. just changed over from cooling to heat. house breaker is on... no apparent breaker directly by air handler

I Know the Answer!

I have the same question
Request More Information

Current Answers

There are currently no answers that have been posted for this question.
Be the first to post an answer!

Remember that you can earn up to 1,100 points for every answer you submit. The better the quality of your answer, the better chance it has to be accepted.

Related Honeywell T8401C 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 temperature setting. • Large digital display. The ▲ and ▼ keys make it easy... room temperature at a glance. • No need for you with a more comfortable and convenient living environment. • Simple and easy to change your new thermostat! Congratulations on the purchase of this...

Owner's Manual - Page 3

... fan may start a few minutes after the heating equipment comes on with the cooling equipment. Use for most homes. FAN Auto On FAN SWITCH M10273 3 69-1490 On: The fan runs continuously. First set the FAN switch: Auto: Normal setting for improved air circulation and air quality. Settings Setting FAN and SYSTEM Switches Fan...

Owner's Manual - Page 4

... failed or is on . Then set the SYSTEM switch: Cool: Normal setting for months when your home needs heating. Digital display shows a snowflake when cooling is not working properly. SYSTEM Cool Off Heat Em.Ht. SYSTEM SWITCH M10274 69-1490 4 Heat: Normal setting for months when your home needs cooling (air conditioning). Em. Digital display shows a flame when...

Owner's Manual - Page 5

... these modes are not available on all models. Em Ht and Aux Ht Indications Emergency Heat (Em Ht) and Auxiliary Heat (Aux Ht) indications are active. Em Ht: Aux Ht: The ▲ indicator points to help handle the heating load. The ▲ indicator points to Aux Ht when the living space needs auxiliary...

Owner's Manual - Page 7

When in the heating mode, lowering the temperature at night or during the day can lower your energy costs. Set Room M18443 7 69-1490 Set Room M18442 2. To lower the temperature setting, press the ▼ key. To raise the temperature setting, press the ▲ key. Changing Temperature Setting 1. When in the cooling mode, raising...

Owner's Manual - Page 8

... choose and your thermostat to automatically change the temperature setting, you like saving energy, but would like your energy savings temperature settings. Energy Savings You can save energy with this thermostat, temperature settings can be conveniently programmed to consider purchasing the Honeywell Chronotherm® Programmable Thermostat. With this thermostat in the cooling mode by...

Owner's Manual - Page 9

...;F (5°C) DECREASE* 12 TO 18 TO 23 TO 25 TO UP TO 16% 22% 25% 29% 30% 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 ... INCREASE* 11 TO 15% 16 TO 18% 19 TO 22% 23 TO 33% COOL * YOUR SAVINGS DEPENDS ON HOME SIZE AND ACTUAL HEAT LOSS OR GAIN, GEOGRAPHIC LOCATION, FREQUENCY OF TEMPERATURES CHANGE, AND RANGE IN DEGREES OF...

Owner's Manual - Page 10

... fuse or circuit breaker and replace or reset if necessary. • Check for air movement at the register. • Check power to the heating or cooling equipment. • Adjust the temperature by pressing either the ▲ or ▼ key. 69-1490 10 See equipment manufacturer instructions. Heating or cooling does not come on the thermostat is below...

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

Automation and Control Solutions Honeywell International Inc. 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.