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Honeywell T8131C User Manual

Honeywell T8131C
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1
69-0908—1
Weekday/Weekend
Programmable Heat and/or Cool
Thermostat and Mounting Plate
OWNER’S GUIDE
69-0908-1
/
T8131C
Programmable Thermostat
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Honeywell T8131C Specifications

General IconGeneral
Power SourceBattery or Hardwired
Display TypeDigital
Stages1 Heat / 1 Cool
Terminal DesignationsR, W, Y, G
MountingWall Mount
Temperature Control Range40 to 90°F (4 to 32°C)
ApplicationResidential

Summary

Programmable Thermostat Overview

Programming Thermostat

Understanding the WAKE Period

Details how to set the WAKE period for comfortable morning temperatures and includes lead time considerations.

Understanding the LEAVE Period

Explains setting the LEAVE period for energy-saving temperatures when away at work or school.

Understanding the RETURN Period

Details setting the RETURN period for comfortable temperatures before bedtime, including lead time.

Understanding the SLEEP Period

Describes setting the SLEEP period for energy-saving temperatures during nighttime hours.

Program Schedule

Heating Program Schedule Setup

Details the schedule for setting start times and heating temperatures for weekdays and weekends.

Cooling Program Schedule Setup

Details the schedule for setting start times and cooling temperatures for weekdays and weekends.

T8131C Programming Guide

Setting Current Time and Day

Instructions on how to set the current time and day on the thermostat for accurate programming.

Programming the Heating Schedule

Guide to programming the heating schedule, including setting WAKE, MON-FRI, and temperature.

Programming the Cooling Schedule

Guide to programming the cooling schedule, following similar steps as the heating program.

Operating and Changing Settings

Temporarily Changing Temperature

How to temporarily adjust the temperature for the current period without altering the program.

Holding a Temperature

Instructions for setting a fixed temperature indefinitely, and how to cancel the hold.

Checking Programs

How to review programmed times and temperatures for both weekday and weekend schedules.

Canceling a Program

Steps to cancel a programmed schedule on the thermostat.

Permanently Changing a Program

Instructions on how to permanently modify an existing program schedule.

Returning to Normal Program

How to exit programming mode and return to the thermostat's normal operating state.

Setting Fan and System Switches

Setting the Fan Switch

Explains the AUTO and ON settings for the fan switch and their operational implications.

Setting the System Switch

Details the COOL, OFF, and HEAT settings for the system switch and their functions.

Installing Batteries

Troubleshooting Guide

Troubleshooting: Display Not Coming On

Solutions for when the thermostat display remains blank.

Troubleshooting: Temperature Setting Limits

Explanation for temperature display limits during programming.

Troubleshooting: Incorrect Program Times

Diagnosing and correcting issues with temperature changes happening at incorrect times.

Troubleshooting: Heating Not Working

Steps to resolve issues where the heating system fails to activate.

Troubleshooting: Cooling Not Working

Solutions for when the air conditioning system fails to activate.

Troubleshooting: House Temperature Issues

Addressing problems where the house is too warm or too cool.

Troubleshooting: No Heat at Registers

Diagnosing why heat is not reaching registers when the system is on.

Troubleshooting: Incorrect Cycle Times

Resolving issues with HVAC system cycles being too short or too long.

Troubleshooting: Battery Indicator Error

Resolving the 'bAt Lo' display error after installing new batteries.

Limited One-Year Warranty

Toll-free Customer Assistance

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