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Honeywell RTH8500 Series User Manual

Honeywell RTH8500 Series
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User Guide
Read and save these
instructions.
For help please visit
yourhome.honeywell.com
RTH8500
Wi-Fi Series
Wi-Fi Touchscreen
Programmable
Thermostat
In the box you will find
Thermostat
Wallplate (attached to thermostat)
Screws and anchors
Coin cell battery (inside the back
of the thermostat)
Quick Start Guide
Thermostat ID Card
Wire labels
User Guide
This is a legacy product document
supported by Resideo. It is no
longer manufactured

Table of Contents

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Honeywell RTH8500 Series Specifications

General IconGeneral
Programmability7-day programmable
Wi-FiNo
Operating ModesHeat, Cool, Auto, Off
Fan ModesAuto, On, Circulate
Hold FeatureYes
Filter Change AlertYes
Stages2 heat / 2 cool
Temperature Range40°F to 90°F (4.5°C to 32°C)

Summary

Welcome

About Your New Thermostat

Home Screen Quick Reference

Overview of the thermostat's main display screen and its interactive elements.

Preset Energy-Saving Schedules

Details default thermostat settings for reducing heating and cooling expenses.

Installation

Installing Your Thermostat

Step-by-step guide to physically mounting and connecting the thermostat to the wall.

Connecting to Your Wi-Fi Network

Instructions for linking the thermostat to your home's wireless internet connection.

Registering Your Thermostat Online

Steps to create an account and register the thermostat for remote access.

Operation

Setting the Clock

How to set the current date and time on the thermostat display.

Setting the Fan

Instructions for configuring the fan operation mode (ON or AUTO).

Selecting System Mode

How to choose between heating, cooling, auto, or off modes for the HVAC system.

Adjusting Program Schedules

Guide to setting daily temperature schedules for different time periods.

Overriding Schedules Temporarily

How to make temporary temperature adjustments without changing the main schedule.

Overriding Schedules Permanently

How to hold a specific temperature indefinitely, overriding programmed schedules.

Setting Vacation Hold

Suspending the program schedule for extended periods away from home.

Setting Filter Reminder Intervals

Configuring alerts for replacing the furnace filter based on runtime.

Features of Your Wi-Fi Thermostat

Home Screen Quick Reference

Preset Energy-Saving Schedules

Software Updates

Smart Response Technology

Compressor Protection

Auto Changeover

Setting Functions and Options

System Setup

Device Name

Assigns a name to identify the thermostat when viewed remotely.

Year Setting (First Two Digits)

Sets the first two digits of the year for date settings.

Year Setting (Last Two Digits)

Sets the last two digits of the year for date settings.

Month Setting

Sets the current month for date settings.

Date Setting

Sets the current day of the month for date settings.

Schedule Options

Enables or disables the 7-day programmable schedule feature.

Restore Schedule Defaults

Restores programmed schedule to energy saving settings.

Select System Type

Configures the thermostat for specific heating and cooling system types.

Heating Fan Control

Sets fan operation for gas/oil or electric heating systems.

Heat Pump Changeover Valve

Configures the valve for heat pumps based on O or B wire connection.

Heating Cycle Rate

Sets cycle rate for gas/oil or electric furnaces.

Heating Cycle Rate Stage 2

Sets cycle rate for hot water or high-efficiency furnaces.

Backlight

Controls the thermostat screen backlight behavior.

Manual/Auto Changeover

Sets manual or automatic switching between heating and cooling modes.

Temperature Format (°F/°C)

Selects the display format for temperature readings.

Automatic Daylight Saving Time Adjustment

Enables or disables automatic adjustment for daylight saving time.

Filter Change Reminder

Sets reminders for replacing the furnace filter based on run time.

Smart Response Technology

Allows thermostat to learn system response times for scheduled temps.

Clock Format

Selects between 12-hour or 24-hour clock display.

Restore Original Settings

Disconnects from Wi-Fi and restores original thermostat settings.

Wi-Fi On/Off

Enables or disables the thermostat's Wi-Fi functionality.

Wi-Fi Connection

Manages the thermostat's connection status to the Wi-Fi network.

Frequently Asked Questions

Message Center Messages

Troubleshooting

Display is Blank

Steps to resolve issues when the thermostat screen is not displaying anything.

Cannot Change System Setting to Cool

Troubleshooting steps for when the system cannot be set to cooling mode.

Fan Not Turning On When Heat is Required

Diagnosing why the fan is not operating during heating cycles.

'Wait' Appears on the Screen

Understanding the 'Wait' message related to compressor protection.

Heat Pump Issues (Incorrect Airflow)

Resolving issues with heat pumps delivering incorrect air temperature.

Button on Lower Right of Screen is Blank

Explanation for why the lower right button might be blank.

Red Light is On

Interpreting the red light indicator, especially in Emergency Heat mode.

Heating or Cooling System Does Not Respond

Steps to take when the heating or cooling system fails to activate.

Heating System Running in Cool Mode

Troubleshooting why the heating system operates during a cooling demand.

Glossary

1-Year Limited Warranty

Regulatory Information

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