Honeywell RTH8500 Series User manual

User Guide
Wi-Fi Touchscreen
Programmable Thermostat
RTH8500 Wi-Fi Series

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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

Welcome
Congratulations on your purchase of a
Honeywell Wi-Fi touchscreen programmable
thermostat. When registered to Honeywell’s
Total Connect Comfort Solutions, you can
remotely monitor and control the heating and
cooling system in your home or business—you
can stay connected to your comfort system
wherever you go.
Honeywell’s Total Connect Comfort is the
perfect solution if you travel frequently, own
a vacation home, a business or manage an
Investment property or if you are simply looking
for peace of mind.

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This thermostat works with common 24 volt systems such as forced air, hydronic,
heat pump, oil, gas, and electric. It will not work with millivolt systems, such as a gas
fireplace, or with 120/240 volt systems such as baseboard electric heat.
This thermostat contains a Lithium battery which may contain Perchlorate material.
Perchlorate Material—special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
MERCURY NOTICE: Do not place your old thermostat in the trash if it contains
mercury in a sealed tube. Contact the Thermostat Recycling Corporation at www.
thermostat-recycle.org or 1-800-238-8192 for information on how and where to
properly and safely dispose of your old thermostat.
NOTICE: To avoid possible compressor damage, do not run air conditioner if the
outside temperature drops below 50°F (10°C).
Need help?
Visit wifithermostat.com or call 1-855-733-5465 for assistance before returning the
thermostat to the store.

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About your new thermostat
Home screen quick reference .....................5
Preset energy-saving schedules.................6
Installation
Installing your thermostat............................8
Connecting to your Wi-Fi network.............26
Registering your thermostat online ...........31
Operation
Setting the clock........................................36
Setting the fan...........................................37
Selecting system mode.............................38
Adjusting program schedules....................39
Overriding schedules temporarily .............40
Overriding schedules permanently ...........41
Setting vacation hold.................................42
Setting filter reminder intervals .................43
Cleaning the screen..................................44
Unregistering thermostat...........................45
Disconnecting Wi-Fi ..................................46
Special features ........................................48
Setting functions and options....................51
Appendices
Frequently asked questions ...................... 59
Message center messages.......................62
Troubleshooting.........................................65
Limited warranty........................................71
Table of contents

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Features of your Wi-Fi thermostat
With your new thermostat, you can:
• Connect to the Internet to monitor and control your heating/cooling system
• View and change your heating/cooling system settings
• View and set temperature and schedules
• Receive alerts via email and get automatic upgrades
Your new thermostat provides:
• Smart Response Technology
• Compressor protection
• Heat/cool auto changeover

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Home screen quick reference
Once your Wi-Fi thermostat is installed, it will display the home screen. Portions of this
display will change depending on how you are viewing it. To change settings, simply press
the appropriate area lightly with your finger.
Unless you change the lighting function, the screen is always lit at low intensity. When you
touch the screen, the screen brightens.
Set clock
Message center
Select fan mode
Select system mode
Program schedules
Override schedule
Wi-Fi status
Schedule is on (does not
display when off)
Additional settings
Lock screen for cleaning
M31565
MORE
Inside

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Preset energy-saving schedules
This thermostat is pre-set with energy-saving program settings for four time periods.
Using the default settings can reduce your heating/cooling expenses if used as directed.
Savings may vary depending on geographic region and usage.
Default Heat Settings Default Cool Settings
WAKE
6:00 am 70 °78 °
LEAVE
8:00 am 62 °85 °
RETURN
6:00 pm 70 °78 °
SLEEP
10:00 pm 62 °82 °
To change the settings, see pages 39–42.

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Setting up your thermostat
Setting up your Wi-Fi programmable touchscreen thermostat is easy. It is preprogrammed
and ready to go as soon as it is installed and registered.
Install your thermostat.
Connect it to your home wireless network.
Register online for remote access.
Before you begin, you may want to watch a brief installation video.
Use the QR Code®at the front of this guide, or go to
wifithermostat.com/support
2
3
1

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Installing your thermostat
You might need the following tools to install this thermostat:
• No. 2 Phillips screwdriver
• Small pocket screwdriver
• Pencil
• Level (optional)
• Drill and bits (3/16” for drywall,
7/32” for plaster) (optional)
• Hammer (optional)
• Electrical tape (optional)
1 Switch OFF power to your
heating/cooling system.
Important! To protect your equipment,
switch OFF the power to your heating/
cooling system at the breaker box or
the system switch.
or
M31535
Circuit
breaker
box
Heating/cooling
system power
switch