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User Guide  
Wi-Fi Programmable  
Thermostat  
RTH6500WF Wi-Fi Series  
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In the box you will find  
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Thermostat  
Wallplate (attached to thermostat)  
Screws and anchors  
Quick Start Guide  
Thermostat ID Card  
Wire labels  
User Guide  
Quick Reference Card  
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Welcome  
Congratulations on your purchase of a  
Honeywell Wi-Fi 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.  
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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Table of contents  
Unregistering thermostat...........................42  
Disconnecting Wi-Fi ..................................43  
Special features ........................................45  
Setting functions and options....................48  
About your new thermostat  
Controls and Home screen  
quick reference............................................5  
Preset energy-saving schedules.................6  
Installation  
Appendices  
Installing your thermostat............................8  
Connecting to your Wi-Fi network.............26  
Registering your thermostat online...........31  
Frequently asked questions ......................55  
Troubleshooting.........................................61  
Limited warranty........................................67  
Operation  
Setting the the time and day.....................36  
Setting the fan...........................................37  
Selecting system mode.............................38  
Adjusting program schedules....................39  
Overriding schedules temporarily .............40  
Overriding schedules permanently ...........41  
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Features of your Wi-Fi thermostat  
With your new thermostat, you can:  
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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:  
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Smart Response Technology  
Compressor protection  
Heat/cool auto changeover  
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Controls and 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.  
Set up messages  
describe steps in the  
Wi-Fi set up process  
Wi-Fi status  
Temperature adjustment  
buttons  
HOLD  
Permanent override  
button  
M31586  
Set clock, day,  
or schedule  
Select fan  
settings  
Select system  
mode  
Additional  
settings  
The screen lights when you press any button. It stays lit for 8 seconds after you complete  
changes.  
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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. To change the settings,  
see pages 39–41.  
Default Heat Settings  
Default Cool Settings  
WAKE  
70 °  
62 °  
70 °  
78 °  
6
:00 am  
LEAVE  
85 °  
78 °  
82 °  
8
:00 am  
RETURN  
6
:00 pm  
SLEEP  
0:00 pm  
62 °  
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Setting up your thermostat  
Setting up your Wi-Fi programmable thermostat is easy. It is preprogrammed and ready to  
go as soon as it is installed and registered.  
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3
Install your thermostat.  
Connect your home Wi-Fi 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  
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Installing your thermostat  
You might need the following tools to install this thermostat:  
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No. 2 Phillips screwdriver  
Small pocket screwdriver  
Pencil  
• Drill and bits (3/16” for drywall,  
/32” for plaster) (optional)  
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Hammer (optional)  
Electrical tape (optional)  
Level (optional)  
1
Switch OFF power to your  
heating/cooling system.  
or  
Important! To protect your equipment,  
switch OFF the power to your heating/  
cooling system at the breaker box or  
the system switch.  
Circuit breaker  
box  
Heating/cooling  
system power  
switch  
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Installing your thermostat  
2
Remove old thermostat faceplate  
and leave wires connected.  
If you have an older thermostat with a  
sealed mercury tube, turn to page 2  
for proper disposal instructions.  
2
a Take a picture of the wire  
connections for later reference.  
2
b If no wire is connected to a terminal  
labeled C or no C terminal exists  
on the old thermostat, view the  
Alternate Wiring videos at  
wifithermostat.com/videos  
C
Important! C wire is required and  
is the primary power source for  
your thermostat. Without a C wire,  
your thermostat will not power up.  
Terminal  
designation  
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Installing your thermostat  
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Label wires.  
Do not label by wire color.Use  
the supplied sticky tags to label  
each wire as you disconnect it.  
Label wires according to the old  
thermostat terminal designations,  
not by wire color.  
Sticky tags  
Blank sticky  
tags  
Note: If no tag matches a wire  
terminal label, write the terminal  
label on a blank tag.  
4
Remove wallplate.  
Remove the old wallplate from  
the wall after all wires have been  
labeled and disconnected.  
Terminal  
designation  
C
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Installing your thermostat  
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Separate Wi-Fi thermostat and its  
wallplate.  
Finger holds  
Thermostat  
On your new thermostat, grasp the  
finger holds on the top and bottom of  
the wallplate with one hand and the  
thermostat (front) with the other hand.  
Pull pieces apart.  
PULL HERE  
TO REMOVE  
PULL HERE  
TO REMOVE  
M33856  
Wallplate (back view)  
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Installing your thermostat  
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Mount wallplate for Wi-Fi thermostat.  
Mount your new wallplate using screws and anchors  
included with the thermostat.  
If necessary:  
Wallplate  
Drill 3/16-in holes for drywall.  
Drill 7/32-in holes for plaster.  
Note: You may be able to use your existing  
wall anchors. Hold the wallplate up to the  
existing anchors to check for alignment  
MCR33857  
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Installing your thermostat  
Important! The Wi-Fi thermostat requires a C wire to operate. The C, or common, wire  
brings 24 VAC power to the thermostat. Many older mechanical or battery operated  
thermostats do not require a C wire. If you don’t have a C wire, try:  
•
Looking for an unused wire that is pushed into the wall. Connect that wire to C and  
check that it is connected to the 24 VAC common at your heating/cooling system.  
Note: Not all heating/cooling systems label the 24 VAC common C. Check your system  
manual or contact the manufacturer to find out which terminal is the 24 VAC common.  
View the Alternate Wiring videos at wifithermostat.com/videos  
Wiring  
For conventional heating/cooling systems (natural gas, oil or electric furnace, air  
conditioner), see page 14. See “Glossary” on page 64 for further definition.  
For a heat pump system, see page 15. See “Glossary” on page 64 for further  
definition.  
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Installing your thermostat  
Wiring (conventional system)  
Remove metal jumper  
only if you have both  
R and RC wires  
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A Wire the Wi-Fi thermostat to your conventional system.  
a
Starting with the C Wire, match the sticky tag on the  
wire to the terminal labels.  
You must have a C wire. See page 13.  
b
Loosen screw, insert wire on inside edge  
of terminal, then tighten screw.  
K
K
Y2 W2  
G
W
C
Y
R
RC CONVENTIONAL  
RC HEAT PUMP  
c
Verify wire is firmly secured by gently  
pulling on wire.  
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e
Repeat steps a–c for all other wires.  
L
AUX/E G O/B  
C
Y
R
Push any excess wire back into the wall  
opening after all wires are installed.  
Note: The wiring for your  
application might be different  
from the shown above.  
f
Continue to page 20.  
Labels don’t match? See alternate  
wiring key on pages 16–17.  
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Installing your thermostat  
Wiring (heat pump system only)  
Labels don’t match? See alternate  
wiring key on pages 18–19.  
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B Wire Wi-Fi thermostat to your heat pump.  
a
Starting with the C Wire, match the sticky tag on the wire to the terminal labels.  
You must have a C wire. See page 13.  
b
c
Loosen screw, insert wire on inside edge  
of terminal, then tighten screw.  
Verify wire is firmly secured by gently  
pulling on wire.  
d
e
Repeat steps a–c for all other wires.  
Push any excess wire back into the wall  
opening after all wires are installed  
.
K
L
AUX/E G O/B  
C
Y
R RC  
HEAT PUMP  
f
Continue to page 20.  
Note: If old thermostat has separate wires on AUX and  
E, place both wires into the E/AUX terminal.  
If old thermostat has wire on AUX with a jumper to E,  
place wire on E/AUX terminal. No jumper is required.  
Note: The wiring for your  
application might be different  
from the wiring shown above.  
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Installing your thermostat  
Alternate wiring (conventional system)  
Use this if your wire labels don’t match the terminal labels.  
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Y2 W2 G  
W
C
Y
R
RC  
Note: You must have  
a C wire or equivalent.  
See page 13.  
F
W1  
H
X
B
C1  
Y1  
M
RH  
4
V
R
1
K Y2 W2 G  
W
C
Y
R RC3CONVENTIONAL  
MCR33885  
See key to –  
1 3  
on page 17.  
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Installing your thermostat  
Alternate wiring key (conventional system)  
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2
Do not use K terminal. For future use.  
If your old thermostat had both R and RH wires, remove metal jumper.  
Connect the R wire to the RC terminal, and the RH wire to the R terminal.  
Remove metal jumper connecting R and RC only if you must connect both  
R and RC.  
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Installing your thermostat  
Alternate wiring (heat pump system only)  
Use this if your wire labels don’t match the terminal labels.  
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2
4
4
5
6
Note: You must have  
a C wire or equivalent.  
See page 13.  
L
E
AUX  
G
O
C
Y
R
RC  
R
F
X
W
F
H
B
X
B
Y1  
M
V
VR  
X2  
W1  
W2  
1
7
K
L
AUX/E G O/B C  
Y
R RC HEAT PUMP  
MCR33886  
See key to –  
1 7  
on page 19.  
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Installing your thermostat  
Alternate wiring key (heat pump system only)  
1
2
Do not use K terminal. For future use.  
If old thermostat has separate wires on AUX and E, place both wires into the E/AUX terminal. If  
old thermostat has wire on AUX with a jumper to E, place wire on E/AUX terminal. No jumper is  
required.  
3
4
If your old thermostat had an O wire and not a B wire, attach the O wire to the O/B terminal.  
If your old thermostat had separate O and B wires, attach the B wire to the C terminal. If  
another wire is attached to the C terminal, check wifithermostat.com for help. Attach the O wire  
to the O/B terminal.  
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7
If your old thermostat had separate Y1, W1 and W2 wires, check wifithermostat.com for help.  
If your old thermostat had both V and VR wires, check wifithermostat.com for help.  
Leave metal jumper between R and RC terminals in place.  
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Installing your thermostat  
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Insert quick reference card.  
Quick  
reference  
card  
Fold quick reference card  
along score lines, and slide  
it into the slot on the back of  
the thermostat.  
Back of thermostat  
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Installing your thermostat  
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Attach thermostat to wallplate.  
Align the thermostat to the wallplate  
and then snap into place.  
HOLD  
M33860  
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Installing your thermostat  
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0 Switch heating/cooling system ON.  
Important!  
1
0a Verify that the C wire is  
connected at the thermostat  
and at the heating/cooling  
system.  
or  
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1
0b Make sure the heating/  
cooling system door is firmly  
secured.  
0c Switch power back ON for  
your heating/cooling system  
at the breaker box or its  
power switch.  
Circuit breaker  
box  
Heating/cooling  
system power  
switch  
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Installing your thermostat  
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1 Set clock to current day and time.  
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1
1a Press s or t to set clock.  
1b Press Set Day.  
HOLD  
1
1c Press s or t to select the  
day of week.  
MCR33908  
1
1d Press Done to save.  
Press and hold a st button to  
quickly change a setting.)  
(
HOLD  
MCR33909  
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Installing your thermostat  
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2 Determine your heating/cooling system type.  
Important! Heating/cooling system type must be set so that your  
thermostat operates properly and does not damage your system.  
12a If your system type is conventional single stage (natural gas-powered single  
stage with a/c), continue to “Connecting to your Wi-Fi networ