Honeywell Home TH5110D User manual

OPERATING INSTRUCTIONS
69-1713-01
Operating Instructions
TH5110D
NON-PROGRAMMABLE THERMOSTAT
The TH5110D Thermostat provides electronic control of
24 Vac single- stage heating and cooling systems or
750 mV heating systems.
For assistance with your product please visit
www.honeywellhome.com or call Customer Care toll free
at 1-800-468-1502.
Read and Save these Instructions
FEATURES
• Large, Clear, Backlit Display: Easy-to-see and read—
even in the dark.
• Precise Comfort Control: ±1ºF of your set
temperature.
• Simplified Operation: Soft-key controls.
Simultaneously displays both room temperature and
temperature setting.
• Easy Change Battery Holder.
• Built-in Compressor Protection: Minimum-off timer
protects compressor from restarting too early after a
shutdown.
GET TO KNOW YOUR
THERMOSTAT
Thermostat
Display
Inside
M37933A
Cool
Cool
Setting
Auto
Fan System
DIGITAL DISPLAY
FAN BUTTON
SYSTEM BUTTON
TEMPERATURE
SETTING BUTTON
TEMPERATURE
SETTING BUTTON
BATTERY
HOLDER
BATTERY HOLDER LATCH
M22084A
PRESS TO RELEASE
BATTERY HOLDER
RAISES
TEMPERATURE
SETTING
TWO AAA
ALKALINE
BATTERIES
LOWERS
TEMPERATURE
SETTING
SELECTS HEAT, OFF, COOL OR AUTO
SELECTS AUTO OR ON
PRESS
Replace Battery
H
eat
C
oo
l
On
On
In
s
i
de
S
ettin
g
CoolH
ea
t
H
eat
Cool
AutoOff
Sy
ste
m
F
an
O
n Aut
o
INSIDE
TE
M
PERAT
U
R
E
TEMPERATURE
SETTING
INDICATES
THERMOSTAT IS
"CALLING" FOR
HEAT OR COOL
CURRENT
SYSTEM SETTING
M22083
CURRENT
FAN SETTING
INDICATES BATTERIES ARE
LO
W AND M
US
T BE REPLA
C
E
D

TH5110D
69-1713—01 2
OPERATE YOUR THERMOSTAT
Set System Setting
Press the System button to select Heat, Off, Cool or Auto:
Heat—Thermostat controls the heating system.
Off—Both the heating and cooling systems are off.
Cool—Thermostat controls the cooling system.
Auto—Thermostat automatically changes between
heating and cooling operation, depending on indoor
temperature. See Auto Changeover section.
CAUTION
Equipment Damage Hazard.
Air conditioning compressor damage possible.
Do not operate cooling system when outdoor
temperature is below 50°F (10°C).
Set Fan Setting
Press the Fan button to select Auto or On:
Auto—Normal setting for most homes. The fan runs
only when the heating or cooling system is on.
On—The fan runs continuously. Use this setting for
improved air circulation or for more efficient air
cleaning.
Change Temperature Setting
Press the Up or Down button to select the desired
temperature setting.
NOTE: The first press of the Up or Down button turns on
the backlight. The second press of the Up or Down
button changes the temperature setting.
PRESS THE
SYSTEM BUTTON
TO SELECT HEAT,
OFF, COOL OR AUTO.
Replace BattReplace Batt
Service Needed
PRESS THE
FAN BUTTON
TO SELECT
AUTO OR ON.
Replace BattReplace Batt
Service Needed
Replace BattReplace Batt
Service Needed
PRESS THIS BUTTON TO
RAISE THE TEMPERATURE
SETTING
TEMPERATURE SETTING
TEMPERATURE SETTING RANGE:
HEAT: 40°TO 90°F (4.5°T0 32°C)
COOL: 50°TO 99°F (10°T0 37°C)
PRESS THIS BUTTON TO
LOWER THE
TEMPERATURE
SETTING

TH5110D
369-1713—01
REPLACE BATTERIES
1. When the Replace Battery indicator is flashing,
replace batteries promptly with two fresh
AAA alkaline batteries.
NOTE: The thermostat does not lose any settings when
the batteries are replaced; all settings are
permanently stored in memory.
2. Press the battery holder latch to release the battery
holder.
3. Remove the battery holder from the thermostat.
4. Remove the old batteries and insert two fresh AAA
alkaline batteries as marked on the battery holder.
5. Insert battery holder as shown.
Battery Tips
REVIEW BATTERY TIPS
1. Replace the batteries as soon as Replace Battery
flashes in the display. The Replace Battery indicator
flashes in the display two months before the
batteries run down completely.
2. Always use fresh AAA alkaline batteries.
Non-alkaline batteries do not last as long and can
leak, causing damage to the thermostat.
3. Although the thermostat has a Replace Battery
indicator, replace the batteries once per year to
prevent the thermostat and heating/cooling system
from shutting down due to a lack of battery power.
NOTE: Replacing the batteries once a year also helps
prevent battery leakage that can damage the
thermostat.
4. As a precaution, replace the batteries when leaving
your home for more than a month to prevent your
heating/cooling system from shutting down if the
batteries run down completely.
BUILT-IN COMPRESSOR
PROTECTION
The TH5110D Thermostat has built-in compressor
protection (minimum-off timer) that prevents the
compressor from restarting too early after a shutdown.
The minimum-off timer is activated after the compressor
turns off.
If there is a call during the minimum-off timer, the
thermostat flashes “Cool On” or “Heat On” a in the display.
When the minimum-off timer expires, “Cool On” or
“Heat On”aappears solidly in the display and the
compressor and the fan turn on.
_________
a Heat Pumps only.
Replace BattReplace Batt
Service Needed
Replace Battery
REPLACE BATTERY INDICATOR
M22110A
Replace Battery
Service NeededService Needed
BATTERY HOLDER
LATCH
BATTERY HOLDER
M22111A
M22017
BATTERY
HOLDER
PUSH
BATTERIES
OUT
THROUGH
THIS HOLE
BATTERY
DIRECTION
Replace Battery
Service NeededService Needed
BATTERY HOLDER
LATCH
BATTERY HOLDER
M22111A

TH5110D
69-1713—01 4
AUTO CHANGEOVER
Auto Changeover is a feature used in climates where both
air conditioning and heating are used on the same day.
The Auto setting appears only if the thermostat is set up
for Auto Changeover by your heating and air conditioning
dealer. In some installations, Auto may be the only system
selection.
The following pages in this Auto Changeover section
provide an example of how to change both the cool and
heat temperature settings when the system is set to Auto.
When you are adjusting the temperature setting, if
“Cool” or “Heat” appear in the display, the
temperature setting of the opposite mode is also being
adjusted. The thermostat automatically keeps the cool
and heat temperature settings three degrees apart (called
deadband). This three-degree deadband is not adjustable.
1. Press the System button to change the System
setting to Auto.
NOTE: The Auto setting appears only if the thermostat is
set up for Auto Changeover by your heating and
air conditioning dealer.
2. Press the Up or Down button to raise or lower the
cool temperature setting.
3. Press the Select Heat/Cool button to display the
Heat temperature setting. “Select Heat/Cool”
flashes for six seconds.
4. Press the Up or Down button to raise or lower the
heat temperature setting.
5. “Select Heat/Cool” stops flashing six seconds after
the last button press. The thermostat then returns to
displaying “Auto” for the System setting.
M22113A
PRESS THE
SYSTEM BUTTON
TO CHANGE
SYSTEM SETTING
TO AUTO.
Replace BattReplace Batt
Service Needed
PRESS THIS BUTTON TO
RAISE THE TEMPERATURE
SETTING
TEMPERATURE SETTING
M22114A
PRESS THIS BUTTON TO
LOWER THE TEMPERATURE
SETTING
SELECT HEAT/
COOL BUTTON
Replace Batt
Replace Batt
Service Needed
Replace Batt
Replace Batt
Service Needed
PRESS THIS BUTTON
TO RAISE THE
TEMPERATURE SETTING
TEMPERATURE SETTING
M22116A
PRESS THIS BUTTON
TO LOWER THE
TEMPERATURE
SETTING

TH5110D
569-1713—01
Troubleshooting Tips
If . . . Then . . .
Display is blank. •Check circuit breaker to be sure it is not tripped.
•Check power switch at heating and/or cooling system to be sure it is on.
•Check furnace door to be sure it is closed securely.
•If you use batteries, check that fresh AAA alkaline batteries are installed as marked on
the battery holder.
Temperature settings
do not change.
Check that the temperature settings are:
•Heating 40°F to 90°F (4.5°C to 32°C).
•Cooling 50°F to 99° F (10°C to 37°C).
Heating system does
not turn on.
•Set the system to Heat by pressing the System button.
•Check that the heat temperature setting is set above the room temperature and “Heat
On” shows solidly in the display.
•Check the circuit breaker to be sure it is not tripped.
•Check power switch at the heating and/or cooling system to be sure it is on.
•Check the furnace door to be sure it is closed securely.
•Wait five minutes for the heating system to respond.
•If all of this was checked, contact your local heating and cooling contractor.
Cooling system does
not turn on.
•Set the system to Cool by pressing the System button.
•Check the cool temperature setting to be sure it is set below room temperature and
“Cool On” shows solidly in the display.
•Check the circuit breaker to be sure it is not tripped.
•Check the power switch at the heating and/or cooling system to be sure it is on.
•Check the furnace door to be sure it is closed securely.
•Wait five minutes for the cooling system to respond.
•If all of this was checked, contact your local heating and cooling contractor.
“Heat On” is not shown
in the display.
Set System setting to Heat and set the temperature setting above the room temperature.
If “Heat On” is shown solidly in the display, but the heating system does not turn on, see
“Heating system does not turn on” in Troubleshooting Tips.
“Cool On” is not shown
in the display.
Set System setting to Cool and set the temperature setting below the room temperature. If
“Cool On” is shown solidly in the display, but the cooling system does not turn on, see
“Cooling system does not turn on” in Troubleshooting Tips.
“Heat On” is flashing
in the display (heat
pumps only).
Compressor minimum-off timer is active. Wait up to five minutes for the heating system
to turn on.
“Cool On” is flashing in
the display.
Compressor minimum-off timer is active. Wait up to five minutes for the cooling system
to turn on.

TH5110D
69-1713—01 6
CUSTOMER ASSISTANCE
For assistance with your product, please visit
www.honeywellhome.com or call Customer Care toll free
at 1-800-468-1502.
Before calling, please have the thermostat model number
and date code available.
M22047A
xxxxxxxx xxxxxx
THERMOSTAT
BATTERY HOLDER
MODEL NUMBER DATE CODE

TH5110D
769-1713—01
FIVE-YEAR LIMITED WARRANTY
Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal use and service, for
a period of five (5) years from the date of first purchase by the original purchaser. If at any time during the warranty period the product is
determined to be defective due to workmanship or materials, Resideo shall repair or replace it (at Resideo’s option).
If the product is defective,
(i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
(ii) call Resideo Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned
to the following address: Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can
be sent to you.
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Resideo that the defect was
caused by damage which occurred while the product was in the possession of a consumer.
Resideo’s sole responsibility shall be to repair or replace the product within the terms stated above. RESIDEO SHALL NOT BE LIABLE
FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR
INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDEO MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED
WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY
LIMITED TO THE FIVE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty
lasts, so the above limitation may not apply to you.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions
concerning this warranty, please write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.

TH5110D
© 2021 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates.
www.resideo.com
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
69-1713—01 M.S. Rev. 06-21 | Printed in United States