Honeywell TH5110D Non-Programmable Thermostat Instruction Manual
- June 5, 2024
- Honeywell
Table of Contents
TH5110D Non-Programmable Thermostat
Instruction Manual
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
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Large, Clear, Backlit Display: Easy to see and read— even in the dark.
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Precise Comfort Control: ±1ºF of your set temperature.
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Simplified Operation: Soft-key controls.
Simultaneously displays both room temperature and temperature setting. -
Easy Change Battery Holder.
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Built-in Compressor Protection: Minimum-off timer protects the compressor from restarting too early after a shutdown.
GET TO KNOW YOUR THERMOSTAT
Thermostat
Display
OPERATE YOUR THERMOSTAT
Set System Setting
Press the System button to select Heat, Off, Cool, or Auto:
Heat—The thermostat controls the heating system.
Off— Both the heating and cooling systems are off.
Cool— The thermostat controls the cooling system.
Auto— Thermostat automatically changes between heating and cooling
operation, depending on indoor temperature. See the Auto Changeover section.
CAUTION
Equipment Damage Hazard.
Air conditioning compressor damage is possible.
Do not operate the cooling system when the 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.
REPLACE BATTERIES
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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. -
Press the battery holder latch to release the battery holder.
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Remove the battery holder from the thermostat.
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Remove the old batteries and insert two fresh AAA alkaline batteries as marked on the battery holder.
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Insert battery holder as shown.
REVIEW BATTERY TIPS
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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.
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Always use fresh AAA alkaline batteries.
Non-alkaline batteries do not last as long and can leak, causing damage to the thermostat. -
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. -
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” on the display.
When the minimum-off timer expires, “Cool On” or “Heat On” appears solidly on
the display and the compressor and the fan turn on.
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” appears
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.
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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. -
Press the Up or Down button to raise or lower the cool temperature setting.
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Press the Select Heat/Cool button to display the Heat temperature setting. “Select Heat/Cool” flashes for six seconds.
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Press the Up or Down button to raise or lower the heat temperature setting.
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“Select Heat/Cool” stops flashing six seconds after the last button press. The thermostat then returns to displaying “Auto” for the System setting.
Troubleshooting Tips
| If … | Then … |
|---|---|
| The display is blank. | • Check the circuit breaker to be sure it is not |
tripped.
• Check the power switch in the heating and/or cooling system to be sure it is
on.
• Check the 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).
The 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 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 heating system to respond.
• If all of this was checked, contact your local heating and cooling
contractor.
The 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 on the display (heat pumps only).| The compressor
minimum-off timer is active. Wait up to five minutes for the heating system to
turn on.
“Cool On” is flashing on the display.| The compressor minimum-off timer is
active. Wait up to five minutes for the cooling system to turn on.
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.
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
that 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 RESIDES 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
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 the United States
© 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.
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