Honeywell RTH3100C Digital Thermostat Owner’s Manual
- June 7, 2024
- Honeywell
Table of Contents
RTH3100C
Owner’s Manual
This is a legacy product document supported by Resideo. It is no longer
manufactured
Non-Programmable Digital Thermostat
Read and save these instructions. For help please visit yourhome.honeywell.com
Installation is Easy
- Label wires and remove your old thermostat
- Install and wire your new thermostat
- Set your new thermostat to match your heating/cooling system
| Do
you need assistance? We are here to help.
Call 1-800-468-1502 for wiring
assistance before returning
the thermostat to the store.
For use with Heat Pump Systems ONLY.
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ATTENTION: MERCURY RECYCLING NOTICE
This product does not contain mercury. However, this product may replace a
product that contains mercury. Mercury and products containing mercury should
not be discarded in household trash.
For more information on how and where to properly recycle a thermostat
containing mercury in the United States, please refer to the Thermostat
Recycling Corporation at
www.thermostat-recycle.org
For mercury thermostat recycling in Canada,
please refer to Switch the Stat at
www.switchthestat.ca|
NO MERCURY NO BOTE
MERCURIO
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NOTICE: To avoid possible compressor damage, do not run air conditioner if the outside temperature drops below 50°F (10°C).
Customer assistance
For assistance with this product, please visit http://yourhome.honeywell.com
Or call Honeywell Customer Care toll-free at
1-800-468-1502.
To save time, please note your model number and date code before calling.
Pull at the bottom to remove the thermostat from wallplate.
Turn the thermostat over to find the model number and date code.
Turn Off Power to Heating/Cooling System
Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them. If any
wires are not attached to terminals in your old thermostat, do not connect
them to your new thermostat.
Wrap the bare metal ends of each unused wire with electrical tape, so it
cannot touch and short out other wires.
Separate Wallplate from New Thermostat
Remove the wallplate from the new thermostat and mount it onto the wall.
Mount Wallplate
Mount the new wallplate using the included screws and anchors.
Drill 3/16-in. holes for drywall
Drill 3/32-in. holes for plaster
Connect Wires
- Match each labeled wire with the same letter on the terminal.
- Use a screwdriver to loosen screw terminals, insert wires, then tighten screws.
- Push any excess wire back into the wall opening.
If labels do not match letters on the thermostat, check “Alternate Wiring” on page 6 and connect to terminal as shown (see notes, below).
Alternate Wiring
- If the old thermostat had both V and VR wires, contact a heating/cooling contractor for help.
- If the old thermostat had both O and B wires, attach the B wire to the C terminal. If another wire is attached to the C terminal, call 1-800-468-1502 for help.
- If the old thermostat had W1, W2 and Y wires, contact a heating/cooling contractor for help.
- If no wire matches the E terminal on the new thermostat, use a small piece of wire to connect terminals E and Aux.
Install Batteries
Install two AA alkaline batteries.
Install Thermostat onto Wallplate
Install thermostat onto the wall plate on the wall.
Turn Power Back On
Turn the power back on to the heating/cooling system.
System Setup
System Setup
Enter System Setup
Next, you must set the thermostat to control the heating and cooling system in
your home. To enter system setup, press and hold both the and buttons until
the display changes (approximately 5 seconds).
Changing Settings
- Press to change the setting.
- Press to advance to the next function.
- Press and hold and to exit and save settings.
| Function | Description Press the button to | Setting |
|---|---|---|
| 6 | select your auxiliary heating |
system and optimize its
operation| 3 Heat pump
8| select your emergency heating
system and optimize its
operation| 9 Electric furnace: Use this setting if you have any type of
electric heating system.
14| select Fahrenheit or Celsius
temperature display| 0 Fahrenheit temperature display (°F)
1 Celsius temperature display (°C)
About your new thermostat
Your new Honeywell thermostat has been designed to give you many years of reliable service and easy-to-use, push-button climate control.
- One-touch temperature controls
- Large, clear backlit display is easy to read, even in the dark
- Switchable fan control (auto or continuous fan)
- Displays both room temperature and temperature setting
- Built-in compressor protection
Thermostat controls
Display screen
Cool on: Cooling system is on.
Heat on: Heating system is on.
Em: Emergency heat is on.
Aux: Auxiliary heat is on.
When Cool On/Heat On is flashing, compressor protection is engaged (see page
10).
Built-in compressor protection
This feature helps prevent damage to the compressor in your air conditioning
or heat pump system.
Damage can occur if the compressor is restarted too soon after shutdown. This
feature forces the compressor to wait 5 minutes before restarting.
During the wait time, the display will flash the message Cool On or Heat On.
When the safe wait time has elapsed, the message stops flashing and the
compressor turns on.
Battery replacement
Batteries are optional if your thermostat was wired for AC power when
installed. Install fresh batteries immediately when the REPLACE BATT warning
begins flashing.
Even if the warning does not appear, you should replace batteries once a year,
or before leaving home for more than a month.
Batteries provide backup power to the display during power interruptions. All
settings are permanently stored in memory and do not require battery power.
Accessories/replacement parts
To order, please call Honeywell Customer Care toll-free at
1-800-468-1502.
Cover plate………………..Part No. 50002883-001
Use to cover marks left by old thermostats.
Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.
Display is
blank| • Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
• Make sure fresh AA alkaline batteries are correctly
installed.
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Heating
or cooling
system does
not respond| • Set system switch to Heat. Make sure the temperature is
set higher than the Inside temperature.
• Set system switch to Cool. Make sure the temperature is
set lower than the Inside temperature.
• Wait 5 minutes for the system to respond.
Temperature settings do
not change| Make sure heating and cooling temperatures are set to
acceptable ranges:
• Heat: 40° to 90°F (4.5° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
“Cool On” or
“Heat On” is
flashing| • Compressor protection feature is engaged. Wait 5 minutes
for the system to restart safely, without damage to the
compressor.
“Heat On” is
not displayed| • Set the System switch to Heat, and set the temperature
level above the current room temperature.
“Cool On” is
not displayed| • Set the System switch to Cool, and set the temperature
level below the current room temperature.
For assistance with this product, please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.
1-year limited warranty
Honeywell warrants this product, excluding battery, to be free from defects in
the workmanship or materials, under normal use and service, for a period of
one (1) year from the date of purchase by the consumer. If at any time during
the warranty period the product is determined to be defective or malfunctions,
Honeywell shall repair or replace it (at Honeywell’s option).
If the product is defective,
- return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
- call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885 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 Honeywell that the defect or malfunction was caused by damage that occurred while the product was in the possession of a consumer.
Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL 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 HONEYWELL 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 ONE-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 Honeywell
Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-
468-1502.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
yourhome.honeywell.com
® U.S. Registered Trademark.
© 2015 Honeywell International Inc.
33-00141ES—03 M.S. Rev. 08-15
Printed in U.S.A.
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