About your new thermostat

Congratulations on the purchase of your new Honeywell thermostat. It has been designed to give you many years of reliable service and easy-to-use, push-button climate control.

Features
  • 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

Quick reference to controls

Quick reference to controls
  • On: Fan runs continuously.
  • Auto: Fan runs only when heating or cooling system is on.
  • Cool: Cooling system control.
  • Off: All systems off.
  •  Heat: Heating system control.
  • Em Heat: Emergency & Auxiliary Heat control. Compressor is locked out.

Quick reference to display screen

Quick reference to display screen
  • Cool On: Cooling system is on.
  • Heat On: Heating system is on.
  • Em: Emergency heat is on.
  • Aux: Auxiliary heat is on.

System switch

System switch

The SYSTEM switch can be set to control your heating or cooling system, depending on the season.

  • Cool: Cooling system control.
  • Off: All systems are off.
  • Heat: Heating system control.
  • Em Heat: Emergency & Auxiliary Heat control. Compressor is locked out.

 CAUTION: EQUIPMENT DAMAGE HAZARD. Do not operate cooling system when outdoor temperature is below 50°F (10°C).

Fan switch

Fan switch
  • Set the FAN switch to Auto or On.
  • In “Auto” mode (the most commonly used setting), the fan runs only when the heating or cooling system is on.
  • If set to “On,” the fan runs continuously.

Temperature controls

Temperature controls

Press the temperature adjustment buttons until the temperature you want is displayed in the upper right portion of the screen.

Note: Make sure the SYSTEM switch is set to the system you want to control (Heat or Cool).

Built-in compressor protection

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 for a few 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

Battery replacement
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.

In case of difficulty

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 (see page 9).

Heating or cooling system does not respond

  • Set system switch to Heat (see page 5). Make sure the temperature is set higher than the Inside temperature.
  • Set system switch to Cool (see page 5). Make sure the temperature is set lower than the Inside temperature.
  • Check circuit breaker and reset if necessary.
  • Make sure power switch at heating & cooling system is on.
  • Make sure furnace door is closed securely.
  • 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 (see page 8).

Heat On” is not displayed

  • Set the System switch to Heat, and set the temperature level above the current room temperature (see page 7).

“Cool On” is not displayed

  • Set the System switch to Cool, and set the temperature level below the current room temperature (see page 7).

Customer assistance

For assistance with this product, please visit http://DIYthermostats.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.

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.

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,

  1. return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
  2.  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 which 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. In Canada, write Retail Products ON15-02H, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V4Z9.

Automation and Control Solutions

Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
http://DIYthermostats.honeywell.com

Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9

 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers.

Honeywell Logo

Documents / Resources

Honeywell RTH3100C Heat Pump Non-Programmable Digital Thermostat [pdf] User Manual
RTH3100C, Heat Pump Non-Programmable Digital Thermostat

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