This manual covers the following models:
CAUTION: EQUIPMENT DAMAGE HAZARD
To prevent possible compressor damage, do not operate the cooling system when the outdoor temperature is below 50°F (10°C).
Need Help?
For assistance with this product please visit Honeywellhome.com/support Read before installing. ® U.S. Registered Trademark. Patents pending. Copyright © 2020 Resideo Technologies Inc. All rights reserved.
Your new Resideo thermostat has been designed to give you many years of reliable service and easy-to-use, push-button climate control.
A quick reference to the display screen
Cool on: The cooling system is on.
Heat on: The heating system is on.
Aux On: Auxiliary heat is on. (Only for heat pumps with this capability [select models only].) When “Heat On” or “Cool On” is flashing, compressor protection is engaged (see page 8).
The SYSTEM switch can be set to control your heating or cooling system, depending on the season.
CAUTION: EQUIPMENT DAMAGE HAZARD. To prevent possible compressor damage, do not operate the cooling system when the outdoor temperature is below 50°F (10°C).
Select the fan setting
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.
Adjust the temperature
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 if you have a heat pump model). When the safe wait time has elapsed, the message stops flashing and the compressor turns on.
Install two fresh AAA batteries when Lo Batt flashes on the screen. Lo Batt appears for 60 days before the batteries are depleted.
Replace batteries once a year, or when you will be away for more than a month. The settings are stored in non-volatile (permanent) memory and are thus pre-served when the thermostat is without batteries.
Customer Assistance
For assistance with this product, please visit Honeywellhome.com/support.To save time, please note your model number and date code before calling.
If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.
Display is blank | • Check the circuit breaker and reset if necessary. • Make sure the power switch at the heating & cooling system is on. • Make sure the furnace door is closed securely. • Make sure fresh AAA alkaline batteries are correctly installed (see page 9). |
The heating or cooling system does not respond | • Set the system switch to Heat (see page 5). Make sure the temperature is set higher than the Inside temperature. • Set the system switch to Cool (see page 5). 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). |
“Heat On” or “Cool 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 5). |
“Cool On” is not displayed | • Set the System switch to Cool, and set the temperature level below the current room temperature (see page 5). |
For warranty information go to Honeywellhome.com/support
CAUTION: MERCURY NOTICE.
If this product is replacing a control that contains mercury in a sealed tube, do not place the old control in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal.
CAUTION: ELECTRONIC WASTE NOTICE.
The product should not be disposed of with other household waste. Check for the nearest authorized collection centers or authorized recyclers. The correct disposal of end-of-life equipment will help prevent negative consequences for the environment and human health.
FCC statement at
https://customer.resideo.com/en-US/support/residential/codes-and-standards/FCC15105/Pages/default.aspx
2020 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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