Honeywell Home RCT8102A Programmable Thermostat
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
- It is preset for the most common system
We are here to help. Call 1-800-468-1502 for wiring assistance before returning the thermostat to the store.
Turn Off Power to Heating/Cooling System
Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
MERCURY NOTICE: Do not place your old thermostat in the trash if it contains mercury in a sealed tube. Contact your local waste management authority for instructions regarding recycling and proper disposal.
Label the wires using the supplied wire labels as you disconnect them.
NOTE: Jumper wire used on old thermostat? If yes, note what letters the jumper connected and review in wiring section.
Separate Wallplate from New Thermostat
Insert Quick Reference Card
Insert quick reference card into slot in back of thermostat.
Mount Wallplate
Mount the new wallplate using the included screws and anchors.
- Drill 3/32-in. holes for plaster.
- Drill 3/16-in. holes for drywall.
- Use hammer to tap the anchors into the wall.
Connect Wires
Simply match wire labels.
Labels don’t match? See page 23.
Have a Heat Pump system? See pages 24-25. We are here to help.
Call 1-800-468-1502 for wiring assistance.
Install Batteries
Install Thermostat onto Wallplate
Install thermostat onto the wallplate on the wall.
Turn Power Back On
Turn the power back on to the heating/cooling system.
11 If your system type is…
If your system type is:
Single Stage Heat and Cool
Congratulations, you’re done!
If your system type is:
- Multistage Heat and Cool
- Heat Pump* without Backup Heat
- Heat Pump* with Backup Heat
- Heat Only
- Cool Only
Continue with advanced installation on page 13 to match your thermostat to your system type.
Heat Pump—an air conditioner that provides cooling in the summer, and also runs in reverse in the winter to provide heating. - If you are not sure of your system type or if you have other questions, call us toll-free at 1-800-468-1502.
- This thermostat works on 24 volt or 750 mV systems.
- It will NOT work on multi-stage heat pump systems or 120/240 Volt systems.
System Setup
Press and hold the
and FAN buttons until the screen changes (approximately 5 seconds).
Advanced Installation
Function 1: System type
Press the 
button to select the type of system you have in your home:
- Heat pump: Outside compressor provides both heating and cooling without backup or auxiliary heat.
- Heating only: Gas, oil or electric heating without central air conditioning.
- Heating only with fan: Gas, oil or electric heating without central air conditioning. (Use this setting if you could turn the fan on and off with a fan switch on your old thermostat.)
- Cool only: Central air conditioning only.
- Heat Pump: Outside compressor provides both heating and cooling with backup or auxiliary heating.
- Heat/Cool Multiple Stages: Two heat stages (wires on W and W2), two cooling stages (wires on Y and Y2).
- Heat/Cool Multiple Stages: Two heat stages (wires on W and W2), one cooling stage (wire on Y).
- Heat/Cool Multiple Stages: One heat stage (wire on W), two cooling stages (wires on Y and Y2).
Function 2: Heat pump changeover valve
Press thebutton to select whether your changeover valve is used in heating or cooling:
NOTE: If Function 2 does not appear, please turn to the next page to continue.
- Heating changeover valve: Use this setting if you connected a wire labeled “B” to the O/B wire terminal (see page 21).
Function 3: Heating fan control
Press the button to select your heating system and fan operation:
NOTE: If Function 3 does not appear, please turn to the next page to continue.
- Electric heat: Use this setting if you have an electric heating system (thermostat controls fan operation).
Function 5: Heating cycle rate
Press the button to select your heating system and optimize its operation:
NOTE: If Function 5 does not appear, please turn to the next page to continue.
- 9 Electric furnace: Use this setting if you have any type of electric heating system.
- 3 Hot water or high-efficiency furnace: Use this setting if you have a hot water system or a gas furnace of greater than 90% efficiency.
- 1 Gas/oil steam or gravity system: Use this setting if you have a steam or gravity heat system.
Function 6: Stage 2 Heat cycle rate
Press the button to select your heating system and optimize its operation:
NOTE: If Function 6 does not appear, please turn to the next page to continue.
- 9 Electric furnace: Use this setting if you have any type of electric heating system.
- 3 Hot water or high-efficiency furnace: Use this setting if you have a hot water system or a gas furnace of greater than 90% efficiency.
- 1 Gas/oil steam or gravity system: Use this setting if you have a steam or gravity heat system.
Function 8: Emergency Heat cycle rate
Press thebutton to select your heating system and optimize its operation:
NOTE: If Function 8 does not appear, please turn to the next page to continue.
- 9 Electric furnace: Use this setting if you have any type of electric heating system.
- 1 Gas/oil steam or gravity system: Use this setting if you have a steam or gravity heat system.
- 3 Hot water or high-efficiency furnace: Use this setting if you have a hot water system or a gas furnace of greater than 90% efficiency.
- 5 Gas or oil furnace: Use this setting if you have a standard gas or oil furnace that is less than 90% efficient.
Function 12: Manual/Auto Changeover
Press the button to select Manual or Auto Changeover:
NOTE: If Function 12 does not appear, please turn to the next page to continue.
- 1 Automatic Changeover: (Heat/Off/Cool/Auto) Automatically turns on heat or cool based on room temperatures.
CAUTION: To avoid possible compressor damage, set to option 0 if the outside temperature drops below 50 ºF (10 ºC).
NOTE: System maintains a minimum 3 ºF difference between heat and cool settings.
Function 13: Smart Response® Technology
Press the button to select Smart Response® Technology:
NOTE: See Operating Manual for information on Smart Response® Technology.
Function 14: Smart Response® Technology
Press the button to select Fahrenheit or Celsius temperature display:
1 Celsius temperature display (°C)
Congratulations, you’re done!
Wiring—Conventional System
If labels do not match letters on the thermostat, check the chart below and connect to terminal as shown here (see notes, below).
- If wires will be connected to both R and Rc terminals, remove metal jumper (see page 6).
- Do not use C, X or B. Wrap bare end of wire with electrical tape.
Wiring- heat pump
Connect wires: Heat Pump
- Match each labeled wire with same letter on new thermostat.
- Use a screwdriver to loosen screws, insert wires into hole under screw, then tighten screws until wire is secure.
- If E and Aux do not each have a wire connected, use a small piece of wire to connect them to each other.
- Push any excess wire back into the wall opening.
Labels don’t match? See page 26.
Wiring complete, return to Step 8.
Alternate wiring (for heat pumps only)
If labels do not match letters on the thermostat, check the chart below and connect to terminal as shown here (see notes, below).
- Leave metal jumper in place, connecting R & Rc terminals.
- If your old thermostat had both V and VR wires, stop now and contact a qualified contractor for help.
- If your old thermostat had separate O and B wires, wrap the B wire in electrical tape and do not connect.
- If your old thermostat had Y1, W1 and W2 wires, stop now and contact a qualified contractor for help.
- If E and Aux terminals do not each have a wire connected, use a small piece of wire to connect them to each other.
Wiring complete, return to Step 8.
Trouble Shooting
If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.
- Display is blank: Make sure fresh AA alkaline batteries are correctly installed (see page 7).
- 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).
- Cannot change system setting to Cool: Check Function 1: System Type to make sure it is set to match your heating and cooling equipment (see page 14).
- Fan does not turn on when heat is required: Check Function 3: Heating Fan Control to make sure it is set to match your heating equipment (see page 16).
- Heating and cooling equipment running at the same time (or heat does not turn off):
- Check Function 1: System Type to make sure it is set to match your heating and cooling equipment (see page 14).
- Grasp and pull thermostat away from wallplate. Check to make sure bare wires are not touching each other (see page 6).
- Heating or cooling system does not respond:
- Press SYSTEM button to set system to Heat. Make sure the temperature is set higher than the Inside temperature.
- Press SYSTEM button to set system to Cool. 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.
- “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 pump issues cool air in heat mode, or warm air in cool mode: Changeover Valve to make sure it is properly configured for your system (see page 15).
- Heating system is running in cool mode: make sure it is set to match your heating and cooling equipment (see page 14).
Customer assistance
For assistance with this product, please visit https://www.honeywellhome.com/us/en/support/
or call Honeywell Customer Care toll-free at 1-800-468-1502.
To save time, please remove the battery holder and 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.
- Battery holder ………………………… Part No. 50007072-001
- Cover plate assembly* ……………. 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,
- 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 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 exclu-sion 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 war-ranty 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.
MERCURY NOTICE: Do not place your old thermostat in the trash if it contains mercury
in a sealed tube. Contact your local waste management authority for instructions regarding recycling and proper disposal.
CAUTION: To avoid possible compressor damage, do not run air conditioner if the outside temperature drops below 50 °F (10 °C).
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
https://www.honeywellhome.com/us/en/support/
® U.S. Registered Trademark
© 2011 Honeywell International Inc.
69-2637ES—01 M.S. 05-11
Printed in U.S.A.
Reference
Honeywell Home RCT8102A Programmable Thermosta Quick Installation Guide
Honeywell Home RCT8102A Programmable Thermostat Quick Installation Guide