Honeywell RTH2510 Programmable Thermostat

Read and save these instructions.
For help please visit honeywellhome.com

Identify System Type

This thermostat is compatible with the following systems:

  • Gas, oil or electric furnace
  • Central air conditioner
  • Hot water system with or without pump
  • Millivolt system
  • Central heating and cooling system
  • Heat pump without auxiliary/backup heat
  • Heat pump with auxiliary/backup heat
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-oflife 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

NOTICE: To avoid possible compressor damage, do not run air conditioner if the outside temperature drops below 50°F (10°C).

Customer Asistance

For assistance with this product, please visit honeywellhome.com.
Or call Resideo Customer Care toll-free at 1-800-468-1502.
To save time, please note your model number and date code before calling.
Pull at bottom to remove thermostat from wallplate.

Installation

Turn Off Power to Heating/Cooling System

Remove Old Thermostat

Remove old thermostat but leave wallplate with wires attached

If you have an older thermostat with a sealed mercury tube, turn to page2 for proper disposal instructions.

Label Wires with Tags

Label the wires using the supplied wire labels as you disconnect them

Separate Wallplate from New Thermostat

Remove wallplate from the new thermostat and mount onto 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

Simply match wire labels.

If labels do not match letters on the thermostat, check “Alternate Wiring (Conventional Systems)” on page 6 and connect to terminal as shown (see notes, below).

Maximum load: 1 A @ 24 Vac, 50/60HZ per output.
We are here to help. Call 1-800-468-1502 for wiring assistance

Alternate Wiring (Conventional Systems)

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.

Do not use C or X. Wrap bare end of wire with electrical tape.

If you have a heat pump without auxiliary/backup heat connect O or B, not both

Altrnate Wiring (Heat Pump)
If labels do not match letters on thermostat, see page 7

Alternate wiring (for heat pumps with auxiliary or backup heat 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.

Do not use C or X wire. Do not use B wire if you already have O wire. Wrap
bare end of wire with electrical tape

Do not use L wire. Wrap bare end of wire with electrical tape

If your old thermostat had E and Aux wires (or alternate wires), connect both
wires to Aux terminal.

Install Batteries

Set Fan Operation Switch

Move the switch to the proper setting:

Gas or Oil: For gas or oil heating systems, leave the fan operation switch in this factory-set position (for systems that control the fan in a call for heat).

Electric or Heat Pump: Change the switch to this setting for heat pump or electric heat systems. (This setting is for systems that allow the thermostat to control the fan in a call for heat, if a fan wire is connected to the G terminal.)

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.

If Your System Type is…

If your system type is:

  • Single Stage Heat and Cool
  • Heat Only or Cool Only

Congratulations, you’re done!

If your system type is:

  • Heat Pump* with Backup Heat

Continue with Advanced Installation 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 multistage conventional systems.

Advanced Installation

Enter System Setup

To enter system setup, press and hold both the ▲ and ▼ buttons until the display changes (approximately 5 seconds).

Changing Settings

  1. Press the ▲or ▼button to change the setting.
  2. Press the ▲ and▼ buttons simultaneously for one second to advance to the next function.
  3. Press the RUN button to exit and save settings.

NOTE: If you do not press any button for 60 seconds while you are in the setup menu, the thermostat automatically saves any changes made and exits the menu

Function Description
Press the ▲ or ▲button to
Setting 
1 select system type Heating & cooling: Gas, oil or electric heating with central air conditioning or heat pump without auxiliary/ back-up heat.
Heat pump with auxiliary/backup heat: Outside compressor provides both heating and cooling.
5 select your heating system and optimize its operation Gas or oil furnace: Use this setting if you have a standard gas or oil furnace that is less than 90% efficient.
Electric furnace: Use this setting if you have any type of electric heating system.
3 Heat pump, 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. 2 Gas/oil steam or gravity system: Use this setting if you have a steam or gravity heat system.
13 select Early Start 1 On
0 Off
14 select Fahrenheit or Celsius temperature display Fahrenheit temperature display (°F)
Celsius temperature display (°C)
15* select Compressor Protection settings 1 On
0 Off
20 select clock display 12-hour display
24-hour display
21 select Change Filter Timer Off                            3  6 months

30 days                     4  9 months

90 days                     5 1 year

40 restore program schedule to default settings Off
On: Program schedule default settings are listed on page 12.

* Compressor Protection: This feature forces the compressor to wait approximately 5 minutes
before restarting, to prevent equipment damage. During the wait time, the message “Cool On” or
“Heat On” is displayed on screen

About Your New Thermostat

Your new Resideo thermostat has been designed to give you many years of reliable service and easy-to-use, push-button climate control.

  • Backlit display is easy to read
  • Displays ambient (measured) temperature at all times
  • One-touch access to setpoint temperature
  • Preset program settings
  • Temporary and permanent override of schedule
  • Early start ensures the right temperature at the right time
  • Built-in compressor protection

Thermostat Controls

Display Screen

Set the Time and Day

  1. Press the SET button, then press ▲or ▼to set the clock time.
  2. Press the SET button, then press ▲or ▼to select the day of the week.
  3. Press RUN to save & exit.

NOTE: If the clock flashes, the thermostat will follow your settings for the Monday “Wake” time period until you reset the time and day.

Program Schedule

You can program four time periods each day, with different settings for weekdays and weekends. We recommend the pre-set settings (shown in the table below), since they can reduce your heating/cooling expenses

Wake – Set to the time you awaken and the temperature you want during the morning, until you leave for the day.

Leave – Set to the time you leave home and the temperature you want while you are away (usually an energysaving level).

Return – Set to the time you return home and the temperature you want during the evening, until bedtime.

Sleep – Set to the time you go to bed and the temperature you want overnight (usually an energy-saving level).

NOTE: Leave and Return periods can be canceled on weekends.

To Adjust Program Schedules (RTH2510)

  1. Press SET until Set Schedule is displayed.
  2. Press ▲ or ▼to set your Wake time for the day displayed, then press SET.
  3. Press ▲ or ▼to set the temperature for this time period, then press SET.
  4. Set time and temperature for the next time period (Leave). Repeat steps 2 and 3 for each day’s time period.
  5. Press RUN to save & exit.

NOTE: Make sure the thermostat is set to the system you want to program (Heat or Cool).

To Adjust Program Schedules (RTH2410)

  1. Press SET until Set Schedule is displayed.
  2. Press ▲ or ▼to set your weekday Wake time (Mo-Fr), then press SET.
  3. Press ▲ or ▼to set the temperature for this time period, then press SET.
  4. Set time and temperature for the next time period (Leave). Repeat steps 2 and 3 for each weekday time period.
  5. Press SET to set weekend time periods (Sa & Su), then press RUN to save & exit.

NOTE: Make sure the thermostat is set to the system you want to program (Heat or Cool).

Program Schedule Override (Temporary)

Press ▲ or ▼to immediately adjust the temperature. This will temporarily override the temperature setting for the current time period “Temporary” will appear on the display and the current program period will flash. The new temperature will be maintained only until the next programmed time period begins (see page 12).

To cancel the temporary setting at any time, press RUN.
Honeywell-RTH2510-Programmable-Thermostat-Display-Setup-Interface 

NOTE: Make sure the thermostat is set to the system you want to control (heat or cool).

Program Schedule Override (Permanent)

Press HOLD to permanently adjust the temperature. This will override the temperature settings for all time periods.
Honeywell-RTH2510-Programmable-Thermostat-Display-Setup-Interface

The “Hold” feature turns off the program schedule and allows you to  adjust the thermostat manually, as needed.
Whatever temperature you set will be maintained 24 hours a day, until you manually change it, or press
RUN to cancel “Hold” and resume the program schedule.
Honeywell-RTH2510-Programmable-Thermostat-Display-Setup-Interface
NOTE: Make sure the thermostat is set to the system you want to control\ (heat or cool).

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.
Honeywell-RTH2510-Programmable-Thermostat-Display-Setup-Interface

Early Start

This feature allows the heating or cooling to turn on before the program start time, so the temperature is reached at the time you set. For example: Set the Wake time to 6 am, and the temperature to 70°. The heat will come on before 6 am, so the temperature is 70° by the time you wake at 6. The next time period is displayed when the system is activated before a scheduled time period.
Honeywell-RTH2510-Programmable-Thermostat-Display-Setup-Interface

Change Filter

If the filter reminder is turned on during installation, the words Change Filter will flash on the screen when the filter needs to be replaced.
After you replace the air filter, press and hold the RUN button for 3 seconds to reset the alert.
Honeywell-RTH2510-Programmable-Thermostat-Display-Setup-Interface

Battery Replacement

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.
Most settings are stored in nonvolatile (permanent) memory. Only the clock and the day must be set after you replace the batteries.
Honeywell-RTH2510-Programmable-Thermostat-Overview

Warning-Icon.png Set the System switch to Off before removing the batteries. Otherwise, the heating/cooling system could remain activated even when batteries are removed.

Honeywell-RTH2510-Programmable-Thermostat-Overview

Troubleshooting

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 AAA alkaline batteries are correctly installed.
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 honeywellhome.com or call Resideo Customer Care toll-free at 1-800-468-1502.

1-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 one (1) year 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 which 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 RESIDEO 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 Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.

Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
33-00110EF—05 M.S. Rev. 10-21 | Printed in United States

©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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Documents / Resources

Honeywell RTH2510 Programmable Thermostat [pdf] Owner's Manual
RTH2510, RTH2410, Programmable Thermostat

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