Honeywell RTH2310 Programmable Thermostat

Installation is Easy

Your new thermostat has been designed for fast and easy installation. Follow the simple step-by-step instructions below.

1. Identify your system type.
2. Remove your old thermostat.
3. Identify the wires.
4. Mount the new wallplate.
5. Connect the wires.
6. Address wire label mismatches.
7. Specify the furnace type.
8. Install the batteries.
9. Install the thermostat.
10. Set up the system.

Need assistance? We are here to help. Call 1-800-468-1502.

1. 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

If you are unsure of your system type or have other questions, call toll-free at 1-800-468-1502.

Note: This thermostat is not compatible with heat pumps or multi-stage systems.

2. Remove Old Thermostat

1. Turn power off at the heating/cooling system. ?
2. Remove the old thermostat, but leave the wallplate with wires attached.

Diagram shows the thermostat body being detached from the wallplate, revealing wires connected to terminals Y, G, C, R. The wallplate remains attached to the wall.

MERCURY NOTICE: Do not put 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.

3. Identify Wires

If any wires are not attached to your old thermostat or are attached to a terminal marked C or C1, they will not be connected to your new thermostat. Wrap the bare metal end of each of these unused wires with electrical tape to prevent them from touching and shorting other wires.

Do not use non-connected wires.

Do not use C or C1 wires.

Identify and label each wire.

IGNORE WIRE COLORS: Use terminal screw designations to identify wires.

Diagram shows wires labeled Y, W, R, C. Another diagram shows wires labeled Y, W, G, Rc, R. Arrows indicate wrapping unused wires with tape.

Disconnect wires and remove the old wallplate only after all wires are labeled. Wrap the wires around a pencil to prevent them from falling through the wall opening.

4. Mount New Wallplate

1. Remove coverplate.
2. Loosen the captive screw (the screw remains attached to the wallplate).
3. Remove the thermostat body from the wallplate.
4. Mark and drill appropriate mounting holes (or use existing holes). Insert plastic anchors. Pass wires through the opening of the wallplate and secure the wallplate to the wall using the provided screws.

Diagrams illustrate removing the coverplate, loosening the screw, removing the thermostat, and mounting the wallplate with wires passing through.

5. Connect Wires (Typical Wiring)

Remove the jumper if you have both R and Rc wires.

Diagram shows wires connected to terminals Rh, Rc, W, Y, G on the thermostat base.

1. Match each labeled wire with the terminal having the same letter.
2. Loosen the terminal screws using a screwdriver, insert the wires, then tighten the screws.
3. Push any excess wire back into the wall opening.

Labels don't match? If a wire does not match any terminal on the thermostat, see the next page.

6. Connect Wires (Less Common Wiring)

If a labeled wire does not match any terminal designation, refer to the diagram below.

Diagram shows terminal designations C, R, Rc, W, Y, G with associated labels X, RH, R, W1, Y1, F, B, 4, V, H, M. Arrows indicate connections.

⚠️ Do not use C, X, or B wires. Wrap the bare end of the wire with electrical tape.

⚠️ If wires are connected to both Rh and Rc terminals, remove the jumper (refer to the previous page).

7. Specify Furnace Type

Set the Jumper J2, located on the back of the thermostat, if you have connected a wire to the G terminal.

Diagram indicates the location of the J2 jumper on the back of the thermostat.

• HG: Leave the jumper in this factory-set position if you have a gas or oil furnace.
• HE: Place the jumper to this position if you have an electric furnace.

8. Install Batteries

1. Pull out the battery cover.
2. Install the batteries as shown, observing the polarity.
3. Reinstall the battery cover. You will hear a clicking sound.

After the batteries are installed, the thermostat performs a series of tests for approximately 5 seconds. The screen then displays the actual temperature. It is normal for the displayed temperature to be higher than the ambient temperature if you are holding the thermostat. The thermostat will display the ambient temperature once it is installed on the wall. By default, the setpoint is 70 °F (21 °C).

Diagram shows how to open the battery compartment and install AA batteries.

9. Install Thermostat

1. Mount the thermostat onto the wallplate.
2. Tighten the screw and install the coverplate.
3. Turn power back on at the heating/cooling system. ✅

Diagrams show attaching the thermostat to the wallplate, securing it with the screw, and installing the coverplate.

10. System Setup

1. Press both [Enter] and [Mode] buttons simultaneously for 3 seconds to enter or exit the setup menu.
2. To advance to the next function, briefly press both [Enter] and [Mode] buttons simultaneously.
3. To change the setting, press the [Up Arrow] or [Down Arrow] button.

1 Default settings are shown in bold and underlined.

2 See page 3 of Operating Manual.

3 Use the system switch to switch between the two parameters.

4 For optimal heating control, use the setting that matches your system as follows: 2=30 min (steam, gravity), 3=20 min (hot water, 90%+ high-efficiency furnace), 4=15 min (gas or oil), 5=12 min (alternate setting for gas or oil), 6=10 min (electric).

5 The corresponding cooling cycle lengths are as follows: 2=30 min, 3=20 min, 4=15 min, 5=12 min, 6=10 min.