Honeywell RTH2300 series User manual

Owner’s Manual
Read and save these
instructions.
For help please visit
yourhome.honeywell.com
RTH2300/RTH221
Series
Programmable
Thermostat
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
Do you need assistance? We are here to help.
Call 1-800-468-1502 for wiring assistance before returning
the thermostat to the store.
This thermostat cannot be used on heat pumps with
backup heat or on multistage systems.

2
NOTICE: To avoid possible compressor damage, do not run air
conditioner if the outside temperature drops below 50°F (10°C).
ATTENTION: MERCURY RECYCLING NOTICE
This product does not contain mercury. However,
this product may replace a product that contains
mercury. Mercury and products containing
mercury should not be discarded in household
trash.
For more information on how and where to
properly recycle a thermostat containing
mercury in the United States, please refer to the
Thermostat Recycling Corporation at
www.thermostat-recycle.org.
For mercury thermostat recycling in Canada,
please refer to Switch the Stat at
www.switchthestat.ca
NO MERCUR
Y
NO BOTE
MERCURIO
Hg
RTHXXXX
M32707
Customer assistance
For assistance with this product, please visit
http://yourhome.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.
Pull at bottom to remove thermostat from
wallplate.
Turn thermostat over to find model number
and date code.

3
Installation
Installation............................................3
Advanced Installation...........................8
About your new thermostat
Controls and Home screen
quick reference...................................10
Preset energy-saving schedules........11
Programming and operation
Setting the clock.................................11
Adjusting program schedules.............12
Overriding schedules temporarily ......13
Overriding schedules permanently ....13
Compressor protection.......................14
Change filter.......................................14
Replace batteries ...............................15
Appendices
Troubleshooting..................................16
Limited warranty.................................17
Table of contents
1 Turn Off Power to Heating/Cooling System
or
M31535
Circuit breaker
box Heating/cooling system power switch

4
Do not remove wallplate yet
3 Label Wires with Tags
Label the wires using the supplied wire labels as you disconnect them.
Wire Labels
M28100
M32731
TO REMOVE WALLPLATE
PULL HERE
Wallplate
C
C
MCR33823
Terminal
designation
If you have an older thermostat with a
sealed mercury tube, turn to page 2
for proper disposal instructions.
Terminal designation
C
C
MCR31537
2 Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
4 Separate Wallplate from New Thermostat
Remove wallplate from the new thermostat and mount onto wall.

5
5 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
6 Connect Wires
Simply match wire labels.
If labels do not match letters on the thermostat, check “Alternate Wiring” on
page 6 and connect to terminal as shown here (see notes, below).
Thermostat does not work on Heat Pumps with auxiliary/backup heat.
We are here to help. Call 1-800-468-1502 for wiring assistance.
W/
Aux
Not
Used
M32714
Remove metal
jumper if you
have both Rand
Rc wires.
M32732
SCREW
INSERT WIRES
AND TIGHTEN
SCREWS
WIRE
HOLE
LABELED
WIRES
W
G
R
Not
Used
W
Y

6
Alternate Wiring
If wires will be connected to both Rand Rc terminals, remove metal
jumper.
Do not use Cor X. Wrap bare end of wire with electrical tape.
If you have a heat pump without auxiliary/backup heat connect Oor B,
not both. If you do not have a heat pump, do not connect B. Wrap bare
end of wire with electrical tape.
Place a jumper (piece of wire) between Yand Wif you are using a heat
pump without auxiliary/backup heat.
B O G Y
WNOT
USED
R Rc
M32734
44
7 Install Batteries
Install two AAA alkaline batteries.
Back of thermostat
RTHXXXX
M32707

7
8 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.)
9 Install Thermostat onto
Wallplate
Install thermostat onto the wallplate on
the wall.
RTHXXXX
M32716
GAS OR OIL
ELECTRIC OR HEAT PUMP
GAS OR OIL
ELECTRIC OR HEAT PUMP
10 Turn Power Back On
Turn the power back on to
the heating/cooling system.
W/
Aux
Not
Used
Heat Off Cool Auto On
Fan
M33784
Heat Off Cool Auto On
Fan
Heat Off Cool
Auto On
Fan
Set
Hold
Run
M31544
or
Circuit breaker box Heating/cooling system
power switch

8
11 If your system type is...
If your system type is:
qSingle Stage Heat and Cool
qHeat Only or Cool Only
Congratulations, you’re done!
If your system type is:
qHeat pump
qHigh efficiency furnace
qHot water
qElectric furnace
qGas/oil steam
qGravity system
Continue with Advanced Installation to match your thermostat to your system
type.
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 conventional systems.
Advanced Installation
Enter System Setup
To enter system setup, press and hold
both the sand tbuttons until the display
changes (approximately 5 seconds).
Changing Settings
1. Press the sor tbutton to change
the setting.
2. Press the sand tbuttons
simultaneously for one second to
advance to the next function.
3. Press the RUN button to exit and save
settings.
M33785
Heat Off Cool Auto On
Fan
Heat Off Cool Auto On
Fan
Set
Hold
Run
Function
Setting
55
M33786
Set
Hold
Run

9
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 sor tbutton to Setting
5 select your heating system and
optimize its operation
5 Gas or oil furnace: Use this setting if you have a standard
gas or oil furnace that is less than 90% efficient.
6 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.
14 select Fahrenheit or Celsius
temperature display
0 Fahrenheit temperature display (°F)
1 Celsius temperature display (°C)
15* select Compressor Protection
settings
1 On
0 Off
20 select clock display 012-hour display
124-hour display
21
(RTH2300
only)
select Change Filter Timer 0Off
130 days
290 days
36 months
49 months
51 year
40
(RTH2300
only)
restore program schedule to
default settings
0 Off
1 On: Program schedule default settings are listed on
page11.
* 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 Honeywell thermostat has been designed to give you many years of
reliable service and easy-to-use, push-button climate control.
• Backlit display on RTH2300
• Displays ambient (measured) temperature at all times
• One-touch access to setpoint temperature
• Preset program settings
• Temporary and permanent override of schedule
• Built-in compressor protection

10
Thermostat controls
M33612
Heat Off Cool Auto On
Fan
Heat Off Cool Auto On
Fan
Set
Hold
Run
Set: Press to set
time/day/schedule.
Hold: Press
to override
programmed
temperature
control.
Run: Press to
resume program
schedule.
Temperature
adjustment
Press the up or
down buttons
until you reach
the desired
temperature.
NOTE: Make sure
the SYSTEM switch
is set to the system
you want to control
(Heat or Cool).
Fan Switch is used to control your fan.
In “Auto” mode, the fan runs only when
the heating or cooling system is on.
If set to “On,” the fan runs continuously.
System Switch is used to control
your heating or cooling system.
• Heat: Heating system control.
• Off: All systems off.
• Cool: Cooling system control.
Display screen
M32701
We
Lo
Batt
Wake
Set
am
Heat
75
On
6:30
Low battery warning
(see page 15)
Setpoint indicator
Appears when the setpoint
temperature is displayed.
Temperature
The ambient (measured)
temperature is normally displayed.
To view the setpoint temperature,
press the Up or Down button
once. The setpoint temperature will
appear for five seconds.
System status
Cool on: Cooling system is on.
Heat on: Heating system is on.
When Cool On is flashing, compressor
protection is engaged (see page 14).
Current day/time
(see page 11)
Current program period
Wake/Leave/Return/Sleep
(see pages 11–13)

11
Set
Hold
Run
Set Time
am
6:30
M33787
Set Day
We
Set
Hold
Run
M33788
Set the time and day
1. Press the SET button, then press
sor tto set the clock time.
2. Press the SET button, then press
sor tto 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 energy-saving 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.
Heat Cool
Wake
(6:00 am) 70 °78 °
Leave
(8:00 am) 62 °85 °
Return
(6:00 pm) 70 °78 °
Sleep
(10:00 pm) 62 °82 °

12
To adjust program schedules (RTH2300)
Set
Hold
Run
M33794
Mo Tu We Th Fr
Wake
Set Schedule
Set
am
75
6:30
1. Press SET until Set Schedule is
displayed.
2. Press sor tto set your weekday
Wake time (Mo-Fr), then press
SET.
3. Press sor tto 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).
Set
Hold
Run
M33795
Mo Tu We Th Fr Sa Su
Wake
Set Schedule
Set
am
75
6:30
To adjust program schedules (RTH221)
1. Press SET until Set Schedule is
displayed.
2. Press sor tto set your Wake
time (Mo-Su), then press SET.
3. Press sor tto 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 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).

13
Set
Hold
Run
M3379
6
Temporary
Set
am
70
6:30
Set
am
75
6:30
M33797
Set
Hold
Run
Program schedule override (temporary)
Press sor tto 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 11).
To cancel the temporary setting at any
time, press RUN.
NOTE: Make sure the thermostat is set
to the system you want to control (heat
or cool).
Hold
Set
am
70
6:30
M33798
Set
Hold
Run
Set
am
75
6:30
M33797
Set
Hold
Run
Program schedule override (permanent)
Press HOLD to permanently adjust
the temperature. This will override
the temperature settings for all time
periods.
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.
NOTE: Make sure the thermostat is
set to the system you want to control
(heat or cool).

14
Built-in compressor protection
Change filter (RTH2300 only)
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). When
the safe wait time has elapsed, the
message stops flashing and the
compressor turns on.
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.
We
Wake
am
Cool
75
On
6:30
M32711
Set
am
75
6:30
M33632
Set
Hold
Run
Change Filter – Press & Hold Run to Reset

15
Change filter (RTH2300 only)
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 non-volatile
(permanent) memory. Only the clock
and the day must be set after you
replace the batteries.
Pull at bottom to remove
thermostat from wallplate.
Turn thermostat over,
insert fresh AAA
alkaline batteries, then
reinstall thermostat.
Set the System switch to Off before removing
the batteries. Otherwise, the heating/cooling
system could remain activated even when
batteries are removed.
RTHXXXX
M32707
W/
Aux
Not
Used
Heat Off Cool Auto On
Fan
M33784
Heat Off Cool Auto On
Fan
Heat Off Cool
Auto On
Fan
Set
Hold
Run

16
Troubleshooting
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 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 http://yourhome.honeywell.com or
call Honeywell Customer Care toll-free at 1-800-468-1502.

17
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,
(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 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.

Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
yourhome.honeywell.com
® U.S. Registered Trademark.
© 2015 Honeywell International Inc.
33-00102ES—01 M.S. 07-15
Printed in U.S.A.
33-00102ES-01

RTH2300/RTH221
Series
Lea y guarde estas
instrucciones.
Para obtener ayuda, visite
yourhome.honeywell.com
Manual del
propietario
Termostato
Programable
Identifique el tipo de sistema
Este termostato es compatible con los siguientes sistemas:
• Calefactor a gas, aceite o eléctrico
• Aire acondicionado central
• Sistema a agua caliente con o sin bomba
• Sistema de milivoltios
• Calefacción y aire acondicionado centrales
• Bomba de calor sin calefacción auxiliar
¿Necesita ayuda? ¡Aquí estamos!
Llame al 1-800-468-1502 para obtener asistencia con el
cableado antes de devolver el termostato a la tienda.
Este termostato no puede usarse en bombas de calor
con calefacción auxiliar ni en sistemas multietapas.

2
AVISO: Para evitar posibles daños al compresor, no utilice el aire
acondicionado si la temperatura externa es inferior a 50 °F (10 °C).
ATENCIÓN: AVISO PARA EL RECICLAJE DEL
MERCURIO
Este producto no contiene mercurio. Sin
embargo, este producto puede reemplazar
uno que contenga mercurio. El mercurio y los
productos que contengan mercurio no se deben
desechar con los desperdicios domésticos.
Para más información sobre cómo y dónde
reciclar adecuadamente un termostato que
contenga mercurio en los Estados Unidos,
consulte con Thermostat Recycling Corporation
en www.thermostat-recycle.org.
Para el reciclaje de termostatos con mercurio en
Canadá, consulte con Switch the Stat en
www.switchthestat.ca
NO MERCUR
Y
NO BOTE
MERCURIO
Hg
RTHXXXX
M32707
Asistencia al cliente
Para obtener asistencia relacionada con este
producto, visite http://yourhome.honeywell.com.
O comuníquese con el número gratuito del servicio de
atención al cliente, llamando al 1-800-468-1502.
Para ahorrar tiempo, anote el número de modelo y el
código de fecha antes de llamar.
Gire el termostato para ver el número de
modelo y el código de fecha.