Honeywell RTH2300B1038/E1 User manual

Owner’s Manual
Read and save these
instructions.
For help please visit
honeywellhome.com
RTH2300/RTH221
Series
Programmable
Thermostat
M37777
Heat Off Cool Auto On
Fan
Heat Off Cool Auto On
Fan
Set
Hold
Run
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.
Visit http://honeywellhome.com/support 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
NE
PAS JETER
LE MERCURE
Hg
RTHXXXX
M32707
Customer assistance
For assistance with this product, please visit
http://honeywellhome.com/support
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
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.
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
W
Not
Used
UP
Heat Off Cool Auto On
Fan
M33784A
Heat Off Cool Auto On
Fan
Heat O Cool
Auto On
Fan
Set
Hold
Run
M31544
or
Circuit breaker box Heating/cooling system
power switch
Turn the power back on to
the heating/cooling system.

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.
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
1On: 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” flashes on screen.
About your new thermostat
Your new 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 time
(see page 11)
Current day
(RTH2300 only)
(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. (RTH2300 only)
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. The RTH2300 can be
programmed with different schedules 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 (RTH2300
only).
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
M38262
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
Not
Used
UP
Heat Off Cool Auto On
Fan
M33784A
Heat Off Cool Auto On
Fan
Heat O Cool
Auto On
Fan
Set
Hold
Run
Electrical Ratings
Terminal Voltage (50/60Hz) Max. Current Rating
B20-30 Vac 1.0 A
O20-30 Vac 1.0 A
G20-30 Vac 1.0 A
Y20-30 Vac 1.0 A
W20-30 Vac 1.0 A
R20-30 Vac 1.0 A
Rc 20-30 Vac 1.0 A

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
• 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://honeywellhome.com/support

17
1-year limited warranty
http://honeywellhome.com/support

33-00102EF-05
Resideo Technologies Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
http://honeywellhome.com/support
33-00102EF—05 M.S. Rev. 08-20 | Printed in United States
www.resideo.com
© 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. Tous droits réservés. La marque de commerce Honeywell Home est utilisée avec l’autorisation d’Honeywell International, Inc.
Ce produit est fabriqué par Resideo Technologies, Inc. et ses sociétés affiliées.

M37777
Heat Off Cool Auto On
Fan
Heat Off Cool Auto On
Fan
Set
Hold
Run
RTH2300/RTH221
Série
Veuillez lire le mode
d’emploi et le conserver en
lieu sûr.
Pour obtenir de l’aide veuillez
visiter honeywellhome.com
Manuel du
propriétaire
Thermostat
programmable
Identifier le type de système
Ce thermostat est compatible avec les systèmes suivants:
• À gaz, mazout ou électrique
• Climatiseur central
• Système à eau chaude avec ou sans pompe
• Système millivolts
• Système de chauffage-refroidissement central
• Pompe thermique sans chauffage auxiliaire/de secours
Besoin d’aide? Nous sommes à votre service
Veuillez consulter le site http://honeywellhome.com/support pour obtenir de l’aide au
raccordement avant de retourner le thermostat au magasin.
Ce thermostat ne peut pas être utilisé sur les pompes thermiques avec
chauffage auxiliaire ou les systèmes à plusieurs étages.

2
AVIS : Pour éviter d’endommager le compresseur, ne faites pas
fonctionner le climatiseur si la température extérieure est inférieure à
10 °C (50 °F).
ATTENTION : AVIS RELATIF AU RECYCLAGE
DU MERCURE
Ce produit ne contient aucun mercure.
Cependant, ce produit peut remplacer un produit
qui contient du mercure. Le mercure et les
produits contenant du mercure ne doivent pas
être jetés aux ordures ménagères.
Pour obtenir plus d›informations pour savoir
comment et où recycler adéquatement un
thermostat contenant du mercure aux États-
Unis, consultez l›organisme de recyclage des
thermostats (Thermostat Recycling Corporation)
à www.thermostat-recycle.org.
Pour le recyclage de thermostats contenant
du mercure au Canada, consultez l›organisme
Switch the Stat à www.switchthestat.ca
NO MERCUR
Y
NE
PAS JETER
LE MERCURE
Hg
RTHXXXX
M32707
Services à la clientèle
Pour obtenir de l’aide avec ce produit, veuillez
consulter le site
http://honeywellhome.com/support
Pour gagner du temps, veuillez prendre en note le
numéro de modèle et de code de date du thermostat
avant d’appeler.
Retourner le thermostat pour trouver le
numéro de modèle et le code de date.