Honeywell Rth2300b1012a Manual

69-2326EF-01
RTH23005+2 Programmable Thermostat
Operating
Manual 

Read and save these instructions.
CAUTION: EQUIPMENT DAMAGE HAZARD
To prevent possible compressor damage, do not use Cooling mode when the
outdoor temperature is below 50°F (10°C).
Need Help?
For assistance with this product please visit http://yourhome.honeywell.comor call Honeywell 
Customer Care toll-free at 1-800-468-1502. 

Programmable Thermostat RTH2300
OverviewThermostat features ..............................2
Quick start .............................................3
Quick reference to controls ...................4
Quick reference to display .....................5Programming & OperationSetting the clock ....................................6
System switch (Heat/Cool) ....................7
Fan switch (Auto/On).............................8
Using the schedule ...........................9-11
Temporary schedule override...

Operating Manual
69-2326EF—012Your new thermostat has been designed to give you many years of reliable service and
easy-to-use, push-button climate control.Features• Backlit display is easy to read
• Displays ambient (measured) temperature at all times
• One-touch access to setpoint temperature
• Separate programmable weekday/weekend schedules (5+2 day programming)
• Temporary and permanent override of schedule
• Built-in compressor protectionAbout your new thermostat 

Programmable Thermostat RTH2300
369-2326EF—01
Simply perform the three steps below and the thermostat is in operation:
Set the clock ................................................................................................ See page 6

Select whether to heat or cool...................................................................... See page 7

Select whether to run the fan continuously or only when needed ................ See page 8
Your thermostat is preset to energy-saving levels. If you do...

Operating Manual
69-2326EF—014Quick reference to controls
System switch (see page 7)
•Cool: System is in Cooling mode.
•Off: System is off.
•Heat: System is in Heating mode.
Fan switch (see page 8)
•On: Fan runs continuously.
•Auto: Fan runs only when 
heating or cooling is activated. Up/Down buttons 
Press to adjust temperature. Screen
Lit for 12 seconds when
you press any button.
Press to set clock, day or 
schedule (see pages 6 & 11).
Press to override schedule and 
hold temperature (see page 13)....

Programmable Thermostat RTH2300
569-2326EF—01
Quick reference to display* When Heat On or Cool On is flashing, compressor protection is engaged (see page 14).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 is activated. *
• Heat On: Heating is activated. *Low-battery warning 
(see page 15) Setpoint indicator
Appears when the...

Operating Manual
69-2326EF—016
Press the Set button. Set Time will appear on the screen and the 
time display will flash.

Press the Up or Down button to set the time.

Press the Set button again. Set Day will flash on the screen.

Press the Up or Down button to select the day of the week.

Press the Run button to save the changes & exit. (The changes 
are also saved if you do not press any button for 60 seconds.)
NOTE: The clock has lost its settings when the time display flashes. If the thermostat...

Programmable Thermostat RTH2300
769-2326EF—01
System switch (Heat/Cool)
Use the System switch to place the system in
one of the following modes:
•Cool: System is in Cooling mode.
•Off: System is off.
•Heat: System is in Heating mode.
CAUTION: EQUIPMENT DAMAGE HAZARD. 
Do not use Cooling mode when the outdoor temperature is below 50°F (10°C). 

Operating Manual
69-2326EF—018Fan switch (Auto/On)
Use the Fan switch to select the fan operation.
•Auto: The fan runs only when heating or 
cooling is activated (commonly used setting).
•On: The fan runs continuously.