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Operating  
Manual  
RTH6300B  
Programmable Thermostat  
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Quick Reference Card  
Grasp and pull to see basic  
operating instructions at a  
glance.  
Battery Holder  
Press down and pull to  
remove batteries.  
Batteries should be  
replaced once a year  
(see page 15).  
Need Help?  
For assistance with this product please visit www.honeywell.com/yourhome  
or call Honeywell Customer Care toll-free at 1-800-468-1502  
Read and save these instructions  
®
U.S. Registered Trademark. Patents pending.  
Copyright © 2005 Honeywell International Inc. All rights reserved.  
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RTH6300B Programmable Thermostat  
Table of contents  
About your new thermostat  
Appendices  
Thermostat features ........................2  
Programming at a glance ................3  
Quick reference to controls............4  
Quick reference to display..............5  
Battery installation ........................15  
In case of difficulty ......................16  
Customer assistance......................18  
Accessories/replacement parts ....18  
Limited 1-year warranty ................19  
Programming & Operation  
Set time and day..............................6  
Select fan setting (auto/on) ............7  
Select system setting (heat/cool)......8  
Using program schedules................9  
Program schedule overrides ........12  
Built-in compressor protection ....14  
This thermostat is ready to go!  
Your new thermostat is pre-  
programmed and ready to go.  
See page 3 to check settings.  
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Operating Manual  
About your new thermostat  
Congratulations on the purchase of your new Honeywell thermostat. It has been  
designed to give you many years of reliable service and easy-to-use, push-button  
climate control.  
Features  
•
•
•
•
•
•
•
Separately programmable weekday/weekend schedules.  
One-touch temp control overrides program schedule at any time.  
®
EnergyStar compliant to greatly reduce your heating/cooling expenses.  
Large, clear, backlit display is easy to read — even in the dark.  
Displays both room temperature and temperature setting.  
Removable battery holder for fast, easy replacement.  
Built-in compressor protection.  
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RTH6300B Programmable Thermostat  
This thermostat is ready to go!  
Your new thermostat is pre-programmed and ready to go.All you have to do is set  
the time and day.Then check the settings below and change if needed:  
1
2
3
4
Set time and day (required for proper operation)................................See page 6  
Select fan setting (Auto/On): Preset to Auto ......................To change, see page 7  
Select system setting (Heat/Cool): Preset to Heat..............To change, see page 8  
Program schedules: Preset to energy-saving levels  
while you’re at work or asleep (assumes you  
wake at 6 am, leave at 8 am, return at 6 pm  
and go to bed at 10 pm) ..............................................To change, see pages 9-11  
ONE-TOUCH TEMP CONTROL: You can override the program schedule at any time, and  
manually adjust the temperature (see pages 12-13).  
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Operating Manual  
Quick reference to controls  
Digital display (see page 5)  
Battery holder (see page 15)  
Temperature buttons  
Press to adjust temperature  
settings (see page 11-13)  
Hold button  
Press to override programmed  
temperature control (see page 13)  
Function buttons  
Press to select the function displayed just above each button.  
Functions change depending on the task.)  
(
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RTH6300B Programmable Thermostat  
Quick reference to display screen  
Current inside temperature  
Low battery warning  
see page 15)  
Current time/day  
(see page 6)  
(
Temperature setting  
see pages 11-13)  
Inside  
Replace Battery  
Heat  
Setting  
(
°
Current program period  
Wake/Leave/Return/Sleep  
°
5
System status  
7
AM  
5
6:30  
Wed  
7
On when “calling” for  
heating or cooling;  
flashes when waiting for  
compressor restart (see  
page 14)  
(see pages 9-11)  
Wake  
Heat On  
Set clock/day/schedule  
Press to set time, day or  
program schedules (see  
pages 6 & 11)  
Fan  
System  
Heat  
Set Clock/Day/ Auto  
Schedule  
System setting  
(Heat/Cool/Off;  
Function buttons  
see page 8)  
Press the button beneath each function to view or change  
settings (functions change depending on the task)  
Fan setting  
(Auto/On; see page 7)  
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Operating Manual  
Set the time and day  
Press SET CLOCK/DAY/SCHEDULE, then adjust time  
Press the SET CLOCK/DAY/SCHEDULE  
1
2
3
button, then press  
or  
to set  
the clock time.  
4:  
30PM  
Fan System  
Heat  
Press the SET DAY button, then  
press or to select the day  
of the week.  
Press DONE to save & exit.  
Set Clock/Day/ Auto  
Schedule  
Press SET DAY, then select current day  
Note: If the SET CLOCK/DAY/SCHEDULE  
option is not displayed, press DONE or  
RUN SCHEDULE.  
Wed  
Note: If the display flashes Set Clock,  
the thermostat will follow your settings  
for the weekday “Wake” time period until  
you reset the time and day.  
Done  
Set Day  
Set Schedule  
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RTH6300B Programmable Thermostat  
Select the fan setting  
Fan  
System  
Heat  
Press the FAN button to select Auto or On.  
Set Clock/Day/ Auto  
Schedule  
In“Auto”mode (the most commonly used  
setting), the fan runs only when the heating  
or cooling system is on. If set to“On ,” the fan  
runs continuously. Use this setting for  
improved air circulation, or for more  
efficient air cleaning.  
Fan  
On  
System  
Heat  
Set Clock/Day/  
Schedule  
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Select the system setting  
Fan  
System  
Heat  
Press the SYSTEM button to select Heat, Cool  
or Off.  
Set Clock/Day/ Auto  
Schedule  
•
•
•
Heat: Thermostat controls only the  
heating system.  
Cool: Thermostat controls only the  
cooling system.  
Fan  
System  
Set Clock/Day/ Auto  
Cool  
Schedule  
Off: Heating and cooling systems are off.  
CAUTION: EQUIPMENT DAMAGE  
HAZARD. To prevent possible compressor  
damage, do not operate cooling system when  
outdoor temperature is below 50°F (10°C).  
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RTH6300B Programmable Thermostat  
Save money by setting program schedules  
It’s easy to program your system for maximum energy savings.You can program four  
time periods each day, with different settings for weekdays and weekends.  
WAKE  
Set to the time you awaken and the temperature you want  
during the morning, until you leave for the day.  
6
:00 am  
°
7
8
0
LEAVE  
:00 am  
Set to the time you leave home and the temperature you  
want while you are away (usually an energy-saving level).  
°
6
2
RETURN Set to the time you return home and the temperature you  
6:00 pm  
want during the evening, until bedtime.  
°
7
1
0
SLEEP  
0:00 pm  
Set to the time you go to bed and the temperature you want  
overnight (usually an energy-saving level).  
6
2°  
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®
EnergyStar settings for maximum cost savings  
®
This thermostat is pre-set to use EnergyStar program settings.We recommend  
these settings, since they can reduce your heating/cooling expenses by as much as  
33%. (See next page to adjust times and temperatures of each time period.)  
Heat (Mon-Fri) Cool (Mon-Fri) Heat (Sat-Sun) Cool (Sat-Sun)  
Wake  
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0°  
2°  
0°  
62°  
75°  
83°  
75°  
78°  
70°  
75°  
(
6:00 am)  
Leave  
8:00 am)  
°
°
6
62  
83  
(
[
Or cancel period]  
[Or cancel period]  
Return  
6:00 pm)  
°
°
7
70  
75  
(
[
Or cancel period]  
[Or cancel period]  
Sleep  
10:00 pm)  
62°  
78°  
(
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RTH6300B Programmable Thermostat  
To adjust program schedules  
Fan  
System  
1
2
Press SET CLOCK/DAY/SCHEDULE,then SET SCHEDULE.  
Set Clock/Day/  
Auto  
Heat  
Press  
time (Mon-Fri), then press NEXT.  
Press or to set the temperature for  
or  
to set your weekday Wake  
Schedule  
3
4
this time period, then press NEXT.  
Done  
Set time and temperature for the next  
time period (Leave). Repeat steps 2 and 3  
for each weekday time period.  
Set Day  
Set Schedule  
Heat  
Setting  
5
Press NEXT to set weekend time periods  
Set Schedule  
(
Sat-Sun), then press DONE to save & exit.  
°
2
6
AM  
8
:00  
Note: Make sure the thermostat is set to the  
system you want to program (Heat or Cool).  
Leave Mon Tue Wed Thu Fri  
Note: You can press CANCEL PERIOD to eliminate  
unwanted time periods (except Wake).  
Done  
CancelPeriod Next  
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Program schedule override (temporary)  
Press to temporarily adjust temperature  
Press  
or  
to immediately adjust the  
temperature.This will temporarily override  
the temperature setting for the current time  
period.  
Inside  
Temporary Heat  
Setting  
°
°
5
7
AM  
:30  
6
9
6
Fan  
Auto  
Run Schedule  
System  
The new temperature will be maintained  
only until the next programmed time period  
begins (see page 10). For example, if you  
want to turn up the heat early in the  
morning, it will automatically be lowered  
later, when you leave for the day.  
Heat  
Press to cancel temporary setting  
and resume program schedule  
To cancel the temporary setting at any time,  
Note: Make sure the thermostat is set  
to the system you want to control  
press RUN SCHEDULE.  
(heat or cool).  
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RTH6300B Programmable Thermostat  
Program schedule override (permanent)  
Press to permanently adjust temperature  
Press HOLD to permanently adjust the  
temperature.This will override the  
temperature settings for all time periods.  
Inside  
Heat  
Setting  
Hold  
°
°
5
7
6
9
AM  
6
Fan  
Auto  
:30  
The“Hold” feature turns off the program  
schedule and allows you to adjust the  
thermostat manually, as needed.  
Run Schedule  
System  
Heat  
Whatever temperature you set will be  
maintained 24 hours a day, until you  
manually change it, or press RUN SCHEDULE to  
cancel“Hold”and resume the programmed  
schedule.  
Press to cancel “Hold” setting  
and resume program schedule  
Note: Make sure the thermostat is set  
to the system you want to control  
(heat or cool).  
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Built-in compressor protection  
Inside  
Cool  
Setting  
This feature helps prevent damage to the  
compressor in your air conditioning or heat  
pump system.  
°
°
5
7
AM  
:30  
7
5
6
Damage can occur if the compressor is  
re-started too soon after shutdown.This  
feature forces the compressor to wait for a  
few minutes before restarting.  
Cool On  
Fan  
System  
Set Clock/Day/ Auto  
Cool  
Schedule  
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.  
Message flashes until safe  
restart time has elapsed  
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RTH6300B Programmable Thermostat  
Battery replacement  
Press down and pull to remove  
Install fresh batteries immediately when the  
REPLACE BATTERY warning begins flashing.The  
warning flashes about two months before the  
batteries are depleted.  
Replace Battery  
Even if the warning does not appear,you  
should replace batteries once a year,or before  
leaving home for more than a month.  
If batteries are inserted within two minutes,  
the time and day will not have to be reset.All  
other settings are permanently stored in  
memory, and do not require battery power.  
Insert fresh AA alkaline  
batteries, then reinstall  
battery holder  
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In case of difficulty  
If you have difficulty with your thermostat, please try the suggestions below. Most  
problems can be corrected quickly and easily.  
Display is blank  
•
Make sure fresh AA alkaline batteries are correctly installed  
see page 15).  
(
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).  
To restore  
Energy Star  
default settings  
Follow these steps to restore Energy Star default settings (see page 10):  
®
1
2
3
Press SET CLOCK/DAY/SCHEDULE.  
Press SET SCHEDULE.  
Press DONE and NEXT at the same time for 4 seconds.  
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RTH6300B Programmable Thermostat  
In case of difficulty  
Heating or  
cooling system  
does not respond  
SYSTEM  
button to set system to Heat. Make sure the temperature  
is set higher than the Inside temperature.  
•
Press  
•
Press SYSTEM button to set system to Cool. Make sure the temperature  
is set lower than the Inside temperature.  
•
•
•
•
Check circuit breaker and reset if necessary.  
Make sure power switch at heating & cooling system is on.  
Make sure furnace door is closed securely.  
Wait 5 minutes for the system to respond.  
“
“
Cool On” or  
Heat On” is  
•
Compressor protection feature is engaged. Wait 5 minutes for the system  
to restart safely, without damage to the compressor (see page 14).  
flashing  
Other problems  
•
If the above measures do not resolve the problem, check the In Case of  
Difficulty section in your thermostat Installation Guide.  
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Customer assistance  
For assistance with this product, please visit  
www.honeywell.com/yourhome. Or call  
Honeywell Customer Care toll-free at  
1-800-468-1502.  
To save time, please remove the battery  
holder and note your model number and  
date code before calling.  
Model number  
Date code  
xxxxxxx  
xxxxxxx  
Accessories/replacement parts  
To order, please call Honeywell Customer  
Care toll-free at 1-800-468-1502.  
Battery holder......................Part No. 50007072-001  
Cover plate assembly ........Part No. 50002883-001  
(Use to cover marks left by old thermostats.)  
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RTH6300B Programmable Thermostat  
Limited 1-year 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 warran-  
ty 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.  
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Limited 1-year warranty  
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 CONSE-  
QUENTIAL 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.  
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RTH6300B Programmable Thermostat  
Limited 1-year warranty  
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. In Canada, write Retail Products ON15-02H, Honeywell Limited/  
Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V4Z9.  
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Automation and Control Solutions  
Honeywell International Inc.  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Scarborough, Ontario M1V 4Z9  
www.honeywell.com/yourhome  
®
U.S. Registered Trademark. Patents pending.  
Copyright © 2005 Honeywell International Inc. All rights reserved.  
Printed in U.S. Document number 69-1723. Date 01-2005.