Honeywell RTH6400 - Manual (Page 22)

Operating Manual
69-22ES—0 20
In case of difficulty
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 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. Press SET CLOCK/DAY/SCHEDULE.
2. Press SET SCHEDULE.
3. Press DONE and NEXT at the same time for 4 seconds.