Honeywell RTH6400 User 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.
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