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Operating Manual
18
69-2053EFS—03
In case of difficulty
If you have difficulty with your thermostat, please try the suggestions below. Most
problems can be corrected quickly and easily.
Check circuit breaker and reset if necessary.•
Make sure power switch at heating & cooling system is on.•
Make sure furnace door is closed securely.•
To adjust the screen display, see backlight options in the Preferences menu (see •
page 16).
At 2 am each day, Prestige HD models change screen colors for an hour, to prevent •
burn-in. Touch the screen at any time to restore normal screen colors.
Make sure the thermostat is not locked (see page 14).•
Make sure heating and cooling temperatures are set to acceptable ranges:
Heat: 40° to 90°F (4.5° to 32°C).•
Cool: 60° to 99°F (15.5° to 37°C).•
Screen is blank
Screen is difficult
to read
No response to
key presses (or
temperature will
not change)
20


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