Honeywell TH8320ZW User Manual
Page 20
18
69-2485EFS—05
ENGLISH
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
No response to
key presses (or
temperature will
not change)
• Check to make sure the thermostat is not locked (see page 17).
• 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)
Backlight is dim
• If thermostat is AC powered, a dim display is normal. The backlight
remains on at a low level, and brightens when a key is pressed.
Thermostat shows
the calendar
screen (year, date,
& month) when the
power is restored
• This indicates that the coin cell battery has drained out. Replace the
coin cell battery immediately.
In case of difficulty