In Case Of Difficulty - Honeywell Zuba-Central TH9000 Series Operating Manual

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
No response to
key presses (or
temperature will
not change)
Backlight is dim
"Err" appears
on screen
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
• Check to make sure the thermostat is not locked (see page 26).
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)
• A dim display is normal. See Advanced function 0280 on page 22 for
backlight options.
• Contact your contractor. Your equipment may need service or repair.
27
TH9000 Series
69-2404EFS—01