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VisionPRO
®
IAQ
27 69-1815EFS—06
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 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)
Backlight is dim • A dim display is normal. See Advanced function 0280 on page 22 for
backlight options.
“Err” appears
on screen
• Contact your contractor. Your equipment may need service or repair.
In case of difficulty