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TROUBLESHOOTING GUIDE
IF… THEN…
Display will not come on.
■
Check that heat or cool system power is on. If you use batteries,
replace with fresh ones.
■
Make sure thermostat is correctly mounted on base.
Display flashes during programming.
■
You have reached the temperature setting limit. The setting range is
7° C to 31° C. In models with automatic heat-cool changeover, the
COOL temperature setting must be at least 2° C above the HEAT
temperature setting.
Display flashes during operation.
■
Programming has been lost because of a power outage. You must
reprogram.
Program is lost due to power outage.
■
Check that backup batteries are installed correctly. Replace if
necessary. Reprogram the thermostat.
Temperature change occurs
■
Check the program times for the period in question.
at the wrong times. Be sure that AM and PM indications are correct. Make sure the
current day and time are correct. Reprogram if necessary.
■
If using Programmed Recovery, remember that the furnace or air
conditioner comes on before the WAKE and RETURN start times so
the house will be at the desired temperature when the period starts.
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