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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
■
You have reached the temperature setting limit. The setting range is 45
°
F to 88
°
F.
programming.
Check that the COOL temperature setting is at least 3
°
F above the HEAT
temperature setting.
Display flashes during
■
Programming has been lost because of a power outage. You must reprogram.
operation.
Program is lost due to
■
Check that backup batteries are installed correctly. Replace if necessary.
power outage.
Reprogram the thermostat.
Temperature change occurs
■
Check the program times for the period in question. Be sure that AM and PM
at the wrong times.
indications are correct. Make sure the current day and time are correct. Repro-
gram if necessary.