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Troubleshooting
(continued)
IF… THEN…
Display does not come on. • There is no power being supplied to the thermostat. Check fuse
or circuit breaker.
• Check the furnace air filter. A dirty filter will choke the airflow
causing safety shutdown; replace or clean, if necessary.
Temperature display does
not go lower than 45°F or
higher than 88°F during
programming.
• You have reached the thermostat setting limit. The setting
range is 45°F to 88°F.
Temperature change
occurs at the wrong time.
• Check programming for the period in question. Be sure the
time—including AM/PM indication—is correct. Reprogram if
necessary.
• Keep in mind that it takes time for the system to recover.
Refer to the Recovery from Setback section for details.