61 69-1611
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.