Honeywell T8665C Owner's Manual - Page 48

Installer did not activate this, displayed or is - air filters

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Table 3. Troubleshooting. (Continued) Symptom Possible Cause Action Room temperature is cooler than current setting and air conditioner is still running. Thermostat is operating in Pre-cool mode. If the thermostat displays PrE, wait until the Pre-cool event is complete. To cancel, press and hold Run Program for three seconds until DONE is displayed. If PrE does not display, contact your local heating contractor or Energy Utility. Outdoor temperature is not displayed or is incorrect. Installer did not activate this option. Outdoor sensor is connected incorrectly. Filter expired. Contact installer or service technician. Press i key twice for outdoor temperature when filter expiration shows on display. Refer to the Filter Indicator section. 69-1538 48

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69-1538
48
Room temperature
is cooler than
current setting and
air conditioner is
still running.
Thermostat is operating in
Pre-cool mode. If the
thermostat displays PrE,
wait until the Pre-cool event
is complete.
To cancel, press and hold
Run Program for three
seconds until DONE is
displayed.
If
PrE does not display, contact your local
heating contractor or Energy Utility.
Outdoor
temperature is not
displayed or is
incorrect.
Installer did not activate this
option.
Outdoor sensor is connected
incorrectly.
Filter expired.
Contact installer or service technician.
Press
i
key twice for outdoor temperature
when filter expiration shows on display.
Refer to the Filter Indicator section.
Table 3. Troubleshooting. (Continued)
Symptom
Possible Cause
Action