Honeywell T8635L User Manual page 44

Troubleshooting (Cont)
Symptom
Outdoor temperature
not displayed or is
incorrect.
"no com" is displayed.
is flashing and there is
no air coming from the
register.
Heat or cool turns on
before programmed
time.
Possible Cause
Installer did not activate this
option.
Outdoor sensor is connected
incorrectly.
Filter expired.
The thermostat is unable to
communicate with the
equipment interface module
located at the furnace.
When using the thermostat in
zoning applications, the
thermostat must wait for all
other zones to end their call for
heat or cool before the fan
request in this zone is honored.
Adaptive Intelligent
Recovery™ control is on.
Contact installer or service technician.
Press key twice for outdoor temperature when filter ex-
piration shows on display.Refer to the Filter Indicator section.
Turn the power off and then on to your furnace. If the problem
persists, call your local heating and air conditioning dealer for
assistance.
Wait until all other zone heat or cool cycles are complete.
Adaptive Intelligent Recovery™ control brings the heat or cool
on early to meet the temperature set for the programmed
period. See Adaptive Intelligent Recovery™ control section.
To disable Adaptive Intelligent Recovery™ control, contact
your l ocal Heating and Air Conditioning contractor.
44
Action
69-1332—3