T8602C CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS
Table 6. Troubleshooting Guide. (Continued)
Symptom Possible Cause Action
System on indicator
(flame=heat,
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.
Fan operation set for 0 (con
ventional heat) when it should
be set for 1 (electric heat).
Enter Installer Setup number 2 and reconfigure the fan
operation.
Conventional heating equipment
turns on the fan when the
furnace has
warmed up to a setpoint.
Wait a minute after seeing the on indicator and then check the
registers.
Heating or cooling equipment is
not operating.
Verify operation of heating or cooling equipment in self-test.
Outdoor
temperature is not
displayeda
Option not activated. Enter Installer Setup number 24 and set to 1.
Thermostat must have OT terminals and a C7089B1000
installed.
Outdoor
temperature display
is incorrecta
Outdoor sensor is connected
incorrectly.
Refer to C7089B1000 Installation Instructions and check wiring
between the thermostat and sensor.
Wrong sensor. Replace sensor with C7089B1000 Sensor.
Thermostat
backlight appears
dim.
Backlight can fade over the life
of the batteries.
• Wait until Replace Battery indicator is illuminated and replace
batteries.
• Replace batteries now.
a Select models.
Honeywell
Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
69-1509—2 GH. Rev. 12-02
®
Printed In U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
www.honeywell.com/yourhome
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