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69-1412—1 G.H. Rev. 12-02 www.honeywell.com/yourhome
T8624D CHRONOTHERM
®
IV DELUXE PROGRAMMABLE MULTISTAGE THERMOSTATS
Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
System on indicator
(flame=heat,
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.
Heating or cooling equipment is
not operating.
Verify operation of heating or cooling equipment in self-test.
Outdoor tempera-
ture not displayed
a
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 incorrect
a
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.
a
Select models.
Table 6. Troubleshooting Guide. (Continued)
Symptom Possible Cause Action