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T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS
68-0195–2
2
SYMPTOM POSSIBLE CAUSE ACTION
HEATING OR COOLING EQUIPMENT
WON'T OPERATE.
NO AC POWER TO THERMOSTAT.
• CHECK THAT C TERMINAL IS CONNECTED TO
THE SYSTEM TRANSFORMER (T8001 ONLY).
• CHECK POWER TO HEATING AND COOLING EQUIPMENT
– ON/OFF SWITCH
– FUSE OR CIRCUIT BREAKER
– LOOSE 24V CONNECTION
AT THERMOSTAT
AT FURNACE/AIR CONDITIONER
– INCORRECT WIRING (SEE WIRING DIAGRAM)
THERMOSTAT INOPERATIVE. CONDUCT SELF-TEST; SEE CHECKOUT SECTION.
PRESENT SETTING TOO LOW/HIGH. ADJUST TEMPERATURE BY PRESSING OR KEYS.
SYSTEM SWITCH ON THERMOSTAT
IN WRONG POSITION.
RESET THERMOSTAT SYSTEM SWITCH.
MINIMUM/OFF-TIMES IN THERMOSTAT
IN OPERATION ON COOLING.
WAIT FIVE MINUTES OR FOLLOW STEPS IN
CHECKOUT SECTION.
MINIMUM/OFF-TIMES IN THERMOSTAT
IN OPERATION ON COOLING.
WAIT FIVE MINUTES OR FOLLOW STEPS IN
CHECKOUT SECTION.
INCORRECT WIRING.
CHECK WIRING DIAGRAM.
CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS.
HEATING OR COOLING EQUIPMENT
INOPERATIVE.
REPLACE THERMOSTAT.
PARTIAL DISPLAY
IS FLASHING AND COOLING WILL
NOT OPERATE
INOPERATIVE THERMOSTAT.
SEE THE INSTALLER SETUP SECTION FOR INSTRUCTIONS.
STILL IN INSTALLER SETUP MODE.
RECONFIGURE THE DISPLAY. SEE INSTALLER SETUP
SECTION.
TEMPERATURE DISPLAY IS
INCORRECT.
THERMOSTAT IS CONFIGURED FOR
°F OR °C DISPLAY.
• CHECK THAT C TERMINAL IS CONNECTED TO
THE SYSTEM TRANSFORMER (T8001 ONLY).
• CHECK POWER TO HEATING AND COOLING EQUIPMENT
– ON/OFF SWITCH
– FUSE OR CIRCUIT BREAKER
– LOOSE 24V CONNECTION
AT THERMOSTAT
AT FURNACE/AIR CONDITIONER
– INCORRECT WIRING (SEE WIRING DIAGRAM)
NO DISPLAY
NO POWER TO THERMOSTAT.
SEE INSTALLATION INSTRUCTIONS FOR
CORRECT MOUNTING.
CHECK THE TEMPERATURE SETPOINTS; TEMPERATURE
SETTING RANGE IS 40°F (4°C) TO 99°F (37°C).
THE UPPER OR LOWER
TEMPERATURE LIMITS WERE
REACHED.
THERMOSTAT MOUNTED
INCORRECTLY ON WALLPLATE.
CHECK WIRING DIAGRAM.
FAN DOES NOT OPERATE PROPERLY
IN HEAT OR COOL MODES.
INCORRECT WIRING.
CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS.
HEATING OR COOLING EQUIPMENT
INOPERATIVE.
TEMPERATURE SETTINGS WILL NOT
CHANGE. (EX: CANNOT SET THE
HEATING HIGHER OR THE
COOLING LOWER).
M11733
TROUBLESHOOTING T8000/T8001
Home and Building Control
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9
Home and Building Control
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
www.honeywell.com/yourhome68-0195–2 G.H. Rev. 10-01