Troubleshooting - Honeywell T8024D Product Data

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