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Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
68-0279 J.S. 4-04 www.honeywell.com/yourhome
T8775A,C THE DIGITAL ROUND
™
NON-PROGRAMMABLE THERMOSTATS
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
TROUBLESHOOTING GUIDE
HEATING OR COOLING EQUIPMENT
WILL NOT OPERATE.
NO AC POWER TO THERMOSTAT.
• 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 DIAGRAMS)
THERMOSTAT INOPERATIVE.
SEE CHECKOUT SECTION.
PRESENT SETTING TOO LOW/HIGH.
ADJUST TEMPERATURE BY TURNING DIAL CLOCKWISE OR
COUNTER-CLOCKWISE.
SYSTEM SWITCH ON THERMOSTAT
IN WRONG POSITION.
RESET THERMOSTAT SYSTEM SWITCH.
MINIMUM-OFF TIME IN COOLING.
WAIT UP TO FIVE MINUTES FOR THE COOLING EQUIPMENT
TO TURN ON.
INCORRECT WIRING.
CHECK WIRING DIAGRAMS.
CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS.
HEATING OR COOLING EQUIPMENT
INOPERATIVE.
REPLACE THERMOSTAT.
PARTIAL DISPLAY
INOPERATIVE THERMOSTAT.
RECONFIGURE THE DISPLAY. SEE CUSTOMIZE
THERMOSTAT SECTION.
TEMPERATURE DISPLAY IS
INCORRECT.
THERMOSTAT IS CONFIGURED FOR
F OR C DISPLAY.
• 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 MOUNT THERMOSTAT TO WALLPLATE SECTION.
CHECK THE TEMPERATURE SETPOINTS; TEMPERATURE
SETTING RANGE IS 40 F TO 90 F (4.5 C TO 32 C) IN HEATING
AND 45 F TO 99 F (7 C TO 37 C) IN COOLING.
THE UPPER OR LOWER
TEMPERATURE LIMITS WERE
REACHED.
THERMOSTAT MOUNTED
INCORRECTLY ON WALLPLATE.
CHECK WIRING DIAGRAMS.
FAN DOES NOT OPERATE PROPERLY
IN HEAT OR COOL MODES.
INCORRECT WIRING.
SEE CUSTOMIZE THERMOSTAT SECTION.
CHECK FUEL SWITCH POSITION.
CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS.
HEATING OR COOLING EQUIPMENT
INOPERATIVE.
TEMPERATURE SETTINGS WILL NOT
CHANGE. (EX: CANNOT SET THE
HEATING HIGHER OR THE
COOLING LOWER).
M1968
4