Troubleshooting Guide - Honeywell Digital Round T8775A Product Data

T8775A,C THE DIGITAL ROUND

TROUBLESHOOTING GUIDE

HEATING OR COOLING EQUIPMENT
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.
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
68-0279 J.S. 4-04
™
NON-PROGRAMMABLE THERMOSTATS
NO AC POWER TO THERMOSTAT.
THERMOSTAT INOPERATIVE.
PRESENT SETTING TOO LOW/HIGH.
SYSTEM SWITCH ON THERMOSTAT
IN WRONG POSITION.
MINIMUM-OFF TIME IN COOLING.
INCORRECT WIRING.
HEATING OR COOLING EQUIPMENT
INOPERATIVE.
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.
CHECK FUEL SWITCH POSITION.
HEATING OR COOLING EQUIPMENT
INOPERATIVE.
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
• 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)
SEE CHECKOUT SECTION.
ADJUST TEMPERATURE BY TURNING DIAL CLOCKWISE OR
COUNTER-CLOCKWISE.
RESET THERMOSTAT SYSTEM SWITCH.
WAIT UP TO FIVE MINUTES FOR THE COOLING EQUIPMENT
TO TURN ON.
CHECK WIRING DIAGRAMS.
CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS.
REPLACE 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 DIAGRAM)
SEE MOUNT THERMOSTAT TO WALLPLATE SECTION.
RECONFIGURE THE DISPLAY. SEE CUSTOMIZE
THERMOSTAT 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.
CHECK WIRING DIAGRAMS.
SEE CUSTOMIZE THERMOSTAT SECTION.
CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS.
www.honeywell.com/yourhome
M19684