Troubleshooting - Honeywell T8411R Manual

TROUBLESHOOTING

SYMPTOM
HEATING OR COOLING EQUIPMENT
WON'T 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.
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 OR
FIRST STAGE HEATING.
INCORRECT WIRING.
HEATING OR COOLING EQUIPMENT
INOPERATIVE.
INOPERATIVE THERMOSTAT.
STILL IN INSTALLER SETUP MODE.
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.
9
T8411R ELECTRONIC HEAT PUMP THERMOSTAT
ACTION
• CHECK THAT C TERMINAL IS CONNECTED TO
THE SYSTEM TRANSFORMER.
• 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.
REPLACE THERMOSTAT.
SEE THE SETTINGS AND ADJUSTMENTS SECTION FOR
INSTRUCTIONS ON INSTALLER SETUP MODE.
• CHECK THAT C TERMINAL IS CONNECTED TO
THE SYSTEM TRANSFORMER.
• 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 SETTINGS
AND ADJUSTMENTS 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.
OR KEYS.
M10291B
68-0185—2