Troubleshooting: Cooling Sequence Of Operation - Lennox ML180DF045P24A Unit Information

Troubleshooting: Cooling Sequence of Operation

NORMAL COOLING MODE
IGNITION CONTROL MAIN POWER ON. LED: ON STEADY
CONTROL SELF DIAGNOSTIC CHECK.
IS CONTROL OPERATING NORMALLY?
IS THERE A PROPER GROUND?
IS POLARITY CORRECT?
ABOVE 90 VOLTS?
LED: ON STEADY.
REMAINS UNCHANGED THROUGHOUT COOLING CYCLE.
THERMOSTAT CALLS FOR COOLING.
COMPRESSOR CONTACTOR AND SYSTEM FAN
ENERGIZED WITH 2‐SECOND DELAY
(COOLING SPEED). EAC TERM. ENERGIZED.
THERMOSTAT OPENS.
COMPRESSOR OFF.
SYSTEM FAN AND EAC TERM. OFF
WITH 60‐SECOND DELAY.
COOLING SEQUENCE OF OPERATION
POWER ON
YES
YES
YES
NO
IS VOLTAGE
YES
ABNORMAL COOLING MODE
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
NO
INDOOR BLOWER OFF WITH NORMAL DELAY.
INTERRUPT MAIN POWER TO RESET CONTROL.
NO
LED: ON STEADY
CONTROL WILL CONTINUE TO CALL FOR COOLING
IN THIS CONDITION.
LED: 9 FLASHES
NO
CONTROL WILL CONTINUE TO CALL FOR COOLING
IN THIS CONDITION.
LED: ON STEADY.
CONTROL WILL CONTINUE TO CALL FOR
COOLING IN THIS CONDITION.
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LED: OFF