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