Lennox EL280UHX Series Unit Information page 46

POWER ON
IS POLARITY REVERSED?
NO
IS THERE
PROPER GROUND?
THERMOSTAT CALLS FOR FIRST-STAGE COOL.
COMPRESSOR AND CONDENSER FAN
ENERGIZED.
INDOOR BLOWER ENERGIZED ON FIRST STAGE
COOL SPEED AFTER 2 SECOND DELAY.
FIRST-STAGE DEMAND FOR COOL SATISFIED?
NO
THERMOSTAT CALLS FOR SECOND-STAGE COOL.
INDOOR BLOWER RAMPS UP TO SECOND-STAGE COOL SPEED.
SECOND-STAGE DEMAND FOR COOL SATISFIED?
YES
UNIT RETURNS TO FIRST STAGE COOL
COOLING SEQUENCE OF OPERATION
YES
NO
YES
YES
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SIGNAL POLARITY REVERSED.
CONTROL WILL CONTINUE TO CALL FOR COOLING
IN THIS CONDITION.
STATUS ERROR CODE 5 + 4.
SIGNAL IMPROPER GROUND AT LED.
CONTROL WILL CONTINUE TO CALL FOR COOLING
IN THIS CONDITION.
STATUS ERROR CODE 5 + 3.
COMPRESSOR AND CONDENSER FAN DE-ENERGIZED.
INDOOR BLOWER DE-ENEGIZED.