Lennox G32V Series Service Literature page 60

NORMAL COOLING MODE
IGNITION CONTROL MAIN POWER ON.
CONTROL SELF DIAGNOSTIC CHECK.
IS CONTROL OPERATING NORMALLY?
TURN INDUCER ON FOR 1 SECOND.
IS POLARITY REVERSED?
SIGNAL IMPROPER
GROUND AT LED.
NO
SIGNAL HOLDS
PROPER GROUND?
UNTIL UNIT IS
PROPERLY
GROUNDED.
ROLLOUT SWITCH MONITORED CONTINUOUSLY.
IS ROLLOUT SWITCH CLOSED?
CHECK FOR MAIN BURNER FLAME SENSE.
IS MAIN BURNER FLAME OFF?
LED: SLOW FLASH RATE REMAINS UNCHANGED
THROUGHOUT COOLING CYCLE.
THERMOSTAT CALLS FOR COOLING.
COMPRESSOR CONTACTOR AND BLOWER
ENERGIZED WITH 0-SECOND DELAY
(COOLING SPEED). ACC. TERM. ENERGIZED.
ON/OFF" LED−DS3 LIT. CFM" LED−DS4 BLINKS
ONCE FOR EVERY 100CFM.
THERMOSTAT OPENS.
INDOOR BLOWER AND ACC. TERM. OFF
WITH 0-SECOND DELAY.
COOLING SEQUENCE OF OPERATION
POWER ON
YES
NO
YES
IS THERE
YES
COMPRESSOR OFF.
ABNORMAL COOLING MODE
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
NO
INDOOR BLOWER OFF WITH NORMAL DELAY.
SIGNAL CIRCUIT BOARD FAILURE AT LED.
INTERRUPT MAIN POWER TO RESET CONTROL.
YES
SIGNAL POLARITY REVERSED AT LED.
NO
IS VOLTAGE
ABOVE 75 VOLTS?
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
NO
INDOOR BLOWER OFF WITH NORMAL DELAY.
SIGNAL CIRCUIT BOARD FAILURE AT LED.
SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES.
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
NO
INDOOR BLOWER OFF WITH NORMAL DELAY.
SIGNAL CIRCUIT BOARD FAILURE AT LED.
SEQUENCE HOLDS UNTIL FLAME IS NOT SENSED.
Page 60
LOW VOLTAGE SIGNAL AT LET HOLDS
UNTIL VOLTAGE RISES ABOVE 75 VOLTS.