Lennox ELITE Series Installation Instructions Manual page 52

Troubleshooting: Cooling Sequence of Operation
NORMAL COOLING MODE
IGNITION CONTROL MAIN POWER ON.
CONTROL SELF DIAGNOSTIC CHECK.
IS CONTROL OPERATING NORMALLY?
IS THERE A PROPER GROUND?
ROLLOUT SWITCH MONITORED CONTINUOUSLY.
IS ROLLOUT SWITCH CLOSED?
LED: SLOW FLASH RATE REMAINS UNCHANGED
THROUGHOUT COOLING CYCLE.
THERMOSTAT CALLS FOR COOLING.
COMPRESSOR CONTACTOR AND SYSTEM FAN
ENERGIZED WITH 2-SECOND DELAY
(COOLING SPEED). EAC TERM. ENERGIZED.
SYSTEM FAN AND EAC TERM. OFF
Downloaded from ManualsNet.com
COOLING SEQUENCE OF OPERATION
POWER ON
YES
YES
IS POLARITY CORRECT?
YES
IS VOLTAGE
ABOVE 70 VOLTS?
YES
YES
THERMOSTAT OPENS.
COMPRESSOR OFF.
WITH 45-SECOND DELAY.
search engine
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.
NO
LED FLASHES CODE 2 IMPROPER GROUND
CONTROL WILL CONTINUE TO CALL FOR COOLING
NO
LED FLASHES CODE 1 POLARITY REVERSED
CONTROL WILL CONTINUE TO CALL FOR COOLING IN
NO
LED FLASHES CODE 13 LOW VOLTAGE. CONTROL
WILL CONTINUE TO CALL FOR COOLING
LED FLASHES CODE 8 ROLLOUT SWITCH OPEN. GAS
NO
VALVE OFF. COMBUSTION AIR INDUCER ON. INDOOR
BLOWER ON. SEQUENCE HOLDS UNTIL ROLLOUT SWITCH
CLOSES AND MAIN POWER IS INTERRUPTED OR
THERMOSTAT IS CYCLED OFF/ON FOR 1 SEC. MINIMUM.
Page 52
IN THIS CONDITION.
THIS CONDITION.
IN THIS CONDITION.