Lennox G43UF SERIES Unit Information

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CONTINUOUS FAN SEQUENCE OF OPERATION
SureLight Control Board 32M88
LED: SLOW FLASH RATE REMAINS
UNCHANGED THROUGHOUT SEQUENCE.
MANUAL FAN SELECTION MADE AT THERMOSTAT.
CONTROL (G) ENERGIZES SYSTEM FAN ON HEATING
SPEED. ELECTRONIC AIR CLEANER ENERGIZED.
THERMOSTAT CALLS FOR HEAT (W).
THERMOSTAT CALLS FOR COOLING.
THERMOSTAT OPENS.
SYSTEM FAN SWITCHED TO COOLING SPEED.
ELECTRONIC AIR CLEANER REMAINS ON.
THERMOSTAT OPENS.
MANUAL FAN SELECTION MADE AT THERMOSTAT.
CONTROL (G) ENERGIZES SYSTEM FAN AT HEATING
SPEED. ELECTRONIC AIR CLEANER ENERGIZED.
NO
YES
YES
NO
HUMIDIFIER ENERGIZES
WITH COMB. AIR INDUCER.
SYSTEM FAN REMAINS ON
HEATING SPEED.
SYSTEM FAN REMAINS ON
HEATING SPEED. ELECTRONIC AIR
CLEANER REMAINS ON.
HUMIDIFIER DE−ENERGIZES
WITH COMB. AIR INDUCER

Lennox G43UF SERIES Specifications

General

Heating Stages	Single-stage
Blower Motor	PSC
Gas Valve	Single-stage
Fuel Type	Natural gas or propane
Cabinet Type	Upflow/Horizontal
Cabinet Width	17.5 inches
Warranty	5-Year Limited Warranty on covered components
Heating Capacity	44, 000 to 132, 000 BTU/h