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Troubleshooting: Continuous Fan Sequence of Operation
CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION
MANUAL FAN SELECTION MADE AT THERMOSTAT.
AFTER 2 SECOND DELAY, INDOOR BLOWER IS
ENERGIZED ON CONTINUOUS FAN SPEED.
THERMOSTAT CALLS FOR FIRST−STAGE HEAT.THERMOSTAT CALLS FOR FIRST STAGE COOL.
YES
YES
AFTER 45−SECOND DELAY, INDOOR BLOWER
SWITCHES TO LOW HEAT SPEED.
FIRST−STAGE HEAT DEMAND SATISFIED.
YES
NO
THERMOSTAT CALLS FOR SECOND−STAGE HEAT.
YES
INDOOR BLOWER SWITCHES TO HIGH HEAT SPEED
AFTER 30−SECOND RECOGNITION PERIOD.
SECOND−STAGE HEAT DEMAND SATISFIED.
YES
YES
INDOOR BLOWER RAMPS DOWN TO LOW
HEAT SPEED.
INDOOR BLOWER RAMPS TO FIRST STAGE
COOLING SPEED AFTER A 2−SECOND DELAY.
FIRST−STAGE COOL DEMAND SATISFIED?
YES
NO
SECOND STAGE COOL DEMAND SATISFIED?
INDOOR BLOWER RAMPS TO SECOND
STAGE COOL SPEED
YES
SECOND STAGE COOL DEMAND
INDOOR BLOWER RAMPS DOWN TO FIRST STAGE
COOL SPEED.
YES YES
Repair Parts List
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model
number listed on the CSA nameplate −− Example: G61MP−36B−045−1. All service must be performed by a licensed pro-
fessional installer (or equivalent), service agency, or gas supplier.
Cabinet Parts
Upper access panel
Blower access panel
Top Cap
Control Panel Parts
Transformer
Two−stage integrated control board
Door interlock switch
Circuit Breaker
Blower Parts
Blower wheel
Motor
Motor mounting frame
Motor capacitor
Blower housing cutoff plate
Heating Parts
Flame Sensor
Heat exchanger assembly
Gas manifold
Combustion air inducer
Gas valve
Main burner cluster
Main burner orifices
Pressure switches
Ignitor
Primary limit control
Secondary limit control
Flame rollout switches
Combustion air inducer auxiliary limit