Repair Parts List - Lennox ML195UH Installation Instructions Manual

Troubleshooting: Continuous Fan Sequence of Operation
CONTINUOUS HEAT SPEED FAN SEQUENCE OF OPERATION
THERMOSTAT CALLS FOR COOLING.
SYSTEM FAN SWITCHED TO COOL SPEED.
EAC TERM. REMAINS ON.
THERMOSTAT OPENS.
MANUAL FAN SELECTION MADE AT THERMOSTAT.
CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT

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: ML195UH045XP24B−01. All service must be performed by a licensed
professional installer (or equivalent), service agency, or gas supplier.
Cabinet Parts
Upper access panel
Blower access panel
Top Cap
Control Panel Parts
Transformer
Integrated control board
Door interlock switch
Blower Parts
Blower wheel
Motor
Motor mounting frame
Motor capacitor
Blower housing cutoff plate
LED: SLOW FLASH RATE REMAINS
UNCHANGED THROUGHOUT SEQUENCE.
MANUAL FAN SELECTION MADE AT THERMOSTAT.
CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT
SPEED. EAC TERMINAL IS ENERGIZED.
THERMOSTAT CALLS FOR HEAT (W).
NO
YES
SPEED. EAC TERM. ENERGIZED.
YES
SYSTEM FAN REMAINS ON
NO
HUM TERM. DE−ENERGIZES
SYSTEM FAN REMAINS ON
Heating Parts
Flame Sensor
Heat exchanger assembly
Gas manifold
Combustion air inducer
Gas valve
Main burner cluster
Main burner orifices
Pressure switch
Ignitor
Primary limit control
Flame rollout switches
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HUM TERM. ENERGIZES
WITH COMB. AIR INDUCER.
HEATING SPEED.
THERMOSTAT OPENS.
WITH COMB. AIR INDUCER
HEATING SPEED.