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Repair Parts List
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model
number listed on the unit rating plate. Example: G26Q3-75.
CABINET PARTS
Cabinet cap
Blower panel
Upper access panel
CONTROL PANEL PARTS
Surelight
t
integrated control
Transformer
Circuit breaker
Door interlock switch
BLOWER PARTS
Blower wheel
Motor
Motor mounting frame
Motor capacitor
Blower housing cutĆoff plate
Blower housing
HEATING PARTS
Heat exchanger/coil assembly
Gas manifold
Main burner orifices
Main burners
Gas valve
Ignitor
Primary limit control
Flame rollout switch
Filter and filter rack assembly
Flue transition
Pressure switch
Flame sensor
Sight glass and grommet
Rubber boot trap
Foam manifold gaskets
Combustion air inducer
Condensate pipe plug and adapter
Cold end header (collector) box
Troubleshooting
DIAGNOSTIC CODES
LED #1
LED #2
DESCRIPTION
SLOW FLASH
SLOW FLASH
SIMULTANEOUS
SLOW FLASH
SLOW FLASH
FAST FLASH
ON
ON
OFF
ON
OFF
ON
SLOW FLASH
SLOW FLASH
SLOW FLASH
FAST FLASH
Primary or secondary limit switch open.
Rollout switch open. OR: 9Ćpin connector improperly attached.
Flame sensed without gas valve energized.
Pressure switch open or has opened 5 times during a single call for heat;
OR: Blocked inlet/exhaust vent; OR: Condensate line blocked;
OR: Pressure switch closed prior to activation of combustion air inducer.
Power on -- Normal operation.
Also signaled during cooling and continuous fan.
Main power polarity reversed. Switch line and neutral.
Low flame signal. Measures below .7 microAmps. Replace flame sense rod.
Circuit board failure or control wired incorrectly.
Watchguard -- burners failed to ignite.
SIMULTANEOUS
SLOW FLASH
SIMULTANEOUS
FAST FLASH
SIMULTANEOUS
FAST FLASH
Normal operation - signaled when heating demand initiated at
thermostat.
ALTERNATING
SLOW FLASH
ALTERNATING
SLOW FLASH
ON
OFF
OFF
ON
ALTERNATING
FAST FLASH
ALTERNATING
FAST FLASH
Improper main ground or line voltage below 75 volts;
OR: Broken ignitor; OR: Open ignitor circuit.
NOTE - Slow flash equals 1 Hz (one flash per second). Fast flash equals 3 Hz (three flashes per second).
Minimum flame sense current = 0.15 microAmps.
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