Diagnostic Codes - Lennox G26 series Installation Instructions Manual

The following repair parts are available through Lennox dealers.
number listed on the unit rating plate. Example: G26Q3-75.
CABINET PARTS
Cabinet cap
Blower panel
Upper access panel
CONTROL PANEL PARTS
Surelight" integrated control
Transformer
Circuit breaker
Door interlock switch
BLOWER PARTS
Blower wheel
Motor
Motor mounting frame
Motor capacitor
Blower housing cut-off plate
Blower housing
When ordering parts, include the complete fumace model
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
DIAGNOSTIC CODES
LED #1
SIMULTANEOUS
SLOW FLASH
SIMULTANEOUS
FAST FLASH
SLOW FLASH
OFF
ALTERNATING
SLOW FLASH
SLOW FLASH
ON
ON
ON
OFF
FAST FLASH
SLOW FLASH
ALTERNATING
FAST FLASH
LED #2
SIMULTANEOUS
SLOW FLASH
SIMULTANEOUS
FAST FLASH
ON
SLOW FLASH
ALTERNATING
SLOW FLASH
OFF
SLOW FLASH
ON
OFF
ON
SLOW FLASH
FAST FLASH
ALTERNATING
FAST FLASH
DESCRIPTION
Power on - Normal operation.
Alan _inn_l_d dHrinn t_nnlinn _nd r_nfin=JnH_ fan
Normal operation - signaled when heating demand initiated at
thermostat
Primary or secondary limit switch open.
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.
Watchguard - burners failed to ignite.
Flame sensed without _las valve energized.
Rollout switch open. OR: 9-pin connector improperly attached.
Circuit board failure or control wired incorrectly.
Main power polarity reversed. Switch line and neutral.
Low flame signal. Measures below .7 microAmps. Replace flame sense rod.
Improper main ground or line voltage below 75 volts;
OR: Broken ieniter: OR: Oeen ieniter circuit.
NOTE - Slow flash equals 1 Hz :one flash per second). Fast flash equals 3 Hz (three flashes per second).
Minimum flame sense current = O.15 mieroAmps.
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