Lennox International Inc G32Q3-75, G32Q3-100, G32Q5-125, G32Q5-100 Cabinet, Heat exchanger/coil

The following repair parts are available through independent Lennox dealers. When ordering parts, include the complete furnace model number listed on the unit rating plate. Example: G32Q3-75-1.

CABINET		PARTS			Gas manifold
Cabinet	cap				Combustion				air inducer
Blower	panel				Main	burner			orifices
Upper	access		panel		Main	burners
CONTROL		PANEL		PARTS	Two-stage			gas valve
Two-Stage control board					Ignitor
Surelight TM integrated control board					Primary		limit		control
					Flame		rollout		switch
Transformer
Circuit	breaker				Filter and filter rack assembly
Door interlock			switch		Flue transition
BLOWER		PARTS			Pressure switch					- high heat (-75 only)
Blower	wheel				Pressure switch - low heat
					Flame		sensor
Motor
Motor mounting frame (Q4/5 only)					Sight	glass		and		grommet
					Rubber		boot		trap
Motor capacitor
					Foam	manifold				gaskets
Blower housing cut-off plate
					Two-speed combustion air inducer
Blower	housing
					Condensate pipe plug and adapter
HEATING		PARTS
					Cold end header (collector) box
Heat exchanger/coil				assembly

Make sure to Identify LED'SCorrectly.

Refer to figure 30 for control board layout.

LED #1	LED #2
SIMULTANEOUS	SIMULTANEOUS
SLOW FLASH	SLOWFLASH
SIMULTANEOUS	SIMULTANEOUS
FAST FLASH	FASTFLASH
SLOW FLASH	ON
OFF	SLOW FLASH

DESCRIPTION

Power on - Normal operation.

Also siqnaleddudnq coolin,qand continuousfan

Normal operation- signaledwhen heating demand initiatedat thermostat.

Primary or secondary limit switch open. Limit must close within 3 minutes or unit qqes into 1 hour Watchouard,

Pressure switchopen or has opened 5 times during a single carl for heat; OR: Blocked inlet/exhaust vent;

OR: Pressure switchclosed prior to activationof combustion air inducer.

ALTERNATING	ALTERNATING
SLOW FLASH	SLOW FLASH
SLOW FLASH	OFF
ON	SLOW FLASH
ON	ON
ON	OFF
OFF	ON

Watchguard - burners failed to ignite;OR limit open more than 3 minutes; OR lost flame sense 5 times in one heating cycle;

OR pressure switch opened 5 times in one heatino cvcle.

Flame sensed withoutgas valve energized. Rollout switchopen.

Cimuit board failure or controlwired incorrectly.Check 24 and 115 volts to

board.

FAST FLASH	SLOW FLASH	Main power polarity reversed. Switch line and neutral.
SLOW FLASH	FAST FLASH	Low flame signal. Measures below .7 micmAmps. Replace flame sense rod.
		The followingconditionsare sensed during the ignitorwarm-up period only:
		1) Improper main ground;
ALTERNATING	ALTERNATING	2)	Broken ignitor;OR: Open ignitorcircuit;
FASTFLASH	FASTFLASH	3)	Line voltage be{ow 75 volts.

(If voltage towerthan 75 volts pdor to ignitor warm-up,control will signal waiting on call from thermostat, and will not respond.

NOTE - Slow flash equals 1 Hz (one flash per second). Fast flash equals 3 Hz (three flashes per second). Dropout flame

sense current = 0.15 to 0.17 microAmps.

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