Goodman Mfg GAS-FIRED WARM AIR FURNACE, MH95/ACSH96/AMEH96/ GCH95/GME95/GCH9 Continuously

TROUBLESHOOTING CHART

Symptoms of	Associated		Fault	Possible Causes	Corrective Action	Cautions
Abnormal Operation	LED Code2		Description(s)			& Notes
• Circulator blower runs			• Primary limit	• Insufficient conditioned air	• Check primary limit.	• Turn power OFF
continuously. No furnace		4	circuit is open.	over the heat exchanger.	Replace if necessary.	prior to repair.
operation.				Blocked filters, restrictive	• Check filters and	• Replace primary
• Integrated control module		4 FLASHES		ductwork, improper	ductwork for blockage.	switch with proper
diagnostic LED is flashing				circulator blower speed, or	Clean filters or remove	replacement part.
FOUR (4) flashes.				failed circulator blower.	obstruction.	• Replace blower
				• Faulty primary limit switch.	• Check circulator blower
						with correct
				• Loose or improperly	speed and performance.	replacement part.
				connected wiring.	Correct speed or replace
					blower if necessary.
					• Tighten or correct wiring
					connection.
• Induced draft blower and			• Flame sensed	• Short to ground in flame	• Correct short at flame	• Turn power OFF
circulator blower runs		5	with no call for	sense circuit.	sensor or in flame	prior to repair.
continuously. No furnace			heat.		sensor wiring.
operation.
	5 FLASHES
• Integrated control module
diagnostic LED is flashing
FIVE (5) flashes.
• Furnace fails to operate.			• Rollout limit open.	• Flame rollout.	• Check burners for proper	• See “Vent/Flue
• Integrated control module		6	• Integrated control	• Misaligned burners,	alignment.	Pipe” section for
diagnostic LED is flashing			module fuse is	blocked flue and/or air	• Check flue and air inlet	piping details.
SIX (6) flashes.	6 FLASHES		blown.	inlet pipe, or failed	piping for blockage,	• Replace induced
					proper length, elbows,
• No furnace operation.				induced draft blower.		draft blower with
					and termination. Correct
				• Loose or improperly		proper replace-
					as necessary.
				connected wiring.	• Check rollout limit. Replace	ment part.
				• Short in 24 volt AC	if necessary.	• Replace inte-
				control circuits or safety	• Check induced draft	grated control
				circuits.	blower for proper	module fuse with
				•Faulty rollout limit.	performance. Replace, if	3A automotive
					necessary.	fuse.
					• Tighten or correct wiring	• Read precautions
					connection.	in “Electrostatic
					• Repair short in 24 volt AC
						Discharge”
					control/safety circuit(s).	section of manual.
					• Replace integrated control	• Replace rollout
					module fuse (3A).	limit with correct
						replacement part.
• Normal furnace			• Flame sense	• Flame sensor is coated/	• Sand flame sensor.	• Turn power OFF
operation.		7	microamp signal is	oxidized.	• Inspect for proper sensor	prior to repair.
• Integrated control module			low.	• Flame sensor incorrectly	alignment.	• Clean flame sensor
diagnostic LED is		7 FLASHES		positioned in burner	• Compare current gas	with steel wool.
						• See “Vent/Flue
flashing SEVEN (7)				flame.	pressure to rating plate
						Pipe” section for
flashes.				• Lazy burner flame due to	info. Adjust as needed.
						piping details.
				improper gas pressure or		• See rating plate for
				combustion air.
						proper gas
						pressure.
• Furnace not operating.			• Problem with	• Improperly connected	• Check and correct wiring	• Turn power OFF
• Integrated control module			igniter circuit.	igniter.	from integrated control	prior to repair.
				• Bad igniter.
diagnostic LED is					module to igniter.	• Replace igniter
				• Poor unit ground.
flashing EIGHT (8)					•Replace bad igniter.	with proper
		8 FLASHES		• Poor burner ground.
flashes.					•Check and correct unit	replacement part.
				• Faulty integrated control
				module.	ground wiring.	• Read precautions
					• Replace bad integrated	in “Electrostatic
						Discharge”
					control module.
						section of manual.
• Induced draft blower runs			• Polarity of 115	• Polarity of 115 volt AC	• Review wiring diagram to	• Turn power OFF
continuously. No furnace		C	or 24 volt	power to furnace or	correct polarity.	prior to repair.
operation.			power is	integrated control module	• Verify proper ground.
				is reversed.
			reversed.
• Integrated control module	CONTINUOUS			• Red and blue wires to	Correct if necessary.
diagnostic LED is flashing				transformer are reversed.	• Reverse red and blue
continuously.		FLASHING		• Poor unit ground.	wires connected to
					transformer.
• LED is steady on		STEADY	• Normal operation.
		ON

2LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch.

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