Panasonic CU-2S18NBU-1 service manual Troubleshooting Guide, Self Diagnosis Function

14. Troubleshooting Guide

14.1 Self Diagnosis Function

•The display screen of wireless remote control unit and the self-diagnosis LEDs (green) on the outdoor printed circuit board in the outdoor unit can be used to identify the location of the problem.

Refer to the table below to identify and solve the cause of the problem, and then re-start the air conditioner system.

•If the problem is solved and operation returns to normal. LED 1 illuminates and others LED are off.

Diagnosis	Abnormality
	or	LED	LED	LED	LED	LED	LED	Abnormality	Protection	Problem	Check location
display	Protection	6	5	4	3	2	1	Judgment	Operation
	control
									Indoor fan only		• Indoor/outdoor
	Indoor/outdoor							After	operation can	Indoor/outdoor	wire terminal
							○		start by		• Indoor/outdoor
H11	abnormal							operation for		communication
									entering into		PCB
	communication							1 minute	force cooling	not establish	• Indoor/outdoor
									operation		connection wire
										Total indoor	• Indoor/outdoor
										capability more
											connection wire
	Indoor unit									than maximum
								90s after			• Indoor/outdoor
						○				limit or less than
H12	capacity								―		PCB
								power supply		minimum limit, or
	unmatched									number of	• Specification and
											combination table
										indoor unit less
											in catalogue
										than two
	Compressor							Continuous		Compressor	• Compressor
H15	temperature					○	○		―	temperature	temperature
	sensor							for 5s		sensor open or	sensor lead wire
	abnormality									short circuit	and connector
	Outdoor									Current
	current				○		○			transformer	• Outdoor PCB
H16	transformer							―	―	faulty or	faulty or
	(CT)									compressor	compressor faulty
	abnormality									faulty
	Outdoor air							Continuous		Outdoor air	• Outdoor air
H27	temperature				○	○			―	temperature	temperature
	sensor							for 5s		sensor open or	sensor lead wire
	abnormality									short circuit	and connector
	Outdoor heat									Outdoor heat	• Outdoor heat
	exchanger				○	○	○	Continuous		exchanger	exchanger
H28	temperature								―	temperature	temperature
								for 5s
	sensor 1									sensor 1 open or	sensor 1 lead wire
	abnormality									short circuit	and connector
	Outdoor heat									Outdoor heat	• Outdoor heat
	exchanger			○				Continuous		exchanger	exchanger
H32	temperature								―	temperature	temperature
								for 5s
	sensor 2									sensor 2 open or	sensor 2 lead wire
	abnormality									short circuit	and connector
	Indoor/outdoor			○			○			Indoor and	• Indoor and
H33	misconnection							―	―	outdoor rated	outdoor units
	abnormality									voltage different	check
	Outdoor gas								Heating	Outdoor gas pipe	• Outdoor gas pipe
	pipe							Continuous
				○		○				temperature	temperature
H36	temperature								protection
								for 5s		sensor open or	sensor lead wire
	sensor								operation only	short circuit	and connector
	abnormality
	Outdoor liquid									Outdoor liquid	• Outdoor liquid
	pipe							Continuous	Cooling
				○		○	○			pipe temperature	pipe temperature
H37	temperature								protection
								for 5s		sensor open or	sensor lead wire
	sensor								operation only	short circuit	and connector
	abnormality
	Outdoor high							Continuous		High pressure	• High pressure
H64	pressure			○	○				―	sensor open	sensor
	sensor							for 1 minutes		circuit during	• Lead wire and
	abnormality									compressor stop	connector
	Outdoor fan							2 times		Outdoor fan motor	• Outdoor fan motor
											lead wire and
	motor			○	○		○
H97								happen within	―	lock or feedback	connector
	mechanism
	lock							30 minutes		abnormal	• Fan motor lock or
											block

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