Sanyo UH3642 / CH3642, XH3642 / CH3642 service manual Possible cause of Malfunction Alarm Message

4. Service procedures

Possible Cause of Malfunction			Alarm
			message
Thermistor	Indoor thermistor is either open	Indoor coil temp. (E1 = TH1) cannot be detected.	F1
failure	or damaged.
		Indoor coil temp. (E2 = TH2) cannot be detected.	F2
		Indoor coil temp. (E3 = TH3) cannot be detected.	F3
		Indoor room (air-intake) temp. can not be detected.	F10
	Outdoor thermistor is either	Discharge gas temp. (comp. = TH0A) cannot be detected.	F4
	open or damaged.	Outdoor coil gas temp. (C2 = TH0C) cannot be detected.	F25
		Outdoor coil liquid temp. (C1 = TH0D) cannot be detected.	F7
EEPROM (ICB of PCB) failure			F29
Fault with	Protective device for comp. is	Comp. motor is overloaded.	H1
comp. and its	activated.	Comp. motor is locked.	H2
circuit
		Current of comp. cannot be detected when it is turned on.	H3
		Current of comp. is detected when it is not operated.	F27
		Comp. contactor (Mg SW) is chattering.	H18

Possible cause of Malfunction	Alarm
	message
Model setting of indoor unit is not matching the outdoor unit.	L2
When using group control, main indoor unit address setting is duplicated.	L3
(Judging by indoor unit.)
Outdoor unit address (R.C. No.) is duplicated.	L4
Priority setting of indoor unit is duplicated.	L5
—	L6
Improper wiring between indoor units.	L7
(There is group connection wiring in case of individual control.)
Capacity code of indoor unit is not set.	L9
Improper wiring of group control wiring.	L11

Possible Cause of Malfunction (The following messages are displayed only for the system controller.)			Alarm
			message
• Serial	System controller is transmitting	• Indoor or outdoor unit is not working correctly.
commu-		• Control lines between indoor unit, outdoor unit, and system	C05
nication	incorrect signal.	controller are not wired correctly.
errors
	System controller is detecting	• Same as for C05, above.	C06
• Mis-setting
	incorrect signal.	• Connector CN1 is not connected correctly.
Activation of	Protective device of the sub-	When using wireless remote controller or system controller,	P30
protective	indoor unit is activated in group	connect wired remote controller with the indoor unit temporarily
device	contorl.	to check the alarm message in detail.

NOTE

●R.C. : Refrigerant Circuit

●comp. : Compressor

●temp. : Temperature

● PCB : Printed Circuit Board

SM830082

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