Mitsubishi Electronics MR-G50J-SS-NZ Error Abnormality Possible cause Symptom Treatment Code E56

Inverter-related indication “Compressor does not operate”
Error	Abnormality	Possible cause	Symptom		Treatment
code
e56	•Defective wiring •Defective connec- (1) or (2)			1.Locate the trouble and deside the treatment
	continuity	tion of connectors (1)Compres		•Decide the treatment by checking the followings.
	•Trouble of the	related to com-	sor can	(1) Defective connector connections.
	control board	pressor	not be	(board-side,relay,comp-side)
			activeted
		(board-side,relay,		(2) Resistance of compressor’s winding
			for more
		comp-side)	than 1.5	2.Flowchart of troubleshooting
		•Defective wiring	hours			Check	Treatment
		continuity of the	(2)Overcurr
		compressor
			ent	start
		•Trouble of control
			detection
		board	error
		•Trouble of	occurred
			before	Connector CN50G on the		No
		compressor
			the com-	control board is properly			Connect properly.
			presssor	connected?
			is	Yes
			actived.
				6-pin relay connector in machine		No
				chamber is properly connected?
	Compressor			Yes
		6-pin relay connector in machine chamber		The connector of compressor		No
			Control board	is properly connected?
Point+2 (to measure resistance)		Point+1 (to measure resistance)		Yes
For checking the connection						Measure the
to compressor		For checking the relay		Disconnect 6-pin relay
		connection				resistance of
	Lead wires connected			connector in machine	No	compressor’s	No
	to compressor			chamber and measure		winding
							Exchange
				the resistance		between each	the unit
				between each terminal		terminal
				of 1,2and 3(Pont 1).		(Point 2).
				Approx.		Approx.9.3"￿
				9.3"(At 20:)?		(At20:)?

	Yes			Yes
Is compressor being			Replace the lead wire connected to compressor.
		No
energized at startup?
			Replace the control board.
	Yes
Exchange the unit			Replace it only when error display
			keeps blinking even though all the
			above mentioned connectors are
			properly connected.

3.Recheck after treatment

•After any treatment is tried, unplug and plug power cord again to check if the compressor operates properly.

•If the compressor can operate properly for more than 1 minute after power cord is plugged again, it’s presumed that the couse of trouble is eliminated.

*If the couse of trouble cannot be eliminated,”e56” will be displayed again 1 minute later after the power cord is plugged again.

*If the control board has been replaced,e56 won’t be dis- played even though the couse of trouble is still not elimi- nated. In such a case,perform the ice making test opera- tion to check what the error is. At the same time, also con- firm that the compressor is operating for more than 3 min- utes and each compartment is getting cooled.

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