Mitsubishi Electronics MUZ-GB50VA service manual Once Lighting

No.	Symptom	Indication		Abnormal point / Condition	Condition	Correspondence
		LED1(Red)	LED2(Yellow)
20	Outdoor unit	Once	Lighting	Primary current protection	When the input current exceeds 15A.	These symptoms do not mean any abnormality of the
	operates.					product, but check the following points.
				Secondary current protection	When the current of the compressor exceeds 15A.
						• Check if indoor filters are clogged.
		Twice	Lighting	High-pressure protection	When the indoor gas pipe temperature exceeds 45: during heating.	• Check if refrigerant is short.
21						• Check if indoor/outdoor unit air circulation is short cycled.
				Defrosting in cooling	When the indoor gas pipe temperature falls 3: or below during cooling.
22		3 times	Lighting	Discharge temperature		• Check refrigerant circuit and refrigerant amount.
					When the discharge temperature exceeds 100: during operation.	• Refer to 10-6.G"Check of LEV".
				protection
						• Refer to 10-6.B"Check of outdoor thermistors".
				Low discharge	When the frequency of the compressor is kept 80Hz or more and	• Refer to 10-6.G"Check of LEV".
23		4 times	Lighting		the discharge temperature is kept under 39: for more than 20
				temperature protection		• Check refrigerant circuit and refrigerant amount.
					minutes.
						This symptom does not mean any abnormality of the
				Cooling high-pressure	When the outdoor heat exchanger temperature exceeds 58:	product, but check the following points.
24		5 times	Lighting			• Check if indoor filters are clogged.
				protection	during operation.
						• Check if refrigerant is short.
						• Check if indoor/outdoor unit air circulation is short cycled.
	Outdoor unit
25	operates	9 times	Lighting	Inverter check mode	When the unit is operated with emergency operation switch.	-

26

Lighting

Lighting

Normal

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22