Mitsubishi Electronics PUY-A12NHA2 Abnormalities detected while unit is operating, 63H worked

<Abnormalities detected while unit is operating>

Error Code	Abnormal point and detection method	Case	Judgment and action
	High pressure (High-pressure switch	1 Short cycle of indoor unit	1~6Check indoor unit and repair the defect.
	63H worked)	2 Clogged filter of indoor unit
	Abnormal if high-pressure switch 63H	3 Decreased airflow caused by
	worked ( w ) during compressor operation.	dirt of indoor fan
	w 4.15 MPa [602PSIG]	4 Dirt of indoor heat exchanger
	63H: High-pressure switch	5 Locked indoor fan motor
		6 Malfunction of indoor fan motor	7 Check if stop valve is fully open.
		7 Defective operation of stop
		valve (Not full open)
		8 Clogged or broken pipe	8 Check piping and repair the defect.
		9 Locked outdoor fan motor	9~2 Check outdoor unit and repair the defect.
		0 Malfunction of outdoor fan
		motor
		1 Short cycle of outdoor unit
U1		2 Dirt of outdoor heat exchanger	3 Check the inspected temperature of outside
		3 Decreased airflow caused by
(1302)
		defective inspection of outside	temperature thermistor on LED display.
		temperature thermistor	(SW2 on A-Control Service Tool : Refer to 10-
		(It detects lower temperature	10.)
		than actual temperature.)	4~6Turn the power off and check F5 is
		4 Disconnection or contact failure
		of connector (63H) on outdoor	displayed when the power is on again.
		controller board	When F5 is displayed, refer to “Judgment
		5 Disconnection or contact failure	and action” for F5.
		of 63H connection
		6 Defective outdoor controller
		board	7 Check linear expansion valve.
		7 Defective action of linear
		expansion valve	Refer to 10-6, 7.
		8 Malfunction of fan driving	8 Replace outdoor controller board.
		circuit
	High discharging temperature	1 Overheated compressor opera-	1 Check intake superheat.
	(1) Abnormal if discharge temperature ther-	tion caused by shortage of	Check leakage of refrigerant.
	mistor (TH4) exceeds 125:[257˚F] or	refrigerant	Charge additional refrigerant.
	110: [230˚F] continuously for 5 min-	2 Defective operation of stop	2 Check if stop valve is fully open.
	utes.	valve
	Abnormal if condenser/evaporator tem-	3 Defective thermistor	34 Turn the power off and check if U3 is dis-
	perature thermistor (TH5) exceeds 40:	4 Defective outdoor controller	played when the power is on again.
	[104˚F] during defrosting and discharge	board	When U3 is displayed, refer to “Judgement
	temperature thermistor (TH4) exceeds		and action” for U3.
	110: [230˚F].	5 Defective action of linear	5 Check linear expansion valve.
	(2) Abnormal if discharge superheat	expansion valve	Refer to 10-6, 7.
	(Cooling: TH4 – TH5 / Heating: TH4 –
	TH6) increases.
	All the conditions in A or B are detected
	simultaneously for 10 minutes continu-
	ously after 6 minutes past from com-
	pressor start-up (including the thermo-
U2	stat indication or recovery from defrost-
	ing).
(1102)	<Condition A>
	• Heating mode
	• When discharge superheat is less
	than 70 deg [126˚F].
	• When the TH6 temp is more than the
	value obtained by TH7 – 5 deg [9˚F].
	• When the condensing temp of TH5 is
	less than 35: [95˚F].

<Condition B>

•During comp operation (Cooling and Heating)

•When discharge superheat is less than 80 deg [144˚F] in cooling

•When discharge super heat is less than 90 deg [162˚F] in heating

•When condensing temp of TH6 is more than –40:[–40˚F] (In cooling only)

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