Mitsumi electronic PKA-A18HA4 Error Code Abnormal point and detection method, Cause, operating

Error Code Abnormal point and detection method		Cause	Countermeasure
	Freezing/overheating protection is	(Cooling or drying mode)	(Cooling or drying mode)
	operating	Clogged filter (reduced airflow)	Check clogs of the filter.
	Freezing protection (Cooling mode)	Short cycle of air path	Remove blockage.
	The unit is in 6-minute resume prevention	Low load (low temperature)
	mode if pipe <liquid or condenser/evapo-	operation out of the tolerance
	rator> temperature stays under
		range
	the compressor started. Abnormal if it	Defective indoor fan motor	Refer to 9-6.
		• Fan motor is defective.
	again within 16 minutes after 6-minute	• Indoor controller board is defec-
	resume prevention mode.	tive.	Check outdoor fan motor.
		Defective outdoor fan control
		Overcharge of refrigerant	Check operating condition of refrigerant
		Defective refrigerant circuit	circuit.
		(clogs)
	Overheating protection (Heating mode)	(Heating mode)	(Heating mode)
		Clogged filter (reduced airflow)	Check clogs of the filter.
	The units is in 6-minute resume
		Short cycle of air path	Remove blockage.
	prevention mode if pipe <liquid or
		Overload (high temperature)
P6	condenser/evaporator> temperature is
		operation out of the tolerance
	detected as over 70°C[158°F] after the
		range
	compressor started. Abnormal if the
		Defective indoor fan motor	Refer to 9-6.
	temperature of over 70°C[158°F] is
		• Fan motor is defective.
	detected again within 10 minutes after
		• Indoor controller board is defec-
	6 minute resume prevention mode.
		tive.
			Check outdoor fan motor.
		Defective outdoor fan control
		Overcharge of refrigerant	~ Check operating condition of refrigerant
		Defective refrigerant circuit	circuit.
		(clogs)
		Bypass circuit of outdoor unit
		is defective.

	Pipe temperature		Slight temperature difference	~ Check pipe <liquid or condenser/evap-
	<Cooling mode>		between indoor room	orator> temperature with room tempera-
	Detected as abnormal when the pipe tem-		temperature and pipe <liquid	ture display on remote controller and
	perature is not in the cooling range 3 min-		or condenser/evaporator>	outdoor controller circuit board.
	utes after compressor start and 6 minutes		temperature thermistor	Pipe <liquid or condenser/evaporator>
	after the liquid or condenser/evaporator pipe		• Shortage of refrigerant	temperature display is indicated by set-
	is out of cooling range.		• Disconnected holder of pipe	ting SW2 of outdoor controller circuit
	Note 1) It takes at least 9 minutes to detect.		<liquid or condenser/	board as follows.
	Note 2) Abnormality P8 is not detected in		evaporator> thermistor		)
	drying mode.		• Defective refrigerant circuit	Conduct temperature check with outdoor
	Cooling range : -	(TH-TH1)	Converse connection of	controller circuit board after connecting
	TH: Lower temperature between liquid pipe		extension pipe (on plural units	(‘A-Control Service Tool(PAC-SK52ST)’.
	temperature (TH2) and condenser/		connection)
	evaporator temperature (TH5)		Converse wiring of indoor/	Check converse connection of extension
	TH1: Intake temperature		outdoor unit connecting wire	pipe or converse wiring of indoor/outdoor
P8	<Heating mode>		(on plural units connection)	unit connecting wire.
			Defective detection of indoor
	When 10 seconds have passed after the		room temperature and pipe
	compressor starts operation and the hot		<condenser/evaporator>
	adjustment mode has finished, the unit is		temperature thermistor
	detected as abnormal when condenser/		Stop valve is not opened
	evaporator pipe temperature is not in heat-		completely.
	ing range within 20 minutes.
	Note 3) It takes at least 27 minutes to
	detect abnormality.
	Note 4) It excludes the period of defrosting
	(Detection restarts when defrosting
	mode is over)
	Heating range :	(TH5-TH1)

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