Mitsubishi Electronics P500YMF-C, PURY-P400 specifications 114

Checking code		Meaning, detecting method			Cause	Checking method & Countermeasure
4240	Over loard	If IAC 32 Arms is detected con-		1)	Air passage short cycle.	Is the unit’s exhaust short cycling?
	protection	tinuously for 10 minutes during op-
		eration of the inverter after 5 or		2)	The heat exchanger is clogged.	Clean the heat exchanger.
		more seconds have passed since
		the inverter started.		3)	Power supply voltage.	If the power supply voltage is less than
						342 V, it is outside specifications.
				4)	External air temperature.	If the external air temperature is over
						43° C it is outside the specifications.
				5)	Capacity setting error.	• Is the indoor unit capacity total cor-
							rect?
						•	Are the outdoor/indoor unit capac-
							ity settings correct?
				6)	The solenoid valves (SV1, 2) are	To judge failure of the solenoid valve,
					defective, or the solenoid valve	go to “Individual Parts Failure Judg-
					drive circuit is defective.	ment Methods” for the “Solenoid Valve.”
				7)	The wiring is defective.	Check 1 connections, 2 contact at the
						connectors and 3 for broken wires in
						the following wiring.
							TB1A~NF~TB1B
							TB1B~FANCON board~CN04
							CNMF~MF
							TB1B~CNTR1
							CNFC1~CNFC2
				8)	Fan motor (MF) operation is defec-	Go to “Treating Fan Motor Related
					tive.	Trouble.”
				9)	The inverter/compressor is defec-	Go to “Treating Inverter/Compressor
					tive.	Related Trouble.”
4250	IPM alarm	1 If over current, overheat or		1)	The power supply voltage is abnor-	•	Check if an instantaneous stop or
	output /	undervoltage of drive cirduit is			mal.		power failure, etc. has occurred.
	Bus voltage	detected by IPM during inverter				• Check if the voltage is the rated
	abnormality	operation.					voltage value.
		[Inverter error detail : 1]		2)	The wiring is defective.	Check 1, the connections, 2, contact
		2 If VDC	300 or VDC 760V
		is detected during inverter op-				at the connectors, 3 tightening torque
						at screw tightened portions, 4, wiring
		eration.
						polarities, 5, for broken wires, and 6,
		[Inverter error detail : 1]
						for grounding in the following wiring.
		3 If IAC	39Arms is detected
							TB1A~NF~TB1B, TB1A~DS~[52C,
		during inverter operation.
							R1, R5]~[C2, C3]~IPM Wiring
		[Inverter error detail : 11]
							CNDC1 (G / A) ~ CNVDC (INV) Wir-
							ing
						* Check if the wiring polarities are as
							shown on the wiring diagram plate.
				3)	The inverter / compressor is defec-	Go to “Treatment of Inverter/Compres-
					tive.	sor Related Trouble.”

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