Mitsubishi Electronics P500YMF-C, PURY-P400 specifications 112, Vdc, TB1A~NF~TB1B, TB1B~DS~52C

Checking code			Meaning, detecting method			Cause	Checking method & Countermeasure
4116	Fan speed	(Detects only for PKFY-VAM)			1)	Slipping off of fan speed detect-	•	Confirm slipping off of connector
	abnormality	1. Detecting fan speed below				ing connector (CN33) of indoor		(CN33) on indoor controller
	(motor		180rpm or over 2000rpm dur-			controller board.		board.
	abnoramlity)		ing fan operation at indoor unit
			(first detection) enters into the		2)	Slipping off of fan output connec-	•	Confirm slipping off of connector
			3-minute restart prevention			tor (FAN1) of indoor power board.		(FAN1) on indoor power board.
			mode to stop fan for 30 sec-
			onds.		3)	Disconnection of fan speed	•	Check wiring for disconnection.
		2.	When detecting fan speed be-			detecting connector (CN33) of
			low 180rpm or over 2000rpm			indoor controller board, or that of
			again at fan returning after 30			fan output connector (FAN1) of
			seconsd from fan stopping, er-			indoor power board.
			ror stop (fan also stops) will be
			commenced displaying 4116.		4)	Filter cologging.	•	Check filter.
					5) Trouble of indoor fan motor.		•	Check indoor fan motor.
					6) Faulty fan speed detecting circuit		•	When aboves have no trouble.
						of indoor controller board, or	1)	For trouble after operating fan.
						faulty fan output circuit of indoor		Replace indoor controller board. If
						power board.		not remedied, replace indoor
								power board.
							2)	For trouble without operating fan.
								Replace indoor power board.
4200	VDC	1	If VDC	304 V is detected just	1)	Power supply voltage is abnor-	•	Check if an instantaneous power
	sensor/circuit		before the inverter starts.			mal.		failure or power failure, etc. has
	abnormality	2	If VDC	750 V is detected just				occurred.
			before starting of and during				•	Check if the voltage is the rated
			operation of the inverter.					voltage value.
					2) The wiring is defective.		Check 1, the connections, 2, contact
							at the connectors, 3 tightening torque
							at screw tightened portions, 4, wiring
							polarities, 5, for broken wires, and 6,
							for grounding in the following wiring.
								TB1A~NF~TB1B, TB1B~DS~[52C,
								R1, R5]~[C2, C3]~IPM Wiring
								CNDC1 (G / A) ~ CNVDC (INV) Wir-
								ing
							*	Check if the wiring polarities are as
								shown on the wiring diagram plate.
					3) The rush current prevention		To judge failure of R1 and R5, go to
						resistors (R1, 5) are defective.	“Individual Parts Failure Judgment
							Methods.”
					4)	The electromagnetic contactor	To judge failure of the 52C, go to
						(52C) is defective.	“Individual Parts Failure Judgment
							Methods.”
					5)	The diode stack (DS) is defective.	To judge failure of the DS, go to
							“Individual Parts Failure Judgment
							Methods.”
					6)	The reactor (DCL) is defective.	To judge failure of the DCL, go to
							“Individual Parts Failure Judgment
							Methods.”
					7)	The INV board is defective.	If none of the items in 1) to 6) is
							applicable, and if the trouble
							reappears even after the power is
							switched on again, replace the INV
							board (when replacing the circuit
							board, be sure to connect all the
							connectors, ground wires, etc.
							securely).

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