Mitsubishi Electronics MSZ-FD25VAS, MSZ-FD35VAS service manual Indoor unit failure mode table

4. Indoor unit failure mode table

POWER lamp	Abnormal point	Condition	Correspondence
	(Failure mode)
Not lighted	Normal	—	—
1-time flash	Room temperature	The room temperature thermistor short	Refer to the characteristics of the room
		or open circuit is detected every 8 seconds
every 0.5-second	thermistor		temperature thermistor (10-7.).
		during operation.
2-time flash		The indoor coil thermistor short or open	Refer to the characteristics of the main
	Indoor coil thermistor	circuit is detected every 8 seconds during	indoor coil thermistor, the sub indoor coil
2.5-second OFF
		operation.	thermistor (10-7.).
3-time flash	Serial signal	The serial signal from outdoor unit is	Refer to 10-6.D"How to check miswiring
2.5-second OFF		not received for 6 minutes.	and serial signal error".
11-time flash		The rotational frequency feedback signal is	Refer to 10-6.A"Check of indoor fan
	Indoor fan motor	not sent out for 12-seconds after indoor fan
2.5-second OFF			motor".
		motor is operated.
12-time flash		It cannot properly read data in the	Replace the indoor electronic control
	Indoor control system	nonvolatile memory of the indoor electronic
2.5-second OFF			P.C. board.
		control P.C. board.

NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).

5. PLASMA operation failure mode table

POWER lamp	Abnormal point	Condition	Correspondence
	(Failure mode)
		PLASMA power supply cannot be turned	Replace the indoor electronic control
1-time flash	PLASMA power supply	OFF even if the PLASMA operation is turned	P.C.board.
	control	OFF with the remote controller.
		The voltage between CN1 3(+) and 2(GND)
2-time flash	Spark discharge	on the PLASMA POWER P.C.board falls
		below 1.6 V(spark discharge judgment
		voltage).
	Abnormal electric	The voltage between CN1 3(+) and 2(GND)	Refer to 10-6.F"Check of PLASMA
3-time flash		on the PLASMA POWER P.C.board falls by	operation".
	discharge error 1	0.9 V below the normal voltage value (3 V).
		The voltage between CN1 3(+) and 2(GND)
4-time flash	Abnormal electric	on the PLASMA POWER P.C.board falls
	discharge error 2	significantly. (0.4 V / 0.5 ms)
		The voltage between CN1 3(+) and 2(GND)
5-time flash	PLASMA DEODORIZING	on the PLASMA POWER P.C board rises
		above the normal voltage value (3 V).

NOTE1 : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).

NOTE2 : As soon as an abnormality is detected, PLASMA operation goes OFF, therefore measuring instrument which records the voltage wave is required in order to perform the above mentioned voltage measurement.

NOTE3 : When POWER lamp flashes 1-time or 2-time, Please perform PLASMA operation check (Refer to 10-2.3).

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