Mitsubishi Electronics MSZ-FA25VA Indoor unit failure mode table, Plasma Deodorizing, Off

4. Indoor unit failure mode table

NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table(9-4.).

POWER lamp	Abnormal point	Detection method	Check point
	(Failure mode)
Not lighted	Normal	–	–
1-time flash	Room temperature	When the room temperature thermistor short	Refer to the characteristics of the room
every 0.5-second	thermistor	or open circuit is detected every 8	temperature thermistor (9-7.).
		seconds during operation.
2-time flash		When the indoor coil thermistor short or open	Refer to the characteristic 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 (9-7.).
3-time flash	Serial signal error	When the serial signal from outdoor unit is	Refer to 9-6.D"How to check miswiring
2.5-second OFF		not received for a maximum of 6 minutes.	and serial signal error".
11-time flash		When the rotational frequency feedback	Refer to 9-6.A"Check of indoor fan
	Indoor fan motor	signal is not emit during 12-second the
2.5-second OFF			motor".
		indoor fan operation.
12-time flash		When 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.

5. PLASMA DEODORIZING/PLASMA AIR PURIFYING power failure mode table

POWER lamp	Abnormal point	Detection method	Check point
	(Failure mode)
	PLASMA DEODORIZING/	When PLASMA DEODORIZING/PLASMA	Replace the indoor electronic control P.C.
1-time flash	PLASMA AIR PURIFYING	AIR PURIFYING power cannot be turned
			board.
	power control	OFF.
		When the voltage between CN1 1(+)	Refer to 9-6.F"Check of PLASMA
		and 2(GND) on the PLASMA POWER P.C.
			DEODORIZING power" or 9-6.G"Check
2-time flash	Spark discharge	board (PLASMA DEODORIZING or PLASMA
		AIR PURIFYING) falls below 1.6V(spark	of PLASMA AIR PURIFYING power".
		discharge judgment voltage).
		When the voltage between CN1 1(+)	Refer to 9-6.F"Check of PLASMA
		and 2(GND) on the PLASMA POWER P.C.
	Abnormal electric		DEODORIZING power" or 9-6.G"Check
3-time flash		board (PLASMA DEODORIZING or PLASMA
	discharge error 1	AIR PURIFYING) falls 0.9V below the normal	of PLASMA AIR PURIFYING power".
		range voltage.
		When the voltage between CN1 1(+)	Refer to 9-6.F"Check of PLASMA
	Abnormal electric	and 2(GND) on the PLASMA POWER P.C.	DEODORIZING power" or 9-6.G"Check
4-time flash		board (PLASMA DEODORIZING or PLASMA	of PLASMA AIR PURIFYING power".
	discharge error 2
		AIR PURIFYING) falls significantly.
		(0.4V / 0.5ms)
		When the voltage between CN1 1(+)	Refer to 9-6.F"Check of PLASMA
	PLASMA DEODORIZING/	and 2(GND) on the PLASMA POWER P.C.
			DEODORIZING power" or 9-6.G"Check
5-time flash		board (PLASMA DEODORIZING or PLASMA
	PLASMA AIR PURIFYING		of PLASMA AIR PURIFYING power".
	power	AIR PURIFYING) rises above the normal
		voltage value (3V).

wAs soon as an error is detected, PLASMA DEODORIZING power or PLASMA AIR PURIFYING power goes OFF, therefore measuring instrument which records the voltage wave is required in order to perform the above men- tioned voltage measurement.

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