Mitsubishi Electronics MSZ-FD25VAS, MSZ-FD35VAS Instruction of Troubleshooting, Start

Page 24

Refer to 10-6. Refer to 10-6. Check room Refer to 10-6. Replace the Refer to

of serial signal

POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp

10-3. INSTRUCTION OF TROUBLESHOOTING

Start

w"Test Run operation" means the operation within 30 minutes after

EMERGENCY OPERATION switch is pressed.

If blinking of OPERATION INDICATOR lamp cannot

be checked, it can be checked with failure mode recall function.

Indoor unit operates. Outdoor unit doesn't operate.

Indoor unit operates. Outdoor unit doesn't operate normally.

Indoor unit doesn't receive the signal from remote controller.

OPERATION INDICATOR lamp on the indoor unit is flashing on and off.

Outdoor unit			Outdoor unit
operates only			doesn't
in Test Run			operate
operation. w			even in
			Test Run
			operation. w

Check room		Refer to
temperature		"How to check
thermistor.		inverter/
Refer to 10-7.		compressor".
"Test point
diagram and
voltage".

Unit doesn't			Indoor unit
operate			operates, when
normal			EMERGENCY
operation in			OPERATION
COOL or			switch is pressed.
HEAT mode.

Refer to		Refer to 10-6.B
"Check of		"Check of
R.V. coil".		remote controller
		and receiver
		P.C. board".

Indoor unit doesn't operate, when

EMERGENCY

OPERATION switch is pressed.

1.Check indoor / outdoor connecting wire. (Check if the power is supplied to the indoor unit.)

2.Refer to 10-6.C"Check of indoor electronic control P.C. board and indoor fan motor".

PLASMA lamp 2-time flash cause:

Indoor unit

•Trouble of PLASMA operation

Refer to 10-6.F"Check of PLASMA operation".

Refer to outdoor unit service manual.

	All lamps
	Flash on and off		Flash on and off		2-time flash
	at 0.5-second		at 0.5-second		Cause:
	intervals		intervals		Indoor unit
	Cause:
			Cause:		• Trouble of
	Indoor unit
			Indoor/		room temp-
	• The horizontal
			Outdoor unit		erature/
	vane is not
			• Miswiring		indoor coil
	installed
			or trouble		thermistor
	correctly.

3-time flash Cause: Indoor unit

•Trouble of indoor fan motor

4-time flash Cause: Indoor unit

•Trouble of indoor unit control system

5-time flash			6-time flash			7-time flash			14-time flash
Cause:			Cause:			Cause:			Cause:
Outdoor unit			Outdoor unit			Outdoor unit			Outdoor unit
• Outdoor			• Trouble of			• Trouble of			• Other
power			thermistor			outdoor			abnormality
system			in outdoor			control
abnormality			unit			system

E "Check of		D "How to
installation of		check of
the horizontal		miswiring
vane".		and serial
		signal error.

temperature		A "Check of		indoor
thermistor		indoor fan		electronic
and indoor		motor".		control
coil thermis-				P.C. board.
tor.
Refer to 10-7.
"Test point
diagram and
voltage".

		Refer to		Replace the		Check
"How to check		"Check of		inverter P.C.		"Flow chart of
inverter/		outdoor		board or		the detailed
compressor".		thermistors".		the outdoor		outdoor unit
				electronic		failure mode
				control P.C.		recall function."
				board.

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Image 24

Contents MSZ-FD25VA E1 MSZ-FD25VAS E1 MSZ-FD35VA E1 MSZ-FD35VAS E1 Page Technical Changes Part Names and Functions See control operationSpecification Specifications and rating conditions of main electric partsIndoor model Noise Criteria Curves MSZ-FD25VA MSZ-FD25VASOutlines and Dimensions Wiring DiagramUnit mm Refrigerant System Diagram Unit mmService Functions Timer Short ModeP.C. Board Modification for Individual Operation J1 J2Remote Controller Auto Restart FunctionOperation Microprocessor Control OPERATE/STOPAuto Change Over ··· Auto Mode Operation Cool OperationDRY Operation Heat OperationAuto Vane Operation Outdoor Unit MXZ seriesHorizontal vane Vertical vane COOL/DRY HeatArea Setting See Control OperationSee Sensor Daytime Plasma Operation Operation and operating rangeClean Operation Timer OperationProgram Timer Minute Time Delay Operation Emergency Operation switch E.O.SWEMERGENCY/TEST Operation Troubleshooting Failure Mode Recall Function OFFFlow chart of Plasma operation failure mode recall function Plasma operation checkIndoor unit failure mode table Plasma operation failure mode tableInstruction of Troubleshooting StartTroubleshooting Check Table An abnormality other than above mentioned is detectedPlasma Trouble Criterion of Main Parts Troubleshooting Flow Power lamp flashes 3-time Indoor fan does not operateYes Check of indoor P.C. board and indoor fan motor How to check miswiring and serial signal error Check of installation of the horizontal vane Electromagnetic noise enters into TV sets or radios Test Point Diagram and Voltage Indoor electronic control P.C. boardSW P.C. Board CN1 Disassembly Instructions Removing the panel PhotoPower monitor receiver Removing the nozzle assembly Photo Removing the electrical box PhotoRemoving the vertical vane motor unit Photo Removing the horizontal vane motor Photo Removing the indoor fan motor and the line flow fan PhotoSpecifications subject to change without notice