Mitsubishi Electronics service manual Trouble Criterion of Main Parts MSZ-FD09NAMSZ-FD12NA

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9-5. TROUBLE CRITERION OF MAIN PARTS MSZ-FD09NAMSZ-FD12NA

Part name	Check method and criterion				Figure
Room temperature therm- Measure the resistance with a tester.
istor (RT11)	Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C.
Indoor coil thermistor
Indoor coil thermistor	board", the chart of thermistor.
(RT12, RT13)
Indoor fan motor (MF)	Check 9-6. .

	Measure the resistance between the terminals with a tester.
	(Part temperature 50 ~ 86°F (10 ~ 30°C))
Horizontal vane motor					RED
Horizontal vane motor		Color of the lead wire	Normal		ROTOR
(MV1)
(MV1)	Horizontal vane motor (MV1)		313 ~ 375 Ω		YLW
Vertical vane motor	Horizontal vane motor (MV1)		313 ~ 375 Ω		YLW
Vertical vane motor					BRN
(MV2)	Vertical vane motor (MV2)	BRN-other one	268 ~ 322 Ω		BRN
(MV2)	Vertical vane motor (MV2)	BRN-other one	268 ~ 322 Ω
i-see Sensor motor
i-see Sensor motor	i-see Sensor motor (MT)		223 ~ 268 Ω		ORN GRN
(MT)
(MT)

	Cover the i-see Sensor with black vinyl tape. Then, turn ON the power
	supply. (i-see Sensor is energized.) Measure the voltage between connector
	terminals of i-see Sensor with a tester.
	(Part temperature 50 ~ 104°F (10 ~ 40°C))
	i-see Sensor
				4			Cover the i-see
				3			Sensor with
				3			Sensor with
				2(GND)			black vinyl tape.


	i-see Sensor P.C. board			1
i-see Sensor (RR)	i-see Sensor P.C. board			connector
				connector

Black vinyl tape

i-see Sensor connector terminals	Normal range
(GND) - (+)	1.874 ~ 3.387 VDC
(+) - (GND)	1.010 ~ 1.420 VDC

NOTE: Pay attention to static electricity.

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Contents MSZ-FD09NA MSZ-FD12NA Specification has been corrected New model Accessories Part Names and FunctionsPower supply Phase, Hz 208/230 Weight External ﬁnishRemote controller Indoor modelOperating Range Outlet AIR Speed and Coverage RangeOutlines and Dimensions Unit inchAir Air outWiring Diagram Unitinch Refrigerant System DiagramRefrigerant flow in cooling Refrigerant flow in heating Service Functions Timer Short ModeHow to modify the remote controller P.C. board P.C. Board Modification for Individual OperationAuto Restart Function How to release Auto Restart FunctionOperation Microprocessor Control Refer toLamp lights during operation Lamp blinks in abnormal conditionDRY Operation Cool OperationHeat Operation Auto Change Over ··· Auto Mode Operation Mode selectionAuto Vane Operation Outdoor Unit MXZ seriesDirection Feet, set the horizontalVertical vane Area Setting See Control OperationSee Sensor Enlarged view of i-see SensorNighttime Cold area DaytimeLighted Not lighted Operation and operating range Center ·····Program Timer Changing temperature indication F/C Minute Time Delay OperationEMERGENCY/TEST Operation Troubleshooting Before troubleshooting, check the followingLead wiring Housing point Troubleshooting procedure How to replace batteriesFailure Mode Recall Function OFFIndoor unit failure mode table Power Instruction of Troubleshooting Troubleshooting Check Table Lighted BlinkingArea R Power Trouble Criterion of Main Parts MSZ-FD09NAMSZ-FD12NA Troubleshooting Flow Check of indoor fan motorPage Replace the horizontal vane motor, How to check miswiring and serial signal error Electromagnetic noise enters into TV sets or radios Indoor electronic control P.C. board Test Point Diagram and VoltageSW P.C. Board Power monitor receiver P.C. board Monitor P.C. board Disassembly Instructions Removing the panel PhotoOperating Procedure Photos Open the rear cover of the power monitor receiver P.CRemoving the nozzle assembly Removing the electrical box PhotoPhoto Removing the vertical vane motor unit Correct positionRemoving the horizontal vane motor Photo Removing the indoor fan motor and the line flow fan PhotoMade in Japan