Mitsubishi Electronics MSZ-FA35VA, MSZ-FA25VA service manual Troubleshooting

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9

TROUBLESHOOTING

MSZ-FA25VA - E1

MSZ-FA35VA - E1

9-1. Cautions on troubleshooting

1.Before troubleshooting, check the following:

1)Check the power supply voltage.

2)Check the indoor/outdoor connecting wire for mis-wiring.

2.Take care the following during servicing.

1)Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

2)Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board.

3)When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.

4)When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring

Housing point

3.Troubleshooting procedure

1)First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2)Before servicing check that the connector and terminal are connected properly.

3)If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.

4)When troubleshooting, refer to 9-2., 9-3. and 9-4.

4.How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, replace the batteries to operate the remote controller normally.

1Remove the front lid and insert batteries. Then reattach the front lid.

2Press RESET button with tip end of ball point pen or the like, and then use the remote controller.

Insert the negative pole of the

batteries first. Check if the polarityRESET button of the batteries are correct.

NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.

2.This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced. This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement.

5.How to install the horizontal vane

If horizontal vane is not installed correctly, All of the operation indicator lamps will blink.

In this case, install the horizontal vane correctly by following the procedures 1 to 2.

NOTE: Before installation of the horizontal vane, turn OFF the power supply.

1

2

Stopper

Left

 

In procedure 2 lock the

 

stoppers until they click

 

 

 

 

into place.

 

 

Lock.

Insert this end first.

 

 

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Contents MSZ-FA25VA E1 MSZ-FA35VA E1 ContentsFront panel opening/closing output gear Technical ChangesGeneralized stepping motor See control operation Wash reset switch Open Closed Receiving sectionPart Names and Functions Indoor Unit MSZ-FA25VA MSZ-FA35VARemote Controller MSZ-FA25VA E1 MSZ-FA35VA E1 AccessoriesWhen outdoor unit is MXZ type SpecificationSpecifications and rating conditions of main electric parts MSZ-FA35VA E1 Noise Criteria CurvesMSZ-FA25VA E1 Unit mm Outlines and DimensionsMSZ-FA25VA E1 MSZ-FA35VA E1 Indoor UnitMSZ-FA35VA E1 Indoor Unit Wiring DiagramRefrigerant System Diagram MSZ-FA25VA E1 Indoor UnitOperation Service FunctionsHow to modify the remote controller P.C. board Remote controller model KM05ARemote controller Troubleshooting Remove InstallOutdoor Unit MXZ series Information for Multi System AIR ConditionerOFF Failure mode recall functionTo identify the error.Refer to 9-6.For G OFF Indoor unit failure mode tablePlasma Deodorizing Plasma AIR PurifyingStart Instruction of troubleshooting· Flashing of Power lamp indicates abnormalities Troubleshooting check tablePurifying PlasmaAIR Trouble criterion of main parts Check of indoor fan motor Troubleshooting flowWhen Power lamp flashes 3-time Indoor fan does not operate Check of remote controller and receiver P.C. board Indoor electronic control P.C.Board LED How to check mis-wiring and serial signal errorCheck of installation of the horizontal vane Plasma Deodorizing 0V? Safety Deviceplasma UnitAIR Purifying 0V? Continuously flash?Indoor unit and outdoor unit do not operate Check of auto front panelYes Electromagnetic noise enters into TV sets or radiosIndoor electronic control P.C. board Test point diagram and voltagePower monitor receiver P.C. board Plasma power P.C. boardRemoving the panel Photo Disassembly InstructionsRemoving the electrical box Operating Procedure PhotosFan Removing the horizontal vane motor unit PhotoRemoving the vertical vane motor unit Photo Removing the indoor fan motor and the line flow PhotoRemoving the plasma power P.C. board Photo Accessory and Remote Controller Parts ListMotor Receiver P.C Board Holder Safety PlasmaIndoor Unit Electrical Parts and Functional Parts Indoor Unit Heat Exchanger504 Symbol Qty/unit Part name WiringDiagram E02 509Deodorizing Ceramic Filter Optional PartsPage Specifications subject to change without notice