Mitsubishi Electronics Understanding the Mitsubishi Failure Mode Recall Function for Air Conditioners

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9-2. Failure mode recall function

Outline of the function

This air conditioner can memorize the abnormal condition which has occurred once.

Even though LED indication listed on the troubleshooting check table disappears, the memorized failure details can be recalled.

This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.

1. Flow chart of the indoor/outdoor unit failure mode recall function

Operational procedure

The cause of abnormality cannot be found because the abnormality doesn't recur.

Setting up the failure mode recall function

Turn ON the power supply.

1While pressing both OPERATION SELECT

button and TOO COOL button on the remote controller at the same time, press RESET button.

2First, release RESET button.

And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds.

W1

Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed).

With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 24:.

1While pressing both OPERATION SELECT button and TOO COOL button on the

remote controller at the same time, press RESET button.

2First, release RESET button.

And release the other two buttons since all LCD

in operation display section of the remote controller is displayed after 3 seconds.

W1. Regardless of normal or abnormal, a short beep is emitted once as the signal is received.

Does POWER lamp on the indoor

unit blink at the interval of 0.5 seconds?

Blinks: Either indoor or outdoor unit is abnormal. Beep sounds are emitted at the same timing of the blinking of POWER lamp. W2

Judgment of indoor/outdoor abnormality

Yes

(Blinks)

No

(OFF)

Indoor unit is normal.

There is a possibility that the plasma or outdoor unit is abnormal. Confirm the presence of abnormality according to the flow chart of the the prasma unit or detailed outdoor unit failure mode recall function.

Before blinking, does POWER

Yes

lamp stay ON for 3 seconds?

 

 

Stays ON for 3 seconds (without beep):

 

 

The outdoor unit is abnormal.

 

 

 

No

 

 

 

 

 

 

 

 

 

The indoor unit is abnormal.

 

The outdoor unit is abnormal.

Check the blinking pattern, and refer to confirm the

 

Check the blinking pattern, and refer to confirm the abnormal point.

abnormal point(9-2.4.).

 

Make sure to check at least two consecutive blinking cycles. W3

Make sure to check at least two consecutive blinking cycles. W2

 

 

 

 

 

 

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures.

1With the remote controller headed towards the indoor unit, press any button that is not used in this failure mode recall function (e.g. TIMER button) .

OR

1Turn OFF the power supply and turn ON it again.

2Press RESET button of the remote controller.

•As for outdoor unit MUZ type, refer to service manual OB372. As for outdoor unit MXZ type, refer to service manual OB377.

Repair the defective parts.

Deleting the abnormal condition

1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above.

2Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.

3Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.

Note1.Make sure to release the failure mode recall function once it's set up, otherwis the unit cannot operate properly. 2.If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

W2. Blinking pattern when the indoor unit is abnormal:

 

 

 

 

Blinking at 0.5-

 

 

 

 

 

 

 

 

 

 

 

Blinking at 0.5-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5-second OFF

second interval

2.5-second OFF second interval

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Beeps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Beeps

 

 

 

Beeps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Repeated cycle

 

 

 

 

 

 

Repeated cycle

Repeated cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W3.Blinking pattern when the outdoor unit is abnormal:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blinking at 0.5-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blinking at 0.5-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5-second OFF

 

 

 

3-second ON

 

 

second interval

 

 

 

 

2.5-second OFF

3-second ON

second interval

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No beep

 

 

 

 

 

 

Beeps

 

 

 

 

 

 

 

 

 

 

 

 

No beep

 

 

 

 

Beeps

 

 

 

 

 

 

 

 

Repeated cycle

 

 

 

 

 

 

 

 

 

 

 

 

Repeated cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Repeated cycle

 

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Contents Contents MSZ-FA25VA E1 MSZ-FA35VA E1Front panel opening/closing output gear Technical ChangesGeneralized stepping motor Indoor Unit MSZ-FA25VA MSZ-FA35VA Wash reset switch Open Closed Receiving sectionPart Names and Functions See control operationMSZ-FA25VA E1 MSZ-FA35VA E1 Accessories Remote ControllerWhen outdoor unit is MXZ type SpecificationSpecifications and rating conditions of main electric parts MSZ-FA35VA E1 Noise Criteria CurvesMSZ-FA25VA E1 Indoor Unit Outlines and DimensionsMSZ-FA25VA E1 MSZ-FA35VA E1 Unit mmMSZ-FA25VA E1 Indoor Unit Wiring DiagramRefrigerant System Diagram MSZ-FA35VA E1 Indoor UnitRemote controller model KM05A Service FunctionsHow to modify the remote controller P.C. board OperationRemote controller Troubleshooting Install RemoveInformation for Multi System AIR Conditioner Outdoor Unit MXZ seriesFailure mode recall function OFFTo identify the error.Refer to 9-6.For G Plasma AIR Purifying Indoor unit failure mode tablePlasma Deodorizing OFFInstruction of troubleshooting StartTroubleshooting check table · Flashing of Power lamp indicates abnormalitiesPurifying 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 How to check mis-wiring and serial signal error LEDCheck of installation of the horizontal vane Safety Deviceplasma Unit Plasma Deodorizing 0V?Continuously flash? AIR Purifying 0V?Check of auto front panel Indoor unit and outdoor unit do not operateElectromagnetic noise enters into TV sets or radios YesPlasma power P.C. board Test point diagram and voltagePower monitor receiver P.C. board Indoor electronic control P.C. boardDisassembly Instructions Removing the panel PhotoOperating Procedure Photos Removing the electrical boxRemoving the indoor fan motor and the line flow Photo Removing the horizontal vane motor unit PhotoRemoving the vertical vane motor unit Photo FanRemoving the plasma power P.C. board Photo Parts List Accessory and Remote ControllerIndoor Unit Heat Exchanger Safety PlasmaIndoor Unit Electrical Parts and Functional Parts Motor Receiver P.C Board Holder509 Symbol Qty/unit Part name WiringDiagram E02 504Optional Parts Deodorizing Ceramic FilterPage Specifications subject to change without notice