Mitsubishi Electronics MUZ-GB50VA service manual Operational procedure

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2. Flow chart of the detailed outdoor unit failure mode recall function

Operational procedure

The outdoor unit might be abnormal.

Confirm if outdoor unit is abnormal according to the following procedures.

Confirm that the remote controller is in the failure mode recall function.

With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 25:. W1

Does left lamp of OPERATION INDICATOR lamp

No

on the indoor unit blink at the interval of 0.5 seconds?

(OFF)

Blinks: The outdoor unit is abnormal.

 

Beep are emitted at the same

 

timing as the blinking of the left lamp of

 

OPERATION INDICATOR lamp. W2

 

 

Yes

 

 

 

 

(Blinks)

 

The outdoor unit is abnormal.

Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to 10-2.3.).

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

Releasing the failure mode recall function

W1. Regardless of normal or abnormal, 2 short beeps are emitted as the signal is received.

The outdoor unit is normal.

Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again.

Press RESET button of the remote controller.

Release the failure mode recall function according to the left mentioned procedure.

Repair the defective parts.

Deleting the abnormal memorized condition

1After repairing the unit, recall the failure mode again according to

"Setting up the failure mode recall function" mentioned above.

2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.

4Release 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, otherwise 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 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 Revised EDITION-A R410A Refrigerant OBR01 ContentsMUZ-GA50VA E1 Technical ChangesSNB130FLDH SNB130FLDH1Accessories SpecificationPart Names and Functions MUZ-GB50VASpecifications and rating conditions of main electric parts Band Octave Noise Criteria CurvesMUZ-GB50VA Outdoor Unit Outlines and DimensionsOutdoor Unit MUZ-GB50VA Wiring DiagramUnitmm Refrigerant System DiagramCapacity and input curves Performance CurvesIndoor Unit Outdoor Unit MUZ-GB50VA Test RUN Operation How to operate fixed-frequency operationCool operation Performance Data Cool operation Rated frequency 79Hz MSZ-GB50VA MUZ-GB50VAOutdoor SHC SHF InputOutdoor DB Performance Data Heat operation Actuator ControlOutdoor fan motor control R.V. coil controlRelation between main sensor and actuator MUZ-GB50 TroubleshootingOFF Failure mode recall functionOperational procedure Outdoor unit failure mode table Time flash Communication error Lighting Indicator Instruction of troubleshootingOperation EmergencyOperate Lightning Twice Outdoor power system Troubleshooting check table MUZ-GB50VAOnce Lighting RED BLK BLK WHT Trouble criterion of main parts MUZ-GB50VAWHT RED RED ORNTroubleshooting flow How to check inverter/ compressorCheck of outdoor thermistors Check of R.V. coil When heating operation does not workCheck of outdoor fan motor Check of power supplyCheck of LEV Check of current-limiting resistorParts side Electromagnetic noise enters into TV sets or radios Discharge temperature thermistor RT62 Noise filter P.C. board CN2 Outdoor power boardCN3 CN5Removing the cabinet Photo Disassembly InstructionsMUZ-GB50VA Outdoor Unit Operating Procedure Photos Removing R.V. coil Operating Procedure PhotosRemoving outdoor fan motor Photo Ture thermistor and ambient temperature thermistorRemoving the reactor Removing the compressor and 4-way valve PhotoRoHS Parts List RoHS compliant MUZ-GB MUZ-GB50 MUZ-GB50VA Accessory