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Mitsubishi Electric MUH-GA80VB - User Manual

Mitsubishi Electric MUH-GA80VB
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SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································6
4. NOISE CRITERIA CURVES·······························8
5. OUTLINES AND DIMENSIONS ·························9
6. WIRING DIAGRAM ··········································10
7. REFRIGERANT SYSTEM DIAGRAM··············12
8. PERFORMANCE CURVES······························15
9. SERVICE FUNCTIONS ····································25
10. TROUBLESHOOTING······································25
11. DISASSEMBLY INSTRUCTIONS·····················35
12. PARTS LIST······················································39
13. RoHS PARTS LIST···········································46
Wireless type
Models
MUH-GA50VB -
MUH-GA50VB -
MUH-GA60VB -
MUH-GA80VB -
E1
E1
E2
E1
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
MUH-GA50VB
NOTE:
This service manual describes technical data of outdoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
HFC
utilized
R410A
OUTDOOR UNIT
No. OB368
REVISED EDITION-B
Please void OB368 REVISED EDITION-A.
Revision:B
• MUH-GA50VB- has been added.
E2
Indoor unit service manual
MSH-GA•VB Series (OB367)
OB368B-1.qxp 07.5.21 8:06 PM Page 1

Table of Contents

Questions and Answers

  • K
    Kenneth HinesAug 14, 2025
    What to do if Mitsubishi Electric MUH-GA80VB is flashing 4 times?
    • M
      mmartinAug 14, 2025
      If your Mitsubishi Electric Air Conditioner is flashing 4 times, it indicates a problem with the indoor unit control system. The suggested solution is to replace the indoor electronic control P.C. board.
  • H
    hramirezAug 18, 2025
    What does it mean when my Mitsubishi Electric Air Conditioner flashes 2 times?
    • B
      branchdavidAug 18, 2025
      If your Mitsubishi Electric Air Conditioner is flashing twice, it indicates a problem with the room temperature or indoor coil thermistor. Check the room temperature thermistor to resolve this issue.
  • M
    morganbrookeAug 21, 2025
    What does 7 flashes mean on a Mitsubishi Electric MUH-GA80VB Air Conditioner?
    • J
      Jose HarrisAug 21, 2025
      If your Mitsubishi Electric Air Conditioner flashes 7 times, this indicates an issue with the outdoor control system. The suggested solution is to replace the deicer P.C. board.
  • V
    Veronica JohnstonAug 25, 2025
    What does it mean when Mitsubishi Electric Air Conditioner flashes 6 times?
    • S
      Sean CarterAug 26, 2025
      If your Mitsubishi Electric Air Conditioner is flashing 6 times, it indicates a problem with the thermistor. Refer to 10-4.F "Check of outdoor thermistor".
  • S
    Samuel CoxAug 28, 2025
    What does 10 flashes mean on my Mitsubishi Electric MUH-GA80VB?
    • K
      keithryanAug 28, 2025
      If your Mitsubishi Electric Air Conditioner is flashing 10 times, it indicates a trouble of low discharge temperature protection. Refer to the indoor unit service manual.
  • R
    rebecca72Aug 31, 2025
    What to do if Mitsubishi Electric MUH-GA80VB Air Conditioner indoor unit only works with EMERGENCY OPERATION switch?
    • R
      rebeccasmithAug 31, 2025
      If the indoor unit of your Mitsubishi Electric Air Conditioner only operates when the EMERGENCY OPERATION switch is pressed, check the indoor/outdoor connecting wire. Refer to "Check of indoor electronic control P.C. board".
  • W
    woodscindySep 3, 2025
    What to do if Mitsubishi Electric Air Conditioner indoor unit doesn't operate with EMERGENCY OPERATION switch?
    • R
      ronnie27Sep 3, 2025
      If the indoor unit of your Mitsubishi Electric Air Conditioner doesn't operate even when the EMERGENCY OPERATION switch is pressed, check the indoor / outdoor connecting wire. Refer to "Check of indoor electronic control P.C. board".
  • A
    Angela ArcherSep 6, 2025
    What does it mean when my Mitsubishi Electric Air Conditioner flashes 3 times?
    • C
      Charles CobbSep 7, 2025
      If your Mitsubishi Electric Air Conditioner is flashing 3 times, it indicates a problem with the indoor fan motor. Refer to "Check of indoor fan motor".
  • P
    Patricia CollinsSep 10, 2025
    Why my Mitsubishi Electric MUH-GA80VB outdoor unit only operates in Test Run?
    • L
      Lance HarveySep 12, 2025
      If the outdoor unit of your Mitsubishi Electric Air Conditioner operates only in Test Run operation, check the room temperature thermistor. Refer to "Test point diagram and voltage".

Summary

Technical Changes

R410 A Refrigerant Information

Key information for R410A refrigerant systems.

Specification

Refrigerant System Diagram

Performance Curves

Troubleshooting

Troubleshooting Cautions

Important safety and procedural notes before troubleshooting.

Troubleshooting Flowcharts

Step-by-step guides for diagnosing unit issues.

Parts List

MUH-GA50 VB Parts

List of parts for MUH-GA50VB.

MUH-GA60 VB Parts

MUH-GA80 VB Parts

Mitsubishi Electric MUH-GA80VB Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMUH-GA80VB
CategoryAir Conditioner
LanguageEnglish

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