Mitsubishi Electric MUH-GA80VB User Manual

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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".

Mitsubishi Electric MUH-GA80VB Specifications

General

Brand	Mitsubishi Electric
Model	MUH-GA80VB
Category	Air Conditioner
Language	English

Summary

Technical Changes

R410A 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-GA50VB Parts

List of parts for MUH-GA50VB.

MUH-GA60VB Parts

MUH-GA80VB Parts

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