Mitsubishi Electric MUH-GA50VB 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:

S
Samantha HernandezAug 15, 2025
What to do if Mitsubishi Electric Air Conditioner is flashing 4 times?
- B
  berrypatriciaAug 15, 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.
J
jimmykaiserAug 19, 2025
What does it mean when my Mitsubishi Electric MUH-GA50VB Air Conditioner flashes 2 times?
- B
  Brenda CaseyAug 19, 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.
N
Nicole MaldonadoAug 21, 2025
What does 7 flashes mean on a Mitsubishi Electric MUH-GA50VB Air Conditioner?
- E
  evillaAug 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.
L
luis51Aug 26, 2025
What does it mean when Mitsubishi Electric MUH-GA50VB Air Conditioner flashes 6 times?
- R
  Richard YoungAug 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".
M
Matthew SchneiderAug 28, 2025
What does 10 flashes mean on my Mitsubishi Electric MUH-GA50VB Air Conditioner?
- E
  ewhiteAug 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.
K
Kathleen RodriguezSep 1, 2025
What to do if Mitsubishi Electric Air Conditioner indoor unit only works with EMERGENCY OPERATION switch?
- T
  timothy78Sep 1, 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".
N
nicholasbarrettSep 4, 2025
What to do if Mitsubishi Electric MUH-GA50VB indoor unit doesn't operate with EMERGENCY OPERATION switch?
- J
  John ReynoldsSep 4, 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".
J
Jason LowerySep 7, 2025
What does it mean when my Mitsubishi Electric Air Conditioner flashes 3 times?
- C
  Crystal HernandezSep 8, 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".
V
Victoria DominguezSep 12, 2025
Why my Mitsubishi Electric MUH-GA50VB outdoor unit only operates in Test Run?
- P
  pdunnSep 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-GA50VB Specifications

General

Brand	Mitsubishi Electric
Model	MUH-GA50VB
Category	Air Conditioner
Language	English

Summary

Technical Changes

R410A Refrigerant Information

Details on R410A refrigerant, tools, and precautions for safe installation.

Unit Specifications

Wiring Diagrams

MUH-GA50VB Wiring

Electrical wiring diagram for MUH-GA50VB outdoor unit.

MUH-GA60VB Wiring

Electrical wiring diagram for MUH-GA60VB outdoor unit.

Refrigerant System Diagrams

MUH-GA50VB - E1 System Diagram

Refrigerant system diagram for MUH-GA50VB - E1 model.

MUH-GA50VB - E2 System Diagram

Performance Curves

Cooling Capacity Curves

Total Input (Cooling) Curves

Service Functions

Compulsory Defrost Mode

Procedure for forcing defrost mode for service purposes.

Defrost Setting Adjustments

How to change defrost interval and temperature settings.

Troubleshooting

Troubleshooting Precautions

Safety precautions and initial checks before troubleshooting.

Troubleshooting Steps

General steps and checks for diagnosing issues.

Disassembly Instructions

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