Mitsubishi Electric MSZ-AY42VGK-E6 User Manual

SERVICE MANUAL
INDOOR UNIT
PARTS CATALOG (OBB930)
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················4
3. SPECIFICATION ········································5
4. NOISE CRITERIA CURVES ··························6
5. OUTLINES AND DIMENSIONS ·····················7
6. WIRING DIAGRAM ·····································8
7. REFRIGERANT SYSTEM DIAGRAM ··········· 10
8. SERVICE FUNCTIONS ······························ 11
9. MICROPROCESSOR CONTROL ·················17
10. TROUBLESHOOTING ······························· 25
11. DISASSEMBLY INSTRUCTIONS ················· 41
Models
MSZ-AY25VGK -
E6
MSZ-AY25VGKP -
E6
MSZ-AY35VGK -
E6
MSZ-AY35VGKP -
E6
MSZ-AY42VGK -
E6
MSZ-AY42VGKP -
E6
MSZ-AY50VGK -
E6
MSZ-AY50VGKP -
E6
Outdoor unit service manual
MUZ-AY∙VG/VGH Series (OBH931)
MXZ-F∙VF/VFH Series (OBH790)
No. OBH930

Mitsubishi Electric MSZ-AY42VGK-E6 Specifications

General

Cooling Capacity	4.2 kW
Power Supply	220-240 V, 50 Hz
Refrigerant	R32
Outdoor Unit Noise Level	50 dB(A)
Energy Efficiency Class Cooling	A+++
Indoor Unit Noise Level	19 dB(A)

Summary

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

SERVICE FUNCTIONS

AUTO RESTART FUNCTION

Wi-Fi INTERFACE SETTING UP

Guides connection of the Wi-Fi interface to a router.

CHANGING THE CORRECTION VALUE OF THE ROOM TEMPERATURE (THE INLET TEMPERATURE)

MICROPROCESSOR CONTROL

WIRELESS REMOTE CONTROLLER

Details the functions and layout of the wireless remote controller.

COOL (C) OPERATION

HEAT (0) OPERATION

AUTO CHANGE OVER ... AUTO MODE OPERATION

TIMER OPERATION

EMERGENCY/TEST OPERATION

3-MINUTE TIME DELAY OPERATION

TROUBLESHOOTING

CAUTIONS ON TROUBLESHOOTING

Important safety and preparatory steps before troubleshooting.

Troubleshooting procedure

General steps to diagnose and identify issues.

FAILURE MODE RECALL FUNCTION

Recalls and displays past error codes and abnormal conditions.

Table of indoor unit failure mode recall function

Lists indoor unit error codes and remedies.

INSTRUCTION OF TROUBLESHOOTING

Detailed troubleshooting steps based on symptoms.

Check of Wi-Fi interface

TROUBLESHOOTING CHECK TABLE

Comprehensive table of symptoms, conditions, and remedies.

TROUBLESHOOTING CRITERION OF MAIN PARTS

Measurement criteria for key electronic components.

TROUBLESHOOTING FLOW

Check of remote controller and indoor electronic control P.C. board

Check of indoor P.C. board and indoor fan motor

How to check miswiring and serial signal error

Procedure to diagnose wiring and communication errors.

TEST POINT DIAGRAM AND VOLTAGE

Diagrams and voltage values for testing electronic components.

DISASSEMBLY INSTRUCTIONS