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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-AP15VG
MSZ-AP20VG
MSZ-AP15VGK
MSZ-AP20VGK
MSZ-AP15VG
MSZ-AP20VG
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E1
ET1
ER1
E2
ET2
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,
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E1
ET1
ER1
E2
ET2
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E1
ET1
ER1
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Outdoor unit service manual
MUZ-AP∙VG Series (OBH839)
MXZ-D∙VA Series (OBH626)
MXZ-E∙VA Series (OBH723)
MXZ-F∙VF Series (OBH790)
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 ··········· 11
8. SERVICE FUNCTIONS ······························ 12
9. MICROPROCESSOR CONTROL ················ 14
10. TROUBLESHOOTING ······························· 21
11. DISASSEMBLY INSTRUCTIONS ················· 35
PARTS CATALOG (OBB838)
Revision B:
• MSZ-AP15/20VG-
,
and
E2
ET2
MSZ-AP15/20VGK-
,
E1
ET1
been added.
OBH838 REVISED EDITION-A is void.
No. OBH838
REVISED EDITION-B
,
have
ER1
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Table of Contents
Related Manuals for Mitsubishi Electric MSZ-AP20 VGK
Summarization of Contents
Technical Changes
New model introduction
Details about new model introductions and their configurations.
Remote controller functionality changes
Information regarding updates or changes to the remote controller functionality.
Part Names and Functions
Included accessories list
Lists all included accessories with the indoor unit.
Service Functions
Timer short mode operation
Shortens the timer set time for service purposes.
Setting remote controller for specific indoor unit
How to assign unique remote controllers to individual indoor units.
Auto restart function
Enables automatic unit restart with previous settings after power loss.
Wi-Fi interface setup
Instructions for connecting and setting up the Wi-Fi interface.
Microprocessor Control
Wireless remote controller overview
Details on the features and operation of the wireless remote controller.
Indoor unit display section
Explanation of indicator lamps and their meanings on the indoor unit.
Cool operation modes
Explains COOL mode, coil frost prevention, and low temperature operation.
Dry operation modes
Explains DRY mode, coil frost prevention, and low temperature operation.
Fan operation mode
Details fan-only operation, including fan speed selection.
Heat operation modes
Explains HEAT mode, cold air prevention, high pressure protection, and defrosting.
Auto mode operation
Describes automatic switching between COOL and HEAT modes.
Auto vane operation
Details the control and function of automatic horizontal vane movement.
Timer operation guide
Procedures for setting and releasing ON/OFF timers.
Program timer operation
Using program timers for combined ON/OFF operations.
Weekly timer operation
Instructions for setting and managing weekly timer schedules.
Night mode operation
Adjusting operation for reduced noise and indicator brightness.
i-save operation
How to set and cancel the i-save energy-saving mode.
Emergency and test operation
Using the emergency switch for test runs or when the remote is unavailable.
3-minute time delay operation
Compressor protection feature preventing immediate restart.
Troubleshooting
Troubleshooting cautions
Important safety and handling precautions before troubleshooting.
Troubleshooting procedure steps
General steps to follow when diagnosing unit malfunctions.
Remote controller battery replacement
Procedure for replacing batteries in the remote controller.
Failure mode recall function
How to recall and interpret stored error codes from the unit.
Instruction for troubleshooting
Flowchart and guidance for diagnosing unit malfunctions.
Wi-Fi interface troubleshooting
Steps to diagnose and resolve issues with the Wi-Fi interface.
Troubleshooting check table
A table correlating indicator lamp patterns with specific fault conditions.
Troubleshooting criteria for main parts
Methods and criteria for checking the resistance of key components.
Indoor fan motor troubleshooting flow
Diagnostic steps for issues related to the indoor fan motor.
Remote controller and indoor PC board check
Procedures for checking the remote controller and the indoor electronic control board.
Indoor PC board and fan motor check
Steps to diagnose issues with the indoor PC board and fan motor.
Checking miswiring and serial signal error
Procedure to identify and resolve miswiring or serial communication errors.
Electromagnetic noise interference
Steps to diagnose and mitigate electromagnetic interference with TVs/radios.
Test point diagram and voltage
Diagrams showing test points and voltage measurements on the control board.
Disassembly Instructions
MSZ-AP15VG/AP20VG disassembly procedures
Procedures for disassembling specific models, starting with panel removal.
Removing indoor electronic control board (MSZ-AP15/20VG)
Detailed steps to remove the main electronic control board and related components.
Removing electrical box (MSZ-AP15/20VG)
Steps to detach and remove the electrical box assembly.
Removing nozzle assembly (MSZ-AP15/20VG)
Procedure for removing the air outlet nozzle assembly.
Removing horizontal vane motor (MSZ-AP15/20VG)
Steps to remove the motor unit responsible for horizontal vane movement.
Removing indoor fan motor and line flow fan (MSZ-AP15/20VG)
Detailed steps for removing the fan motor and fan assembly.
MSZ-AP15VGK/AP20VGK disassembly procedures
Procedures for disassembling specific models, starting with panel removal.
Removing electronic board and Wi-Fi interface (MSZ-AP15/20VGK)
Steps to remove the control board, Wi-Fi module, and related components.
Removing electrical box (MSZ-AP15/20VGK)
Steps to detach and remove the electrical box assembly.
Removing nozzle assembly (MSZ-AP15/20VGK)
Procedure for removing the air outlet nozzle assembly.
Removing horizontal vane motor (MSZ-AP15/20VGK)
Steps to remove the motor unit responsible for horizontal vane movement.
Removing indoor fan motor and line flow fan (MSZ-AP15/20VGK)
Detailed steps for removing the fan motor and fan assembly.
Fixing the indoor coil thermistor
Guidance on how to properly mount the indoor coil thermistor.
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