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INDOOR UNIT
SERVICE MANUAL
Models
MSZ-EF09NAW -
MSZ-EF15NAW -
MSZ-EF09NAB -
MSZ-EF15NAB -
MSZ-EF09NAS -
MSZ-EF15NAS -
MSZ-EF12NAW -
U1
MSZ-EF18NAW -
U1
MSZ-EF12NAB -
U1
MSZ-EF18NAB -
U1
MSZ-EF12NAS -
U1
MSZ-EF18NAS -
U1
Outdoor unit service manual
MXZ- ∙C∙NA(HZ) Series (OCH573)
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············8
7. SERVICE FUNCTIONS ································9
8. MICROPROCESSOR CONTROL ················ 11
9. TROUBLESHOOTING ······························· 19
10. DISASSEMBLY INSTRUCTIONS ················· 31
PARTS CATALOG (OBB736)
Revision A:
• 4. OUTLINES AND DIMENTIONS has been
modified.
• Some descriptions have been modified.
OBH736 is void.
No. OBH736
REVISED EDITION-A
U1
U1
U1
U1
U1
U1
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Table of Contents
Related Manuals for Mitsubishi MSZ-EF09NAW
Summarization of Contents
Technical Changes and Model Information
New Model Introduction
Details about the introduction of a new model and modifications to the service manual.
Part Names and Functions
Included Accessories
Lists and describes the accessories provided with the indoor unit for installation and operation.
Specifications and Operating Ranges
Operating Range Details
Specifies the operating conditions, voltage, and temperature ranges for the indoor unit.
Service Functions
Timer Short Mode Configuration
Describes how to shorten timer settings for service purposes on the control board.
Remote Controller Pairing Procedure
Explains how to set a remote controller exclusively for a particular indoor unit.
Microprocessor Control Features
Wireless Remote Controller Overview
Explains the functions and buttons of the wireless remote controller and indicator lamps.
Unit Operation Modes
Details COOL, DRY, FAN, and HEAT operation modes and their specific controls.
Auto Mode and Vane Control Features
Explains AUTO mode switching, horizontal vane control, and its various settings.
Timer and Scheduling Functions
Guides on setting ON/OFF, program, and weekly timers for automated operation.
Advanced Operations (Smart Set, Emergency)
Covers advanced features like Smart Set, emergency test run, and time delay operations.
Troubleshooting Guide
Cautions and Battery Replacement
Important safety precautions and instructions for replacing remote controller batteries.
Failure Recall and Unit Error Tables
Procedures for recalling error codes and understanding unit failure mode tables.
Troubleshooting Flowcharts and Checks
Step-by-step guides and flowcharts for diagnosing unit malfunctions.
Component Specific Troubleshooting
Detailed checks for fan motors, P.C. boards, wiring, and signals.
Electrical Troubleshooting and Test Points
Guides for electrical checks, including test point diagrams and voltage measurements.
Disassembly Instructions
Panel and Electrical Box Removal
Steps to remove the front panel and electrical boxes.
Component Removal (Motors, Heat Exchanger)
Procedures for removing vane motors, fan motors, and the heat exchanger.
Indoor Coil Thermistor Installation
Guidance on correctly installing the indoor coil thermistor.
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