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SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Models
MSZ-SF15VA -
MSZ-SF20VA -
MSZ-SF20VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision A:
• MSZ-SF15VA-
been added.
Please void OBH555.
E1
,
E2
,
E1
E2
Outdoor unit service manual
MXZ-B·VA Series (OBH554)
MXZ-C·VA Series (OBH584)
MXZ-D·VA Series (OBH626)
MXZ-8A·VA (OC316)
MXZ-8B·VA (OCH480)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 6
6. WIRING DIAGRAM ············································ 7
7. REFRIGERANT SYSTEM DIAGRAM ··············· 8
8. SERVICE FUNCTIONS ····································· 9
9. MICROPROCESSOR CONTROL ····················11
10. TROUBLESHOOTING ····································· 17
11. DISASSEMBLY INSTRUCTIONS ···················· 29
PARTS CATALOG (OBB555)
and MSZ-SF20VA-
have
E2
E2
No. OBH555
REVISED EDITION-A
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MXZ-8A VA Series
Summarization of Contents
Part Names and Functions
Accessories
Lists all included accessories with their quantity.
Service Functions
Timer Short Mode
Shortens timer setting for service purposes.
P.C. Board Modification for Individual Operation
Modifying the remote controller P.C. board for individual unit operation.
Auto Restart Function
Manages automatic unit restart after power interruptions.
Microprocessor Control
Wireless Remote Controller
Details the functions and buttons of the wireless remote controller.
Indoor Unit Display Section
Explains the operation indicator lamp states and their meanings.
Cool Operation
Describes how to perform cooling operation and its features.
Dry Operation
Details the dry mode operation, including frost prevention.
Heat Operation
Explains heat mode operation, cold air prevention, and defrosting.
Auto Change Over ... Auto Mode Operation
Describes how the unit automatically switches between COOL and HEAT modes.
Auto Vane Operation
Explains the automatic control and operation of the horizontal vane.
Timer Operation
Covers setting the current time and programming ON/OFF timers.
Weekly Timer Operation
Details how to set individual ON/OFF timers for each day of the week.
i-save Operation
Describes how to set and cancel the i-save operation for personalized settings.
Emergency/Test Operation
Explains the use of the emergency operation switch for testing or emergencies.
3-Minute Time Delay Operation
Explains the compressor protection feature preventing immediate restarts.
Troubleshooting
Cautions on Troubleshooting
Important precautions and checks before performing troubleshooting.
Failure Mode Recall Function
How to recall and interpret past error codes recorded by the unit.
Instruction of Troubleshooting
A step-by-step guide and flowchart for diagnosing problems.
Troubleshooting Check Table
A table listing symptoms, conditions, and remedies for various faults.
Trouble Criterion of Main Parts
How to check the functionality and resistance of key components.
Troubleshooting Flow
Detailed flowchart for diagnosing indoor fan motor issues.
Check of Remote Controller and Indoor Electronic Control P.C. Board
Steps to check the remote controller and indoor electronic control board for issues.
Check of Indoor P.C. Board and Indoor Fan Motor
Procedures to check the indoor P.C. board and fan motor for faults.
How to Check Miswiring and Serial Signal Error
Guide to diagnose and resolve miswiring and serial signal communication errors.
Test Point Diagram and Voltage
Diagrams and voltage points for testing components on the indoor electronic control P.C. board.
Disassembly Instructions
Removing the Panel
Step-by-step guide to remove the front panel of the indoor unit.
Removing the Indoor Electronic Control P.C. Board, Receiver P.C. Board, Display P.C. Board, and SW P.C. Board
Instructions for removing various internal circuit boards.
Removing the Electrical Box
Steps to remove the electrical box containing P.C. boards.
Removing the Nozzle Assembly
Procedure for removing the nozzle assembly.
Removing the Horizontal Vane Motor
Guide to remove the horizontal vane motor unit.
Removing the Indoor Fan Motor and the Line Flow Fan
Instructions for removing the indoor fan motor and line flow fan.
Need help?
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Questions and answers