Mitsubishi Electric PSA-M125KA-ET User Manual

SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
[Service Ref.]
PSA-M71KA
PSA-M100KA
PSA-M125KA
PSA-M140KA
PSA-M71KA-ER
PSA-M100KA-ER
PSA-M125KA-ER
PSA-M140KA-ER
PSA-M71KA-ET
PSA-M100KA-ET
PSA-M125KA-ET
PSA-M140KA-ET
September 2021
R32/R410A
Notes:
• This manual describes only
service data of the indoor
units.
PARTS CATALOG (OCB724)
Model name
indication
No. OCH724
CONTENTS
1. REFERENCE MANUAL ·······················2
2. SAFETY PRECAUTION ·······················2
3. PARTS NAMES AND FUNCTIONS ········9
4. SPECIFICATIONS ···························· 10
5. NOISE CRITERION CURVES ············· 12
6. OUTLINES AND DIMENSIONS ··········· 13
7. WIRING DIAGRAM ··························· 14
8. REFRIGERANT SYSTEM DIAGRAM ··· 15
9. TROUBLESHOOTING ······················· 16
10. SPECIAL FUNCTION ························ 27
11. DISASSEMBLY PROCEDURE ············ 29
12. REMOTE CONTROLLER ··················· 34
Indoor unit
[Model Name]
PSA-M71KA
PSA-M100KA
PSA-M125KA
PSA-M140KA
PSA-M71KA-ER
PSA-M100KA-ER
PSA-M125KA-ER
PSA-M140KA-ER
PSA-M71KA-ET
PSA-M100KA-ET
PSA-M125KA-ET
PSA-M140KA-ET

Mitsubishi Electric PSA-M125KA-ET Specifications

General

Brand	Mitsubishi Electric
Model	PSA-M125KA-ET
Category	Air Conditioner
Language	English

Summary

REFERENCE MANUAL

SAFETY PRECAUTIONS

General Safety Guidelines

Essential safety guidelines to follow before and during operation.

Refrigerant Handling Cautions

Specific safety measures and handling procedures for refrigerants.

Service Safety Protocols

Warnings and precautions for service personnel, including unit alteration and refrigerant handling.

R32 Refrigerant Specific Safety

Safety procedures specific to R32 refrigerant, emphasizing ignition risks and controlled work environments.

Service Tools

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

TROUBLESHOOTING

Troubleshooting Overview

Summarizes troubleshooting steps based on recurring or non-recurring issues and check codes.

Malfunction Diagnosis via Remote Controller

Explains how to use the remote controller to diagnose malfunctions and check error history.

Self-Diagnosis Action Table

Detailed table linking check codes to causes and countermeasures for specific unit problems.

Troubleshooting by Inferior Phenomena

Addresses common issues and provides troubleshooting steps for abnormal unit behavior or component failures.

FUNCTIONS OF DIP SWITCH AND JUMPER WIRE

SPECIAL FUNCTION

Rotation and Backup Functions

Describes how to set up rotation and backup operations for multiple indoor units.

DISASSEMBLY PROCEDURE

REMOTE CONTROLLER OPERATIONS

REMOTE CONTROLLER ADVANCED OPERATIONS

ERROR HANDLING AND DIAGNOSTICS

Error Information Display and Reset

How to view and reset error codes displayed on the remote controller.

Service Menu and Password Entry

Accessing the service menu and procedures for password entry and reset.

Test Run Procedures

Function Setting Procedures

Error and Preliminary Error History

Self-Diagnosis Procedures

Remote Controller Check Function