Mitsubishi Electric PCA-A42KA - User Manual

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SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SPLIT-TYPE, AIR CONDITIONERS

No. OCH455

INDOOR UNIT

REMOTE CONTROLLER

CONTENTS

1. REFERENCE MANUAL

...................................

2

2. SAFETY PRECAUTION

...................................

3

3. PART NAMES AND FUNCTIONS

....................

4

4. SPECIFICATIONS

............................................

6

5. NOISE CRITERION CURVES

..........................

8

6. OUTLINES AND DIMENSIONS

.......................

9

7. WIRING DIAGRAM

.........................................

11

8. REFRIGERANT SYSTEM DIAGRA

.............

12

9. TROUBLESHOOTING

...................................

13

10. SPECIAL FUNCTION

.....................................

28

11. DISASSEMBLY PROCEDURE

.......................

31

ON/OFF

TEMP.

Indoor unit

[Model names] [Service Ref.]

PCA-A24KA

PCA-A24KA

PCA-A30KA

PCA-A30KA

PCA-A36KA

PCA-A36KA

PCA-A42KA

PCA-A42KA

March 2009

NOTE:

• This manual describes only

service data of the indoor

units.

• RoHS compliant products

have <G> mark on the

spec name plate.

PARTS CATALOG (OCB455)

Model name

indication

Table of Contents

Questions and Answers

K
kayla61Aug 5, 2025
What to do if Mitsubishi Electric PCA-A42KA Air Conditioner trouble is not reoccurring and is logged?
- T
  Tommy GillespieAug 5, 2025
  If the trouble with your Mitsubishi Electric Air Conditioner isn't happening consistently but is recorded in the system, it might be due to temporary issues. This includes activation of protection devices in the refrigerant circuit (including compressor), loose wiring, or electrical noise. To address this, re-examine the specific issue, and inspect the installation area, refrigerant levels, weather conditions at the time of the problem, and wiring. After servicing, clear the error code history and restart the unit. This indicates that the electrical components, controller board, and remote controller are likely functioning correctly.
B
brooksdustinAug 21, 2025
What to do if Mitsubishi Electric PCA-A42KA trouble is not reoccurring and is not logged?
- K
  kevinhernandezAug 21, 2025
  If the issue with your Mitsubishi Electric Air Conditioner is not consistently happening and isn't being recorded, re-examine the specific abnormal symptom. Troubleshoot and identify the cause of the problem according to “9-4. Troubleshooting by inferior phenomena”. If you can't find the cause, continue to operate the unit for the time being. This suggests that parts like the electrical components, controller board, and remote controller are working as expected.

Summary

REFERENCE MANUAL

Outdoor Unit Service Manuals

Lists service manuals for various outdoor unit models.

Technical Data Books

Provides a list of technical data books for indoor units.

SAFETY PRECAUTION

General Safety Practices

Essential safety guidelines and precautions to observe during operation and maintenance.

New Refrigerant R410 A Safety

Specific safety measures and cautions for using R410A refrigerant.

PART NAMES AND FUNCTIONS

Indoor Unit Components Overview

Identifies and illustrates the main components of the indoor unit.

SPECIFICATIONS

Model Specifications

Detailed technical specifications for PCA-A24KA, PCA-A30KA, PCA-A36KA, and PCA-A42KA models.

NOISE CRITERION CURVES

OUTLINES AND DIMENSIONS

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

TROUBLESHOOTING

Troubleshooting Summary

Overview of error code display, self-diagnosis, and actions for service.

Malfunction Diagnosis via Remote Controller

Procedure for initiating and interpreting malfunction diagnosis using the remote controller.

Self-Diagnosis Action Table

Table detailing error codes, their causes, and recommended countermeasures.

Troubleshooting Inferior Phenomena

Guidance for resolving operational issues and abnormal phenomena not covered by error codes.

Emergency Operation Modes

Instructions for activating and using emergency operational modes.

Component Checking Procedures

Methods for testing specific parts like thermistors, motors, and switches.

Test Point Diagram

Illustrates test points on the indoor controller board for diagnostics.

DIP Switch and Jumper Wire Functions

Explains the functions and settings of DIP switches and jumper wires.

SPECIAL FUNCTION

Rotation and Cut-in Functions

Details on rotation, backup, and second stage cut-in operational functions.

Back-up Heating Function

Information on the back-up heating feature's operation and connection.

DISASSEMBLY PROCEDURE

Remove Air Intake Grille

Steps for safely removing the air intake grille from the unit.

Remove Controller Board and Electrical Box

Procedure for detaching the indoor controller board and electrical box.

Remove Room Temperature Thermistor

Instructions for disassembling and removing the room temperature thermistor.

Remove Fan Motor and Right Side Fan

Steps to detach the fan motor and the associated right side fan.

Remove Fan Assembly

Procedure for removing the complete fan and shaft assembly.

Remove Side Panel

Instructions for detaching and removing the side panel of the unit.

Remove Vane Motor

Steps for disassembling and removing the vane motor.

Remove Under Panel

Procedure for removing the unit's under panel.

Remove Drain Pan

Steps for safely removing the internal drain pan.

Remove Thermistors and Pipe Cover

Instructions for detaching thermistors and pipe covers.

Remove Guide Vane

Steps for removing the guide vane assembly.

Remove Auto Vane

Steps for detaching the auto vane mechanism.

Remove Heat Exchanger

Instructions for disassembling and removing the heat exchanger.

Mitsubishi Electric PCA-A42KA Specifications

General

Brand	Mitsubishi Electric
Model	PCA-A42KA
Category	Air Conditioner
Language	English

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