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Mitsubishi Electric PCA-A24KA - User Manual

Mitsubishi Electric PCA-A24KA
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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

  • M
    Matthew SmithJul 30, 2025
    What to do if Mitsubishi Electric Air Conditioner trouble is not reoccurring and is logged?
    • A
      Alex HunterJul 30, 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.
  • C
    cwardAug 13, 2025
    What to do if Mitsubishi Electric PCA-A24KA Air Conditioner trouble is not reoccurring and is not logged?
    • J
      Jody FarmerAug 13, 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

Safety Precaution

2-1. Always Observe for Safety

Essential safety guidelines to follow before performing maintenance.

2-2. Cautions Related to New Refrigerant

Specific safety precautions for handling R410A refrigerant.

Specifications

4-1. General Unit Specifications

Lists detailed specifications for PCA-A24KA, PCA-A30KA, PCA-A36KA models.

PCA-A42 KA Specifications

Provides detailed specifications for the PCA-A42KA model.

Wiring Diagram

Model-Specific Wiring Diagrams

Provides wiring schematics for different PCA models.

Refrigerant System Diagram

Model-Specific Refrigerant Flow Diagrams

Illustrates refrigerant flow for cooling and heating for different PCA models.

Troubleshooting

9-1. Troubleshooting Summary

9-2. Malfunction Diagnosis by Remote Controller

Procedure for using the remote controller to diagnose malfunctions.

9-3. Self-Diagnosis Action Table

Table detailing error codes, causes, and countermeasures for self-diagnosis.

9-4. Troubleshooting by Inferior Phenomena

Guides troubleshooting for issues not indicated by specific error codes.

9-5. Emergency Operation

Instructions for operating the unit in emergency mode when controls fail.

9-6. How to Check the Parts

Methods for testing key components like thermistors and motors.

Disassembly Procedure

1. Removing the Air Intake Grille

2. Removing Indoor Controller and Electrical Box

3. Removing Room Temperature Thermistor (TH1)

4. Removing Fan Motor and Side Fan

5. Removing the Fan

6. Removing the Side Panel

7. Removing the Vane Motor

8. Removing the Under Panel

9. Removing the Drain Pan

10. Removing Thermistors and Pipe Cover

11. Removing the Guide Vane

12. Removing the Auto Vane

13. Removing the Heat Exchanger

Mitsubishi Electric PCA-A24KA Specifications

General IconGeneral
BrandMitsubishi Electric
ModelPCA-A24KA
CategoryAir Conditioner
LanguageEnglish

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