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Mitsubishi Electric PKA-A18HAL - User Manual

Mitsubishi Electric PKA-A18HAL
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SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
NOTE:
• This manual describes
only service data of the
indoor units.
• RoHS compliant products
have <G> mark on the
spec name plate.
CONTENTS
1. REFERENCE MANUAL
...................................
2
2. SAFETY PRECAUTION
...................................
3
3. PART NAMES AND FUNCTIONS
...................
4
4. SPECIFICATIONS
............................................
7
5. NOISE CRITERION CURVES
..........................
8
6. OUTLINES AND DIMENSIONS
.......................
9
7. WIRING DIAGRAM
.........................................10
8. REFRIGERANT SYSTEM DIAGRAM
............
11
9. TROUBLESHOOTING
....................................
12
10. SPECIAL FUNCTION
.....................................
27
11. DISASSEMBLY PROCEDURE
.......................
30
Indoor unit
[Model names] [Service Ref.]
PARTS CATALOG (OCB456)
No. OCH456
March 2009
INDOOR UNIT
PKA-A12HA
PKA-A12HA
PKA-A18HA
PKA-A18HA
PKA-A12HAL
PKA-A12HAL
PKA-A18HAL
PKA-A18HAL
ON/OFF
TEMP.
COOL
DRY
AUTO
FAN
HEAT
3 3 2 2 3
WIRED REMOTE
CONTROLLER
WIRELESS REMOTE
CONTROLLER

Table of Contents

Questions and Answers

  • D
    dsmithAug 5, 2025
    What to do if the trouble is not reoccurring and is logged in Mitsubishi Electric PKA-A18HAL?
    • J
      jenna75Aug 5, 2025
      If a logged trouble with your Mitsubishi Electric Air Conditioner is not reoccurring, it might be due to temporary defects such as protection devices in the refrigerant circuit including compressor, poor wiring connections or noise. Re-check the symptom, installation environment, refrigerant amount and weather conditions when the issue occurred, as well as wiring. After servicing, reset the error code logs and restart the unit. This indicates no abnormality in the electrical components, controller board, or remote controller.
  • J
    James FlemingAug 20, 2025
    What to do if trouble is not reoccurring and is not logged in Mitsubishi Electric Air Conditioner?
    • R
      Roberta DavisAug 21, 2025
      If a trouble with your Mitsubishi Electric Air Conditioner is not reoccurring and is not logged, re-check the abnormal symptom. Conduct troubleshooting and find the cause of the trouble according to the troubleshooting guide for inferior phenomena. If the cause is not found, continue to operate the unit for the time being. This indicates that there is no abnormality concerning parts such as the electrical component, controller board, or remote controller.

Summary

REFERENCE MANUAL

OUTDOOR UNIT SERVICE MANUAL

Lists service manual references for outdoor units.

TECHNICAL DATA BOOK

Lists technical data book references.

SAFETY PRECAUTION

General Safety Observance

General safety guidelines to follow before servicing.

R410 A Refrigerant Handling Cautions

Specific precautions for handling R410A refrigerant.

PART NAMES AND FUNCTIONS

Indoor Unit Components Identification

Identifies and describes the parts of the indoor unit.

SPECIFICATIONS

PKA-A12 HA;A12 HAL Indoor Unit Specs

Technical specifications for PKA-A12HA and PKA-A12HAL indoor units.

PKA-A18 HA;A18 HAL Indoor Unit Specs

Technical specifications for PKA-A18HA and PKA-A18HAL indoor units.

NOISE CRITERION CURVES

OUTLINES AND DIMENSIONS

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

TROUBLESHOOTING

Troubleshooting Summary and Self-Diagnosis

Summary of error code display and basic troubleshooting actions.

Malfunction Diagnosis via Remote Controller

Procedure to diagnose malfunctions using the remote controller.

Error Codes for Indoor;Outdoor Units

Lists various error codes detected by indoor and outdoor units.

Troubleshooting by Unit Phenomena

Troubleshooting based on unit behavior and indicator lights.

SPECIAL FUNCTION

Rotation & Back-up Function Operation

How main and sub units operate alternately for backup.

2 nd Stage Cut-in Function Operation

Operation of a second unit for increased capacity.

Setting Rotation & Cut-in Functions

Method to set rotation and cut-in functions via wired remote controller.

DISASSEMBLY PROCEDURE

Removing Front Panel and Electrical Box

Steps for removing the front panel and electrical box.

Removing Internal Components

Steps for removing controller boards, fan motor, vane motor, thermistors, and heat exchanger.

Mitsubishi Electric PKA-A18HAL Specifications

General IconGeneral
Cooling Capacity5.0 kW
Power Supply220-240V, 50Hz
RefrigerantR32
Weight (Indoor Unit)9 kg
Weight (Outdoor Unit)30 kg
TypeAir Conditioner
Outdoor Unit Dimensions (W x H x D)780 x 540 x 269 mm
Operating Temperature (Heating)-15°C to 24°C

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