Mitsubishi Electric TRANE NTXCKS12A112AA - User Manual

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Indoor unit

[Model Name]

NTXCKS09A112AA

NTXCKS12A112AA

NTXCKS15A112AA

NTXCKS18A112AA

TECHNICAL & SERVICE MANUAL

No. OCHT669

CONTENTS

1. REFERENCE MANUAL

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2. SAFETY PRECAUTION ......................2

3. PARTS NAMES AND FUNCTIONS

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4. SPECIFICATIONS

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5. OUTLINES AND DIMENSIONS

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6. WIRING DIAGRAM

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REFRIGERANT SYSTEM DIAGRAM

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8. TROUBLESHOOTING

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

9. SPECIAL FUNCTION

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10. 4-WAY AIRFLOW SYSTEM

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

11. DISASSEMBLY PROCEDURE

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INDOOR UNIT

Model name

indication

WIRED REMOTE CONTROLLER

(Option)

PARTS CATALOG (OCBT669)

WIRELESS REMOTE

CONTROLLER

(Option)

November 2018

Main Page

Questions and Answers

M
Monica BarnettAug 7, 2025
What to do if the Mitsubishi Electric TRANE NTXCKS12A112AA trouble is not reoccurring but is logged?
- D
  Douglas SpencerAug 7, 2025
  Consider temporary defects such as the operation of protection devices in the refrigerant circuit including the compressor, poor wiring connections, or noise. Re-check the symptom, and inspect the installation environment, refrigerant amount, weather conditions when the trouble occurred, and wiring. After finishing service, reset check code logs and restart the unit. Note that there may be no abnormality in the electrical components, controller board, or remote controller.
Y
Yolanda SanchezAug 21, 2025
What to do if Mitsubishi Electric TRANE NTXCKS12A112AA trouble is not reoccurring and not logged?
- C
  christopher47Aug 21, 2025
  Re-check the abnormal symptom. If the cause is not ascertained, continue to operate the unit for the time being. Note that there is no abnormality concerning parts such as electrical components, controller board, and remote controller.

Summary

Manual Introduction and Safety Guidelines

R410 A Refrigerant Safety and Handling

Details essential safety measures, tool requirements, and handling procedures for R410A refrigerant systems.

Component Identification and Controller Operations

Indoor Unit Parts Identification

Identifies and describes the components of the indoor unit, including air outlets, filters, and grilles.

Wireless Remote Controller Functions

Wired Remote Controller Interface

Technical Specifications and Noise Characteristics

Refrigerant System and Troubleshooting Guide

Refrigerant System Diagram

Diagram showing the refrigerant flow path and key components within the system.

Troubleshooting Summary by Check Code

Summarizes actions for recurring and non-recurring troubles based on self-diagnosis check codes.

Remote Controller Malfunction Diagnosis

Details the self-check procedure using the remote controller to diagnose malfunctions.

Indoor Unit Self-Diagnosis Actions

Provides a table linking check codes to causes and countermeasures for indoor unit abnormalities.

Troubleshooting LED Indicators and Problems

Lists common phenomena related to indoor controller board LEDs and their corresponding causes and countermeasures.

Component Testing, Configuration, and Troubleshooting

Indoor Controller Board Test Points

Main Parts Troubleshooting and Thermistor Data

Details troubleshooting for main parts, including thermistor characteristics and DC fan motor checks.

Disassembly and Component Removal Procedures

Unit Panel and Electrical Parts Removal

Fan Motor and Heat Exchanger Removal

Drain Pump and Float Switch Removal

Heat Exchanger Assembly Removal

Mitsubishi Electric TRANE NTXCKS12A112AA Specifications

General

Category	Air Conditioner
Brand	Mitsubishi Electric TRANE
Model	NTXCKS12A112AA
Refrigerant	R410A
Cooling Capacity	12000 BTU/h
Heating Seasonal Performance Factor (HSPF)	10.0
Power Supply	208/230V, 1Ph, 60Hz
Operating Temperature (Cooling)	115°F
Operating Temperature (Heating)	75°F
Outdoor Unit Dimensions (H x W x D)	31.5