Mitsubishi Electric TRANE NTXWST18A112AA User Manual

CONTENTS
1. TECHNICAL CHANGES
·······································
2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 6
4. OUTLINES AND DIMENSIONS ························ 8
5. WIRING DIAGRAM ·········································· 10
6. REFRIGERANT SYSTEM DIAGRAM ············· 12
7. SERVICE FUNCTIONS ··································· 13
8. MICROPROCESSOR CONTROL ··················· 15
9. TROUBLESHOOTING ····································· 23
10. DISASSEMBLY INSTRUCTIONS ···················· 41
Outdoor unit service manual
NTXSST•A112AA, NTYSST•A112AA Series (OBHT733)
NTXMMX•A•AA, NTXMPH•A•AA Series (OCHT573)
PARTS CATALOG (OBBT732)
NTXWST18A112AA
NTYWST18A112AA
INDOOR UNIT
SERVICE MANUAL
INDOOR UNIT
Models
NTXWST06A112AA
NTXWST09A112AA NTYWST09A112AA
NTXWST12A112AA NTYWST12A112AA
NTXWST15A112AA NTYWST15A112AA
NTXWST18A112AA NTYWST18A112AA
NTXWST24A112AA NTYWST24A112AA
No. OBHT732

Mitsubishi Electric TRANE NTXWST18A112AA Specifications

General

Brand	Mitsubishi Electric
Model	TRANE NTXWST18A112AA
Category	Air Conditioner
Language	English

Summary

TECHNICAL CHANGES

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

MICROPROCESSOR CONTROL

8-1. COOL OPERATION

Details the operation procedures and features for COOL mode.

8-2. DRY OPERATION

Details the operation procedures and features for DRY mode.

8-3. HEAT OPERATION

Details the operation procedures and features for HEAT mode.

8-5. "I FEEL CONTROL” OPERATION

8-8. TIMER OPERATION

8-10. EMERGENCY/TEST OPERATION

Explains how to perform emergency and test run operations.

TROUBLESHOOTING

9-1. CAUTIONS ON TROUBLESHOOTING

Important safety and preliminary checks before troubleshooting.

9-2. FAILURE MODE RECALL FUNCTION

Procedure to recall and interpret error codes from the unit's memory.

9-3. INSTRUCTION OF TROUBLESHOOTING

A flowchart guiding the user through troubleshooting steps based on symptoms.

9-4. TROUBLESHOOTING CHECK TABLE

A table correlating operation indicator lamp patterns with abnormal points and remedies.

9-5. TROUBLE CRITERION OF MAIN PARTS

Details resistance checks for key components like thermistors and motors.

9-6. TROUBLESHOOTING FLOW

Step-by-step diagnostic flowcharts for specific component failures.

B Check of remote controller and indoor electronic control P.C. board

C Check of indoor P.C. board and indoor fan motor

D How to check miswiring and serial signal error

9-7. TEST POINT DIAGRAM AND VOLTAGE

Provides detailed diagrams and voltage measurements for diagnosing electronic components.