Mitsubishi Electric Trane NTXWPH12B112AA User Manual

INDOOR UNIT
SERVICE MANUAL
INDOOR UNIT
No. OBHT872
PARTS CATALOG (OBBT872)
Outdoor unit service manual
NTXSPB/SPH∙B112AA Series (OBHT873)
NTXMMX/MPH∙A122AA Series (OBHT702)
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················4
3. SPECIFICATION ·········································5
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············8
7. SERVICE FUNCTIONS ································9
8. MICROPROCESSOR CONTROL ················· 11
9. TROUBLESHOOTING ······························· 20
10. DISASSEMBLY INSTRUCTIONS ·················33
Models
NTXWPH06B112AA
NTXWPH09B112AA
NTXWPH12B112AA
NTXWPH15B112AA
NTXWPH18B112AA

Mitsubishi Electric Trane NTXWPH12B112AA Specifications

General

Category	Air Conditioner
Model	NTXWPH12B112AA
Cooling Capacity	12, 000 BTU/h
Heating Capacity	13, 000 BTU/h
HSPF Rating	10.0
Voltage	208/230 V
Phase	1
Refrigerant	R-410A
Indoor Unit Noise Level	19 dB
Outdoor Unit Dimensions (HxWxD)	31.5 x 12.4 inches

Summary

Specifications

Operating Range

Details power supply requirements and operational temperature/humidity ranges.

Wiring Diagram

Refrigerant System Diagram

Service Functions

Microprocessor Control

Wireless Remote Controller

Details the functions and buttons of the wireless remote controller.

Timer Operation

Instructions for setting and using the ON/OFF timer functions.

Weekly Timer Operation

Guides on setting up daily and weekly timer schedules.

Troubleshooting

Cautions on Troubleshooting

Essential safety precautions and preparation steps before troubleshooting.

Failure Mode Recall Function

How to recall and clear memorized error codes and abnormalities.

Indoor Unit Failure Mode Table

Lists indoor unit failure codes, conditions, and remedies.

Instruction of Troubleshooting

General troubleshooting flowchart for diagnosing unit issues.

Troubleshooting Check Table

A table correlating symptoms with causes and recommended remedies.

Trouble Criterion of Main Parts

Provides resistance criteria for checking key components.

Troubleshooting Flow: Indoor Fan Motor

Check Remote Controller and Indoor P.C. Board

Diagnosing issues with the remote controller and indoor electronic board.

Check Indoor P.C. Board and Fan Motor

Procedure for checking the indoor P.C. board and fan motor.

Check Miswiring and Serial Signal Error

Test Point Diagram and Voltage

Diagrams showing test points and voltage references on PCBs.

Disassembly Instructions

Removing Boards and Assemblies