Mitsubishi Electric MUZ-GE12NA2 User Manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 6
4. OUTLINES AND DIMENSIONS ······················ 10
5. WIRING DIAGRAM ·········································· 13
6. REFRIGERANT SYSTEM DIAGRAM ············· 25
7. DATA ································································ 28
8. ACTUATOR CONTROL ··································· 42
9. SERVICE FUNCTIONS ··································· 43
10. TROUBLESHOOTING ····································· 44
11. DISASSEMBLY INSTRUCTIONS ···················· 64
Models
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
Indoor unit service manual
MSZ-GE•NA MSY-GE•NA Series (OBH548)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH549
REVISED EDITION-F
PARTS CATALOG (OBB549)
Please void OBH549 REVISED EDITION-E.
MUZ-GE09NA/NA2
MUZ-GE12NA/NA2
MUZ-GE15NA, -
1
/NA2
MUZ-GE09NA
MUZ-GE09NA2
MUZ-GE12NA
MUZ-GE12NA2
MUZ-GE15NA,
-
1
MUZ-GE15NA2
MUZ-GE18NA,
-
1
MUZ-GE24NA
Revision F:
• MUZ-GE09/12/15NA2, MUZ-GE09/12/15NAH2
and MUY-GE09/12/15NA2 have been added.
MUZ-GE09NAH
MUZ-GE09NAH2
MUZ-GE12NAH
MUZ-GE12NAH2
MUZ-GE15NAH
MUZ-GE15NAH2
MUZ-GE18NAH
MUY-GE09NA/NA2
MUY-GE12NA/NA2
MUY-GE15NA, -
1
/NA2
TM
MUY-GE18NA,
-
1
MUY-GE24NA
MUY-GE09NA
MUY-GE09NA2
MUY-GE12NA
MUY-GE12NA2
MUY-GE15NA,
-
1
MUY-GE15NA2
MUZ-GE09NAH/NAH2
MUZ-GE12NAH/NAH2
MUZ-GE15NAH/NAH2

Mitsubishi Electric MUZ-GE12NA2 Specifications

General

Brand	Mitsubishi Electric
Model	MUZ-GE12NA2
Category	Air Conditioner
Language	English

Summary

SPECIFICATION

WIRING DIAGRAM

REFRIGERANT SYSTEM DIAGRAM

DATA

ACTUATOR CONTROL

SERVICE FUNCTIONS

TROUBLESHOOTING

Troubleshooting Cautions

Essential safety precautions and initial checks before troubleshooting.

Failure Mode Recall Function

Guide on how to recall and interpret stored error codes from the unit's memory.

Detailed Outdoor Unit Failure Diagnostics

Flow chart for diagnosing outdoor unit abnormalities using failure mode recall.

Outdoor Unit Failure Mode Table

Lists outdoor unit failure modes, LED indicators, conditions, and remedies.

Troubleshooting Check Table

Comprehensive table mapping symptoms to LED indications and troubleshooting steps.

Component Troubleshooting Criteria

Specifies resistance and voltage criteria for testing key components like motors and sensors.

Troubleshooting Flowcharts

Detailed diagnostic flowcharts for various troubleshooting scenarios.

Check Inverter and Compressor

Procedure to check the inverter and compressor for proper function and voltage.

Check Compressor Operation Time

Method to measure compressor operation time before overcurrent shutdown.

Check Compressor Start Failure

Steps to diagnose and resolve compressor start-up failures.

Check Outdoor Thermistors

Procedure for checking the resistance of various outdoor thermistors.

Check Reversing Valve Coil

Check Outdoor Fan Motor

Check Power Supply

Check Expansion Valve (LEV)

Check Inverter P.C. Board

Check Miswiring and Serial Signal Error

Test Point Diagram and Voltage Measurements

DISASSEMBLY INSTRUCTIONS

Removing Inverter Assembly and P.C. Board

Removing Compressor and 4-Way Valve