Mitsubishi Electric Mr.Slim MSZ-GC25NA - C1 User Manual

SERVICE MANUAL
CONTENTS
1. PART NAMES AND FUNCTIONS ····················· 3
2. SPECIFICATION ················································ 4
3. OUTLINES AND DIMENSIONS ························ 5
4. WIRING DIAGRAM ············································ 7
5. REFRIGERANT SYSTEM DIAGRAM ··············· 9
6. SERVICE FUNCTIONS ··································· 10
7. MICROPROCESSOR CONTROL ··················· 12
8. TROUBLESHOOTING ····································· 18
9. DISASSEMBLY INSTRUCTIONS ···················· 39
Models
MSZ-GC22NA -
C1
MSZ-GC25NA -
C1
MSZ-GC35NA -
C1
MSZ-GC35NA -
C2
MSZ-GC50NA -
C1
MSZ-GC60NA -
C1
MSZ-GC71NA -
C1
SPLIT-TYPE AIR CONDITIONERS
MSZ-GC22/25/35NA
INDOOR UNIT
Outdoor unit service manual
MUZ-GC·NA Series(OBH482)
MXZ-A·NA Series (OB430)
PARTS CATALOG (OBB481)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
No. OBH481
REVISED EDITION-A
Please void OBH481.
Revision A:
• MSZ-GC35NA -
C2
has been added.

Mitsubishi Electric Mr.Slim MSZ-GC25NA - C1 Specifications

General

Cooling Capacity	2.5 kW
Heating Capacity	3.2 kW
Power Supply	220-240 V, 50 Hz
Refrigerant	R410A
Weight (Indoor Unit)	9 kg
Power Supply (V, Hz)	220-240 V, 50 Hz
Indoor Unit Weight (lbs)	19.8 lbs
Refrigerant Type	R410A

Summary

2. Specification

4. Wiring Diagram

6. Service Functions

7. Microprocessor Control

Wireless Remote Controller Overview

Details functions and buttons of the wireless remote controller.

Cool Operation

Explains cooling mode operation and coil frost prevention.

Heat Operation

Explains heat mode, cold air prevention, and defrosting.

Auto Changeover Mode Operation

Describes automatic switching between COOL and HEAT modes.

Auto Vane Operation

7-7. Emergency/Test Operation

8. Troubleshooting

Cautions on Troubleshooting

Troubleshooting Procedure

General steps for diagnosing and resolving abnormalities.

8-2. Failure Mode Recall Function

Failure Mode Recall Flowchart

Flowchart for using the failure mode recall function.

Indoor Unit Failure Mode Table

Table correlating indicator patterns to specific indoor unit failures.

8-3. Instruction of Troubleshooting

8-4. Troubleshooting Check Table

8-5. Trouble Criterion of Main Parts

8-6. Troubleshooting Flow

Check of Indoor Fan Motor

Flowchart for diagnosing indoor fan motor errors.

B. Check of Remote Controller and Indoor P.C. Board

C. Check of Indoor P.C. Board and Indoor Fan Motor

D. How to Check Miswiring and Serial Signal Error

8-7. Test Point Diagram and Voltage

Indoor Power P.C. Board and Terminal P.C. Board

Diagrams and voltage test points for power/terminal P.C. boards.

Indoor Electronic Control P.C. Board

Diagram and test points for the indoor electronic control P.C. board.

9. Disassembly Instructions

Disassembly for MSZ-GC22/25/35NA Models

Instructions for disassembling specific indoor unit models.

Removing the Panel

Removing Indoor Control P.C. Board & Thermistor

Removing Indoor Power P.C. Board, Terminal P.C. Board, and Electrical Box

Removing the Vane Motor

Removing Fan Motor, Coil Thermistor, and Line Flow Fan

Disassembly for MSZ-GC50NA Model

Steps for disassembling the MSZ-GC50NA model panel.

Removing the Panel (MSZ-GC50NA)

Removing Electronic Control, Receiver, and Display P.C. Boards

Removing the Electrical Box

Removing the Horizontal Vane Motor Unit

Removing Fan Motor and Line Flow Fan

Disassembly for MSZ-GC60/71NA Models

Instructions for disassembling GC60/71 models.

Removing the Front Panel (MSZ-GC60/71NA)

Removing Electronic Control, Receiver, and Display P.C. Boards (MSZ-GC60/71NA)

Removing the Electrical Box (MSZ-GC60/71NA)

Removing the Vane Motor (MSZ-GC60/71NA)

Removing Fan Motor and Line Flow Fan (MSZ-GC60/71NA)