MSZ-GS and MSY-GS Series - Indoor Unit OBH874 Revised Edition-A Service Manual

Oct 22, 2026

Service manual revision A for the indoor units with the OBH874 revised edition-A reference, covering MSZ-GS06/09/12/15/18/24/30/36NA series and MSY-GS counterparts, including GS30NA2/GS36NA2 variants. Documents technical changes, part names and functions, specifications, outlines and dimensions, wiring and refrigerant system diagrams, service functions, microprocessor control, troubleshooting, and disassembly instructions. Includes accessories lists, detailed repair precautions and electrical safety steps, and refrigerant handling rules stating the specified refrigerant only.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages74

Reading Time3 h 6 min

AccessFree to download

Technical Changes

Part Names and Functions

Specification

Outlines and Dimensions

Wiring Diagram

Refrigerant System Diagram

Service Functions

Microprocessor Control

Troubleshooting

Disassembly Instructions

Parts Catalog

Revision A: • MSZ-GS06/09/12/15/18/24NA- U1 , MSY-GS09/12/15/18/24NA- U1 , MSZ-GS30/36NA2- U1 and MSY-GS30/36NA2- U1 have been added. OBH874 is void. INDOOR UNIT No. OBH874 REVISED EDITION-A SERVICE MANUAL Models MSZ-GS06NA - U1 MSY-GS09NA - U1 MSZ-GS09NA - U1 MSY-GS12NA - U1 MSZ-GS12NA - U1 MSY-GS15NA - U1 MSZ-GS15NA - U1 MSY-GS18NA - U1 MSZ-GS18NA - U1 MSY-GS24NA - U1 MSZ-GS24NA - U1 MSY-GS30NA - U1 MSZ-GS30NA - U1 MSY-GS30NA2 - U1 MSZ-GS30NA2 - U1 MSY-GS36NA - U1 MSZ-GS36NA - U1 MSY-GS36NA2 - U1 MSZ-GS36NA2 - U1 Outdoor unit service manual MUZ-GS•NA/NAH, MUY-GS•NA Series (OBH875) MXZ-C•NA, MXZ-C•NAHZ Series (OCH573) CONTENTS 1. TECHNICAL CHANGES ······························2 2. PART NAMES AND FUNCTIONS ··················3 3. SPECIFICATION ········································7 4. OUTLINES AND DIMENSIONS ··················· 10 5. WIRING DIAGRAM ··································· 12 6. REFRIGERANT SYSTEM DIAGRAM ··········· 15 MSZ-GS18NA MSY-GS18NA 7. SERVICE FUNCTIONS ······························ 17 8. MICROPROCESSOR CONTROL·················20 9. TROUBLESHOOTING ·······························34 10. DISASSEMBLY INSTRUCTIONS·················59 PARTS CATALOG (OBB874) | Use the specified refrigerant only | | --- | | Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. | Prepare the proper tools. Prepare the proper protectors. Provide adequate ventilation. After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug. Discharge the capacitor before the work involving the electric parts. Do not perform the work involving the electric parts with wet hands. Do not pour water into the electric parts. Do not touch the refrigerant. Do not touch the hot or cold areas in the refrigeration cycle. When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to touch the live parts. |
| | --- | | • When the refrigeration circuit has a leak, do not execute pump down with the compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes. The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap between the valve stem and the valve body, resulting in injuries. | Revision A: • MSZ-GS06/09/12/15/18/24NA- U1 , MSY-GS09/12/15/18/24NA- U1 , MSZ-GS30/36NA2- U1 and MSY-GS30/36NA2- U1 have been added. 1 TECHNICAL CHANGES MSZ-GS30NA- U1 MSZ-GS36NA- U1 1. New model MSZ-GS06NA- U1 MSY-GS30NA- U1 MSY-GS36NA- U1 MSZ-GS09NA- U1 MSZ-GS12NA- U1 MSZ-GS15NA- U1 MSZ-GS18NA- U1 MSZ-GS24NA- U1 1. New model MSY-GS09NA- U1 MSY-GS12NA- U1 MSY-GS15NA- U1 MSY-GS18NA- U1 MSY-GS24NA- U1 MSZ-GS30NA- U1 MSZ-GS30NA2- U1 MSY-GS30NA- U1 MSY-GS30NA2- U1 MSZ-GS36NA- U1 MSZ-GS36NA2- U1 MSY-GS36NA- U1 MSY-GS36NA2- U1 1. New model 2 2 PART NAMES AND FUNCTIONS MSZ-GS06NA MSZ-GS09NA MSZ-GS12NA MSZ-GS15NAMSY-GS09NA MSY-GS12NA MSY-GS15NA Front panel Air ﬁlter (Nano platinum ﬁlter) Air cleaning ﬁlter (Anti-Allergy Enzyme Filter) Air inlet Remote controller ACCESSORIES | (1) | Installation plate | 1 | | --- | --- | --- | | (2) | Attachment screws for the installation plate 4 × 25 mm | 5 | | (3) | Remote controller holder | 1 | | (4) | Screws for (3) 3.5 × 16 mm (Black) | 2 | | (5) | Battery (AAA) for

FAQs

What does the manual revision A cover for the indoor units?

Revision A lists newly added models, states OBH874 is void, and provides service information covering technical changes, components, specifications, diagrams, functions, control logic, troubleshooting, and disassembly instructions.

What refrigerant rules must be followed during servicing?

Use only the specified refrigerant. Do not use any other refrigerant, and follow instructions on refrigerant recovery and handling to prevent burst, explosion, or fire risks.

What electrical precautions are required before repair work?

Prepare proper tools and protectors, ensure ventilation, stop operation, turn off the power-supply breaker and pull the power plug, and discharge the capacitor before working on electric parts. Avoid wet hands and do not pour water on electric parts.

Oct 22, 2026

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