Mitsubishi Electric MU-12NV - E1 User Manual

64 pages

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SERVICE MANUAL

SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················3

3. SPECIFICATION·················································6

4. OUTLINES AND DIMENSIONS ·························9

5. WIRING DIAGRAM ··········································12

6. REFRIGERANT SYSTEM DIAGRAM··············20

7. PERFORMANCE CURVES······························24

8. MICROPROCESSOR CONTROL ····················27

9. SERVICE FUNCTIONS ····································34

10. TROUBLESHOOTING······································37

11. DISASSEMBLY INSTRUCTIONS·····················45

12. PARTS LIST······················································53

13. OPTIONAL PARTS···········································61

Wireless type

Models

MS-07NV -

(

)

· MU-07NV -

MS-09NV -

(

)

· MU-09NV -

MS-12NV -

(

)

· MU-12NV -

MS-18NV -

(

)

· MU-18NV -

MS-24NV -

(

)

· MU-24NV -

MS-07NV -

(

)

· MU-07NV -

MS-09NV -

(

)

· MU-09NV -

MS-12NV -

(

)

· MU-12NV -

MS-18NV -

(

)

· MU-18NV -

MS-24NV -

(

)

· MU-24NV -

MS-18NV -

(

)

· MU-18NV -

E3E3

E2E2

E1E1

No. OB206

MS-18NV -

MS-24NV -

MS-18NV -

MS-24NV -

MS-18NV -

This Servise Manual OB206 deals with MS-07/09/12/18/24NV-E1,

MU-07/09/12/18/24NV-E1, MS-18NV-E2, and MU-18NV-E2 in

OB175 THIRD EDITION issued in June in 1997.

Therfore, please refer to OB206, not to OB175 THIRD EDITION,

for the above models.

OB206t-1.qxp 25/9/97 6:42 PM Page 1

Questions and Answers:

C
Curtis RamirezAug 3, 2025
What to do if the indoor fan motor of my Mitsubishi Electric MU-12NV - E1 Air Conditioner isn't working?
- J
  Jennifer YoungAug 3, 2025
  If the indoor fan motor isn't working, try the following: First, disconnect connector CN211 and check connector CN121 2 - 3 to ensure a rotational frequency feedback signal of 1.5V or higher exists. Then, check the indoor fan motor itself and the indoor electronic control P.C. board. Finally, ensure the connector is securely reconnected.