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Mitsubishi Electric MU-A18WV-E1 - User Manual

Mitsubishi Electric MU-A18WV-E1
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SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························7
5. OUTLINES AND DIMENSIONS ·························8
6. WIRING DIAGRAM ············································9
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES······························14
9. MICROPROCESSOR CONTROL ····················22
10. TROUBLESHOOTING······································25
11. DISASSEMBLY INSTRUCTIONS·····················32
12. PARTS LIST······················································38
Wireless type
Models
MU-A18WV -
MU-A24WV -
MU-A30WV -
E1
E1
E1
SPLIT-TYPE, AIR CONDITIONERS
MU-A18WV -
E1
Indication of model name
NOTE:
•This service manual describes technical data of outdoor units.
As for indoor units MS-A18WV- , MS-A24WV- and MS-A30WV- , refer to the service manual
OB325.
E1E1E1
No. OB326
REVISED EDITION-A
Revision A:
● Resistance of LEV (Expansion valve) has been
modified.
● Power input and others have been added to
SPECIFICATION.
HFC
utilized
R410A
Please void OB326.
OB326A-1.qxp 04.2.9 10:41 AM Page 1

Table of Contents

Questions and Answers

  • T
    Teresa WhiteAug 11, 2025
    What to do if the OPERATION INDICATOR lamp on my Mitsubishi Electric MU-A18WV-E1 is flashing?
    • M
      Matthew AyalaAug 11, 2025
      If the OPERATION INDICATOR lamp on your Mitsubishi Electric Air Conditioner is flashing, it could be due to several reasons: * Trouble with the room temperature or indoor coil thermistor: Check the room temperature thermistor and indoor coil thermistor. * Trouble with the indoor fan motor: Consult the relevant check section for the indoor fan motor. * Trouble with the indoor unit control system: Replace the indoor electronic control P.C. board. * Trouble with a thermistor in the outdoor unit: Refer to the check section for the outdoor thermistor on page 30. * Trouble with the outdoor control system: Replace the deicer P.C. board. * Trouble with low discharge temperature protection: Refer to the check section for the LEV on page 30.
  • M
    Maria GonzalezAug 20, 2025
    What to do if my Mitsubishi Electric Air Conditioner indoor unit doesn't operate when the EMERGENCY OPERATION switch is pressed?
    • J
      jennifereatonAug 20, 2025
      If the indoor unit of your Mitsubishi Electric Air Conditioner does not operate when the EMERGENCY OPERATION switch is pressed: 1. Check the indoor/outdoor connecting wire. 2. Refer to the check section for the indoor electronic control P.C. board.
  • P
    Patrick YoungAug 31, 2025
    Why is my Mitsubishi Electric Air Conditioner outdoor unit only operating in Test Run mode?
    • T
      Thomas SmithAug 31, 2025
      If your Mitsubishi Electric Air Conditioner outdoor unit is only operating in Test Run mode, check the room temperature thermistor. Consult the section on test point diagrams and voltage.

Mitsubishi Electric MU-A18WV-E1 Specifications

General IconGeneral
Cooling Capacity (kW)5.0
Power Supply220-240 V, 50 Hz
RefrigerantR32
Energy Efficiency Class CoolingA++
Energy Efficiency Class HeatingA+
Outdoor Unit Dimensions (W x H x D)800 x 285 mm

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