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Mitsubishi Electric MUZ-A09YV-E1 - User Manual

Mitsubishi Electric MUZ-A09YV-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······························12
9. ACTUATOR CONTROL····································21
10. SERVICE FUNCTIONS·····································22
11. TROUBLESHOOTING······································22
12. DISASSEMBLY INSTRUCTIONS·····················34
13. PARTS LIST······················································38
Wireless type
Models
No. OB328
REVISED EDITION-A
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
MUZ-A09YV -
MUZ-A12YV -
MUZ-A09YVH -
MUZ-A12YVH -
E1
E1
E1
E1
MUZ-A09YV -
MUZ-A12YV -
MUZ-A09YVH -
MUZ-A12YVH -
E1
E1
E1
E1
Indication of
model name
NOTE:
This service manual describes technical data of the outdoor units.
•As for indoor units MSZ-A09YV- and MSZ-A12YV- , refer to the service manual OB327.
•As for indoor unit MCFZ-A12WV- , refer to the service manual OB344.
E1
E1E1
HFC
utilized
R410A
Revision A:
● MUZ-A12YV- and MUZ-A12YVH-
can be connected to MCFZ-A12WV- .
● Some mistakes were corrected.
E1
E1E1
Please void OB328.
OB328 A--1qxp 04.4.26 4:49 PM Page 1
Mitsubishi Electric ilmalämpöpumput korjaa ja huoltaa pääkaupunkiseudulla: Jäähdytinpalvelu RefGroup Oy
www.ilmalämpöpumput.com

Table of Contents

Questions and Answers

  • E
    Emily MitchellAug 15, 2025
    What to do if Mitsubishi Electric Air Conditioner indoor unit doesn't operate in COOL or HEAT mode?
    • A
      amyleblancAug 15, 2025
      If the indoor unit of your Mitsubishi Electric Air Conditioner isn't operating normally in COOL or HEAT mode, start by checking the indoor/outdoor connecting wire to ensure power is supplied to the indoor unit. Also, check of indoor electronic control P.C. board.
  • F
    fhamiltonAug 18, 2025
    What to do if left lamp flashes 4 times on Mitsubishi Electric MUZ-A09YV-E1?
    • S
      sarah10Aug 18, 2025
      If the left lamp on your Mitsubishi Electric Air Conditioner flashes four times, the cause is related to the indoor unit. Replace the indoor electronic control P.C. board.
  • E
    Emma SmithAug 21, 2025
    What to do if left lamp flashes 2 times on Mitsubishi Electric MUZ-A09YV-E1 Air Conditioner?
    • R
      Robert KellyAug 22, 2025
      If the left lamp on your Mitsubishi Electric Air Conditioner flashes twice, check the room temperature thermistor and the indoor coil thermistor. Refer to "Test point diagram and voltage".
  • W
    William HarringtonAug 26, 2025
    What to do if left lamp flashes 7 times on Mitsubishi Electric MUZ-A09YV-E1 Air Conditioner?
    • A
      Ashley JonesAug 26, 2025
      If the left lamp on your Mitsubishi Electric Air Conditioner flashes seven times, the cause is related to the outdoor unit. Replace the inverter P.C. board.
  • D
    Daniel JimenezAug 28, 2025
    What to do if left lamp flashes 6 times on Mitsubishi Electric MUZ-A09YV-E1?
    • B
      benjaminwilliamsAug 28, 2025
      If the left lamp on your Mitsubishi Electric Air Conditioner flashes six times, the issue stems from the outdoor unit. Refer to G "Check of outdoor thermistors".
  • P
    pmonroeAug 31, 2025
    What to do if left lamp flashes 5 times on Mitsubishi Electric MUZ-A09YV-E1 Air Conditioner?
    • B
      Brian SimpsonSep 1, 2025
      If the left lamp on your Mitsubishi Electric Air Conditioner flashes five times, the problem lies within the outdoor unit. Refer to A "Check of inverter/ compressor".
  • R
    Russell HammondSep 4, 2025
    What to do if left lamp flashes 3 times on Mitsubishi Electric MUZ-A09YV-E1 Air Conditioner?
    • T
      Tracy ChristianSep 4, 2025
      If the left lamp on your Mitsubishi Electric Air Conditioner flashes three times, the issue is related to the indoor unit. Refer to "Check of indoor fan motor".
  • B
    Brandon RogersSep 7, 2025
    What to do if left lamp flashes on and off at 0.5-second intervals on Mitsubishi Electric Air Conditioner?
    • D
      Daniel SmithSep 7, 2025
      If the left lamp of your Mitsubishi Electric Air Conditioner flashes on and off at 0.5-second intervals, the cause may be in the Indoor/ Outdoor unit. Refer to N "How to check of mis-wiring and serial signal error (When outdoor unit doesn't work)".
  • K
    Kathleen OrtizSep 12, 2025
    What to do if both lamps (Left and right) flash on and off at 0.5-second intervals on Mitsubishi Electric MUZ-A09YV-E1?
    • J
      Jake MolinaSep 12, 2025
      If both lamps (left and right) on your Mitsubishi Electric Air Conditioner flash on and off at 0.5-second intervals, the problem is related to the indoor unit. Refer to "Check of installation of the horizontal vanes".

Summary

Technical Changes and R410 A Refrigerant Information

R410 A Refrigerant Information

Refrigerant and Oil Specification Comparison

Refrigerant Piping and Tools for R410 A

Specifications

Electrical Data and Performance Ratings

Electrical specifications, capacity, airflow, and performance metrics for the units.

Outdoor Unit Electric Part Specifications

Wiring Diagram

Outdoor Unit Electrical Connections

Schematic illustrating the wiring and connections of the outdoor unit's electrical system.

Refrigerant System Diagram

Refrigerant Piping Length and Height Limits

Performance Curves

Performance Curve Operating Conditions

Cooling and Heating Performance Data

Compressor Frequency Correction Factors

Actuator Control

Outdoor Fan Motor Operation Logic

R.V. Coil Control Logic

Sensor to Actuator Mapping

Troubleshooting

Cautions and Initial Checks

Essential safety precautions and preliminary checks before troubleshooting unit issues.

Troubleshooting Flowchart Guide

A step-by-step diagnostic flowchart to identify and resolve unit malfunctions based on indicators.

Symptom and Checkpoint Table

Reference table correlating symptoms and LED patterns with specific checks and potential causes.

Main Component Diagnostic Criteria

Resistance and voltage values for testing the functionality of key electrical and mechanical parts.

Inverter and Compressor Fault Diagnosis

Detailed steps for checking the inverter, compressor, and related sub-modules for defects.

Thermistor, Coil, and Motor Checks

Procedures for testing outdoor thermistors, R.V. coil, and fan motor for proper operation.

Power Supply, Overcurrent, and Defrost Issues

Troubleshooting steps for power supply, overcurrent protection, and defrost heater malfunctions.

Mis-wiring and Signal Error Diagnosis

Methods for identifying and rectifying mis-wiring or serial signal communication errors.

Disassembly Instructions

Outdoor Unit Cabinet Removal

Inverter and Power Board Removal Procedures

Compressor and 4-Way Valve Removal

Mitsubishi Electric MUZ-A09YV-E1 Specifications

General IconGeneral
BrandMitsubishi Electric
ModelMUZ-A09YV-E1
CategoryAir Conditioner
LanguageEnglish

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