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Midea MEHS-09NIH2 - User Manual

Midea MEHS-09NIH2
61 pages
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Revision A: 1403100001, Content updated.
Model Numbers:
MEHS-09NiH2/MCHS-09NiH2 MEHS-09NIH1/ MCHS-09NiH1 MEHS-12NIH2/ MCHS-12NiH2
MEHS-12NIH1/MCHS-12NiH1 MEHS-18NIH2/ MCHS-18NiH2 MEHS-22NIH2/ MCHS-22NiH2
nEOLA MOnO SpLIt dC InVERtER
AIR COndItIOnER
SERVICE MAnUAL
Mono DC
Table of Contents
1. Precaution
2. Dimension
3. Refrigerant Cycle Diagram
4. Wiring Diagram
5. Installation Details
6. Operation Characteristics
7. Electronic Function
8. Troubleshooting
9. Disassembly Instructions
WARNING
Installation MUST conform with local building codes or, in the absence of local codes, with the
National Electrical Code NFPA70/ANSI C1-1993 or current edition and Canadian Electrical
Code Part1 CSA C.22.1.
The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments
Installation or repairs made by unqualified persons can result in hazards to you and others.
Failure to carefully read and follow all instructions in this manual can result in equipment
malfunction, property damage, personal injury and/or death.
This service is only for service engineer to use.

Table of Contents

Questions and Answers

  • P
    paulbrownAug 13, 2025
    What to do if Midea MEHS-09NIH2 displays outdoor temperature sensor T4 error?
    • R
      Robert JenkinsAug 13, 2025
      If your Midea Air Conditioner is displaying an error related to the outdoor temperature sensor T4, test or replace the outdoor temperature sensor T4.
  • M
    millerchadAug 17, 2025
    How to fix Midea Air Conditioner condenser coil temperature sensor T3 error?
    • M
      michael72Aug 17, 2025
      To fix an error related to the condenser coil temperature sensor T3 on your Midea Air Conditioner, test or replace the condenser coil temperature sensor T3.
  • N
    Nancy WhiteAug 20, 2025
    What does it mean when Midea MEHS-09NIH2 shows compressor discharge temperature sensor T5 error?
    • A
      Alexandra TaylorAug 20, 2025
      If your Midea Air Conditioner displays an error indicating an open or short circuit in the compressor discharge temperature sensor T5, test or replace the compressor discharge temperature sensor T5.
  • M
    Mary ObrienAug 25, 2025
    How to troubleshoot Midea MEHS-09NIH2 evaporator coil temperature sensor T2 issues?
    • J
      Jennifer RobinsonAug 25, 2025
      To troubleshoot issues with the evaporator coil temperature sensor T2 on your Midea Air Conditioner, test or replace the evaporator coil temperature sensor T2.
  • L
    Lisa ChristensenAug 28, 2025
    What should I do if Midea Air Conditioner shows indoor room temperature sensor T1 error?
    • T
      Tonya RamseyAug 28, 2025
      If your Midea Air Conditioner is showing an error related to the indoor room temperature sensor T1, test or replace the room temperature sensor T1.
  • A
    Anne HansenAug 31, 2025
    What to do if Midea Air Conditioner indicates IPM malfunction or IGBT over-strong current protection?
    • N
      nicholas17Aug 31, 2025
      If your Midea Air Conditioner indicates an IPM malfunction or IGBT over-strong current protection, inspect the IPM and IGBT for faults.
  • C
    Cynthia JohnsonSep 4, 2025
    How to resolve Midea Air Conditioner outdoor unit EEPROM parameter error?
    • S
      Shelly AdamsSep 5, 2025
      To resolve an EEPROM parameter error on the outdoor unit of your Midea Air Conditioner, check the outdoor unit EEPROM parameters and reset if necessary.
  • A
    ahudsonSep 8, 2025
    How to fix Midea MEHS-09NIH2 Air Conditioner indoor unit EEPROM parameter error?
    • J
      James JohnsonSep 8, 2025
      To fix an EEPROM parameter error on the indoor unit of your Midea Air Conditioner, check the EEPROM parameters and reset if necessary.

Summary

Precaution

Safety Precaution

General safety instructions to prevent injury and property damage.

Installation Warnings

Specific warnings related to the installation of the air conditioner unit.

Operational Cautions

Precautions for safe operation, maintenance, and handling of the unit.

Part Names and Functions

Model Identification

Lists all model numbers for indoor and outdoor units.

Dimension Specifications

Indoor Unit Dimensions

Detailed dimensions and diagrams for the indoor air conditioner unit.

Outdoor Unit Dimensions

Detailed dimensions and diagrams for the outdoor air conditioner unit.

Refrigerant Cycle Diagram

Wiring Diagrams

Indoor Unit Wiring Schematics

Electrical wiring schematics for the indoor unit of the air conditioner.

Outdoor Unit Wiring Schematics

Electrical wiring schematics for the outdoor unit of the air conditioner.

Installation Details

Installation Procedures and Guidelines

Covers torque specs, cable connections, pipe length, elevation, and first-time installation.

Refrigerant Handling for Re-installation

Procedures for collecting and handling refrigerant during re-installation processes.

Operation Characteristics

Electronic Functionality

Abbreviations and Display Icons

Explains sensor abbreviations and indoor display icons/indicators.

Main Protection Functions

Details various protection mechanisms for compressor, system, and temperature anomalies.

Operation Modes

Covers fan, cooling, heating, auto, drying, forced, timer, sleep, and auto-restart modes.

Troubleshooting

Safety Precautions for Troubleshooting

Essential safety measures, especially regarding capacitor discharge.

Unit Error Displays and Codes

Lists error codes and status indicators for indoor and outdoor units.

Diagnosis and Solution

EEPROM Parameter Error (E0;F4)

Troubleshooting steps for EEPROM parameter errors.

Communication and Detection Errors (E1, E2)

Diagnosis for communication and zero crossing detection errors.

Sensor and Leakage Errors (E3, E5, EC)

Troubleshooting for fan speed, sensor, and refrigerant leakage detection errors.

Protection Circuit Errors (P0, P1, P2, P4)

Troubleshooting for IPM, voltage, temperature, and compressor drive protection errors.

Main Parts Check

Temperature Sensor Checking

Method for checking the resistance values of various temperature sensors.

Compressor Checking

IPM Continuity Check

Indoor AC Fan Motor Check

Pressure Service Port Charts

Cooling Operation Pressure Charts

Charts showing pressure readings at service ports during cooling operation.

Heating Operation Pressure Charts

Charts showing pressure readings at service ports during heating operation.

Midea MEHS-09NIH2 Specifications

General IconGeneral
BrandMidea
ModelMEHS-09NIH2
CategoryAir Conditioner
LanguageEnglish

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