Midea MWF-12CM

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Website: www.mideaaircon.com

Service manual

CAUTION

- BEFORE SERVICING THE UNIT, READ THE SAFETY

- PRECAUTIONS IN THIS MANUAL.

- ONLY FOR AUTHORIZED SERVICE PERSONNEL.

MODELS: MWF-07CM

MWF-09CM

MWF-12CM

MWF-16CM

MWF-18CM

MWF-21CM

MWF-24CM

Table of Contents

Questions and Answers:

E
Eric AdamsAug 18, 2025
Why is my Midea Air Conditioner not cooling or heating at all?
- P
  Patricia JohnsonAug 18, 2025
  If your Midea Air Conditioner is not cooling or heating, check the voltage and call an electrician if it's not within the limit. Inspect the terminals and repair or correct any loose connections. Check and adjust the thermostat and main switch settings. Inspect the resistance of the reverse valve wire and replace it if it's shorted, open, or damaged. If the reverse valve is blocked, which prevents heating, replace it after checking the reason.
F
fcarterAug 20, 2025
Why is my Midea Air Conditioner fan motor so noisy?
- C
  cmejiaAug 21, 2025
  If your Midea Air Conditioner fan motor is noisy, replace the fan or blower if it's cracked, out of balance, or partially missing. Tighten any loose screws. If knocking sounds persist or the motor hums, replace the motor due to worn bearings.
M
Madeline MaynardAug 25, 2025
Why does my Midea MWF-12CM start and stop frequently?
- M
  mgonzalezAug 25, 2025
  If your Midea Air Conditioner unit starts and stops frequently, the input power supply voltage may be too low; consult an electrician if it's not within limits. Alternatively, the compressor may be protecting itself because the outdoor temperature is too high.
L
laura31Aug 28, 2025
What to do if Midea Air Conditioner compressor will not run but fan motor runs?
- J
  Joan GarciaAug 28, 2025
  If your Midea Air Conditioner compressor won't run while the fan motor does, check the voltage and call the Supply Authority if it's not within limits. Inspect the wire connections; repair or replace any loose terminals, and refer to the wiring diagram to correct any misplaced wires. Replace the main switch if it has failed. Check the capacitor and replace it if it's not within +/-10% of the manufacturer's rating or if it's shorted, open, or damaged. Ensure the thermostat is set to the coolest setting for cooling mode or the warmest for heating mode. Check the compressor for an open circuit or ground; replace it if found.
D
Darren BakerAug 30, 2025
How to fix Midea MWF-12CM fan motor that will not run?
- D
  Daniel WilliamsAug 31, 2025
  If your Midea Air Conditioner fan motor won't run, first check the voltage at the electrical outlet and correct it if there's no power. Then, check the voltage at the power cord terminal and replace the power cord if there's no voltage. Inspect for disconnected or loose wires, connecting them according to the wiring diagram and repairing or replacing any loose terminals. If the main switch has failed, replace it. Test the capacitor (after discharging it) and replace it if it's not within +/-10% of the manufacturer's rating or if it's shorted, open, or damaged. Finally, realign the assembly if the fan blade is hitting the shroud or the blower is hitting the scroll, and check the fan motor bearings; replace the motor if the shaft doesn't rotate.
C
Christopher MillerSep 3, 2025
What to do if Midea Air Conditioner stops instantly after startup?
- J
  Julie GarciaSep 3, 2025
  If your Midea Air Conditioner stops instantly after startup, it could be due to too much refrigerant, causing the compressor to overload. Recycle and recharge the refrigerant after identifying the cause. Alternatively, the compressor may be seized, requiring replacement after checking the reason.
H
Heather PopeSep 7, 2025
Why Midea MWF-12CM fan motor runs intermittently?
- H
  Heidi TapiaSep 7, 2025
  If your Midea Air Conditioner fan motor is running intermittently, check the voltage and consult an electrician if it's not within the correct limits. Test the capacitor and replace it if it's not within +/-10% of the manufacturer's rating. Check the bearings and replace the motor if the fan blade doesn't rotate freely. Also, observe any changes from high to low speed; replace the motor if the speed doesn't change.
C
Christopher PooleSep 10, 2025
What to do if Midea Air Conditioner compressor doesn't stop?
- L
  Lauren Thomas MDSep 10, 2025
  If the compressor of your Midea Air Conditioner does not stop even when the room temperature reaches the setting temperature, check the thermostat and replace it if it is damaged.

Midea MWF-12CM Specifications

General

Brand	Midea
Model	MWF-12CM
Category	Air Conditioner
Language	English

Summary

Preface

Safety Precautions

Safety precautions to be followed before and during servicing the unit.

Insulation Resistance Test

Procedure for performing an insulation resistance test on the unit.

Features

Diagram Panel

Explanation of the control panel and its functions.

Outside Dimensions

Table of physical dimensions for various models.

Installation

Select the Best Location

Recommendations for choosing the optimal installation site.

Check of Installation

Essential checks to perform after the unit is installed.

How to Drain

Instructions on how to properly drain condensate from the unit.

How to Install

Detailed procedure for the installation process of the air conditioner.

Installation of the unit into the housing

Steps for fitting the unit into its designated housing.

Installation of the unit into the wall

Alternative method for installing the unit directly into a wall.

Installation steps

A step-by-step guide for the installation of the air conditioner.

Troubleshooting Guide

Refrigeration Cycle Diagram

Visual representation of the unit's refrigeration cycle.

Wiring Diagram

For models: MWF-07 CM MWF-09 CM

Wiring diagram specific to MWF-07CM and MWF-09CM models.

For models: MWF-12 CM

Wiring diagram specific to the MWF-12CM model.

For models: MWF-16 CM

Wiring diagram specific to the MWF-16CM model.

For models: MWF-18 CM

Wiring diagram specific to the MWF-18CM model.

For models: MWF-21 CM MWF-24 CM

Wiring diagrams specific to MWF-21CM and MWF-24CM models.

Exploded Views

Specifications

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