Midea MPK-12CRN2 User Manual (English)

Questions and Answers:

R
Rebecca SheaAug 19, 2025
Why is my Midea MPK-12CRN2 Air Conditioner not cooling or heating?
- J
  jordanjonathanSep 12, 2025
  If your Midea Air Conditioner isn't cooling or heating, begin by checking the voltage. Verify the wiring terminals are secure, repairing them if loose. Ensure the temperature and mode settings are correctly adjusted. Inspect the compressor, overload protector, and wiring for any damage, replacing if necessary. If the unit uses an electric heater, check for damage and replace if needed. Also, examine the overheat fuse and replace if it's damaged. Finally, check the voltage of the main PCB; if the unit fails in heating mode, replace the main PCB.
R
Robert TaylorAug 22, 2025
How to fix no power display on panel of Midea Air Conditioner?
- M
  Megan Wood MDAug 22, 2025
  If there is no power display on the panel or button failure on your Midea Air Conditioner, check the power supply to ensure it's providing power to the unit. Inspect the power cord for damage and correct if necessary. Check the resistance between the input/output lines on the transformer (discharge transformer before testing), and replace the transformer if either input/output is open or the transformer is damaged. Check the voltage on the display board, replace the display board if it is +5V else replace the main PCB.
L
lsmithAug 25, 2025
What to do if Midea MPK-12CRN2 shows water full alarm?
- M
  Micheal BlackAug 26, 2025
  If you're getting a water full alarm on your Midea Air Conditioner, start by checking if the water tank is full and empty it if necessary. Inspect the water depth sensor and replace it if it has failed. Check the water pump and replace it if it's not working. If the water depth is overloaded in the chassis, drain the water by opening the drainage hose. Finally, inspect the water depth sensing structure and replace or realign it if it's faulty.
P
Paul JohnsonAug 28, 2025
How to fix Midea MPK-12CRN2 fan motor noise?
- S
  Stephen OconnellAug 28, 2025
  If your Midea Air Conditioner's fan motor is making noise, the fan blower might be cracked, out of balance, or partially missing; replace it if any of these issues are present. Check for any loose screws and tighten them. If knocking sounds continue when the motor is running, or if the motor hums or the noise appears internal, the bearings may be worn; replace the motor in this case.
D
David StephensonAug 31, 2025
What to do if compressor will not run while fan motor runs in Midea MPK-12CRN2 Air Conditioner?
- D
  Dr. Samuel ChavezAug 31, 2025
  If the fan motor runs but the compressor won't start on your Midea Air Conditioner, start by checking the voltage. Inspect the wire connections and repair or replace any loose terminals. If wires are off, refer to the wiring diagram for proper placement. Check the voltage of the main PCB and replace it if open. Examine 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 room temperature setting is at the coolest setting in cooling mode or the warmest in heating mode. Finally, check the compressor for open circuits or grounding, and replace the compressor if necessary.
M
Meghan WadeSep 6, 2025
Why does my Midea MPK-12CRN2 Air Conditioner unit start and stop frequently?
- M
  Melissa RichmondSep 6, 2025
  If your Midea Air Conditioner starts and stops frequently, the input power supply voltage may be too low. Check the voltage and call an electrician if it's not within limits. Inspect the main PCB and replace it if the compressor relay on the PCB is shorted or damaged. Also, when the room temperature is too high, the compressor will protect itself.
T
tina63Sep 9, 2025
Why does Midea MPK-12CRN2 Air Conditioner compressor stop instantly after startup?
- G
  Gary McdonaldSep 9, 2025
  If the compressor on your Midea Air Conditioner stops instantly after startup, it could be due to too much refrigerant, causing the compressor load to be too high. Recycle and recharge the refrigerant after checking for the reason. Alternatively, the compressor might be blocked internally; replace it after investigating the cause.
D
Dr. Eric Johnson MDSep 12, 2025
Why does Midea Air Conditioner fan motor run intermittently?
- K
  Kimberly HernandezSep 12, 2025
  If the fan motor on your Midea Air Conditioner runs intermittently, it may be cycling on overload. Check the voltage, and if it's not within limits, call an electrician. Test the capacitor and replace it if it's not within +/-10% of the manufacturer's rating. Check the bearings; if the blower wheel cannot rotate freely, replace the motor. If the speed does not change from high speed to low speed, replace the motor.

Midea MPK-12CRN2 Specifications

General

Brand	Midea
Model	MPK-12CRN2
Category	Air Conditioner
Language	English

Summary

1. Preface

1.1 Safety Precautions

Essential safety measures and warnings to follow before servicing the unit.

1.2 Insulation Resistance Test

Procedure to measure insulation resistance to prevent electric shock hazards after servicing.

1.3 Features

Overview of the unit's key functionalities and operational characteristics.

1.4 Control Panel Layout

Identification and explanation of the various control buttons and indicators on the unit.

2. Troubleshooting and Fault Finding

2.1 Refrigeration Cycle Flow

Visual representation of the refrigerant flow within the air conditioning system.

2.2 Electrical System Functions

Details on operating environment, electrical symbols, and systematic functions of the unit.

2.2.4 Water Level Detection and Alarms

Explanation of the water full alarm system, including sensor operation and unit response.

2.2.5 Fan-Only Mode Operation

Operational requirements and fan speed settings for the fan-only mode.

2.2.6 Cooling Mode Operation

Requirements for indoor fan speed and compressor operation in cooling mode.

2.2.7 Drying Mode Operation

Operational details for the drying mode, including compressor and fan behavior.

2.2.8 Heating Mode Operation

Operational requirements for the electric heater and fan speed in heating mode.

2.2.9 Temperature Display Information

Information on how temperatures are displayed in different modes and their respective ranges.

2.2.10 Timer Functionality

Explanation of the timer settings, including ON, OFF, and ON/OFF functions.

2.2.11 Auto Restart Feature

Description of the automatic restart feature that restores previous settings after power interruption.

3. Wiring Diagrams

3.1 Wiring Diagrams: Cooling Only Models

Wiring diagrams specific to Midea room air conditioner models designed for cooling only.

3.2 Wiring Diagrams: Cooling & Heating Models

Wiring diagrams for Midea room air conditioner models that support both cooling and heating functions.

3.3 Electrical Control Schematic

Detailed schematic illustrating the electrical control logic and connections of the unit.

3.4 Main Control Board Schematic

Circuit diagram and layout for the main control board of the air conditioner.

3.5 Display Board Schematic

Circuit diagram and layout for the display board, showing its electronic components and connections.

4. Unit Disassembly Procedures

4.1 Unit Preparation

Initial steps for unit preparation, including unplugging and draining water before disassembly.

4.2 Rear Panel Removal

Instructions on removing the rear panel, including identifying and unscrewing retaining screws.

4.3 Display Board Assembly Removal

Steps to safely remove the display board assembly from the unit.

4.4 Front Panel Removal

Procedure for removing the front panel, locating and removing securing screws.

4.5 Main Control Board Replacement

Guide on how to replace the main control board, including enclosure cover removal and wiring connections.

4.7 Evaporator Fan Motor/Electric Heater Replacement

Steps for replacing the evaporator fan motor or the electric heater unit.

4.8 Condenser Fan Motor Replacement

Instructions for removing and replacing the condenser fan motor and its associated components.

4.9 Refrigerant System Repair / Compressor Replacement

Procedures for addressing refrigerant system issues or replacing the compressor unit.

4.10 Water Disposal System Repair / Pump/Switch Replacement

Steps to repair the water disposal system, or replace the water depth switch or pump.

5. Exploded Component View

6. Spare Parts Catalog

7. Technical Specifications

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Midea MPK-12CRN2 User Manual

Table of Contents

Questions and Answers:

Midea MPK-12CRN2 Specifications

Summary

1. Preface

1.1 Safety Precautions

1.2 Insulation Resistance Test

1.3 Features

1.4 Control Panel Layout

2. Troubleshooting and Fault Finding

2.1 Refrigeration Cycle Flow

2.2 Electrical System Functions

2.2.4 Water Level Detection and Alarms

2.2.5 Fan-Only Mode Operation

2.2.6 Cooling Mode Operation

2.2.7 Drying Mode Operation

2.2.8 Heating Mode Operation

2.2.9 Temperature Display Information

2.2.10 Timer Functionality

2.2.11 Auto Restart Feature

3. Wiring Diagrams

3.1 Wiring Diagrams: Cooling Only Models

3.2 Wiring Diagrams: Cooling & Heating Models

3.3 Electrical Control Schematic

3.4 Main Control Board Schematic

3.5 Display Board Schematic

4. Unit Disassembly Procedures

4.1 Unit Preparation

4.2 Rear Panel Removal

4.3 Display Board Assembly Removal

4.4 Front Panel Removal

4.5 Main Control Board Replacement

4.7 Evaporator Fan Motor/Electric Heater Replacement

4.8 Condenser Fan Motor Replacement

4.9 Refrigerant System Repair / Compressor Replacement

4.10 Water Disposal System Repair / Pump/Switch Replacement

5. Exploded Component View

6. Spare Parts Catalog

7. Technical Specifications

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