Mitsubishi Electric PUHY-(E)P450YHM-A

Questions and Answers

A
Ashley HessAug 20, 2025
How to fix water leakage from Mitsubishi Electric PUHY-(E)P450YHM-A Air Conditioner?
- I
  irwinkevinAug 20, 2025
  If you notice water leaking from your Mitsubishi Electric Air Conditioner, inspect the drainage lines for any clogs. Also, ensure that the unit was properly installed.
A
Alan ValenzuelaAug 22, 2025
What to do if Mitsubishi Electric PUHY-(E)P450YHM-A discharge air temperature is abnormal?
- D
  Daniel StephensonAug 22, 2025
  If you observe an abnormal discharge air temperature in your Mitsubishi Electric Air Conditioner, inspect the refrigerant levels and ensure that the compressor is functioning properly.
D
Diana HallAug 25, 2025
How to troubleshoot abnormal high pressure in Mitsubishi Electric Air Conditioner?
- V
  Veronica WilliamsAug 25, 2025
  If you notice abnormal high pressure in your Mitsubishi Electric Air Conditioner, check the system for blockages and ensure proper airflow.
M
Michelle JacksonAug 27, 2025
What causes abnormal low pressure in Mitsubishi Electric PUHY-(E)P450YHM-A Air Conditioner?
- M
  Mrs. Vanessa Cox MDAug 27, 2025
  If you observe abnormal low pressure in your Mitsubishi Electric Air Conditioner, verify the refrigerant charge and check for any leaks.
B
brownjohnAug 27, 2025
How to fix heatsink overheat protection on Mitsubishi Electric Air Conditioner?
- C
  Cynthia RussellAug 28, 2025
  If the heatsink on your Mitsubishi Electric Air Conditioner is overheating, check the airflow around the heatsink and clean any dust build-up.
B
bsanfordAug 30, 2025
How to fix temperature sensor failure in Mitsubishi Electric PUHY-(E)P450YHM-A Air Conditioner?
- B
  Bonnie WoodAug 30, 2025
  If the temperature sensor fails in your Mitsubishi Electric Air Conditioner, replace the malfunctioning temperature sensor.
A
Alicia MartinezAug 31, 2025
What to do if drain pump fails in Mitsubishi Electric PUHY-(E)P450YHM-A Air Conditioner?
- C
  Catherine HolmesAug 31, 2025
  If the drain pump fails in your Mitsubishi Electric Air Conditioner, check the drain pump for blockages and replace it if necessary.
S
smitholiviaSep 2, 2025
How to troubleshoot RPM error or motor malfunction in Mitsubishi Electric Air Conditioner?
- W
  wallashleySep 2, 2025
  If you are experiencing an RPM error or motor malfunction with your Mitsubishi Electric Air Conditioner, inspect the motor and RPM sensors for faults.
S
Steve JamesSep 4, 2025
What to do for drain pump failure or float switch trip in Mitsubishi Electric PUHY-(E)P450YHM-A?
- B
  Brian MillerSep 4, 2025
  If the drain pump fails or the float switch trips on your Mitsubishi Electric Air Conditioner, reset the float switch and check the drainage system.
E
Erin MartinSep 6, 2025
How to fix IPM error in Mitsubishi Electric Air Conditioner?
- S
  Shannon HudsonSep 6, 2025
  If you encounter an IPM error with your Mitsubishi Electric Air Conditioner, inspect the inverter for faults and replace it as necessary.

Summary

I Read Before Servicing

[1] Read Before Servicing

Check refrigerant type, symptoms, safety precautions, tools, pipes, and ventilation.

[2] Necessary Tools and Materials

Lists tools for R410A, those usable with restrictions, and those that must not be used.

[3] Piping Materials

Details copper pipe types, radial thickness, and flare processing dimensions for R410A.

[11] Characteristics of the Conventional and the New Refrigerants

Compares chemical and pressure characteristics of R410A with conventional refrigerants like R22.

II Restrictions

[1] System configuration

Summarizes compatible indoor units and outdoor units, including capacity and model types.

[2] Types and Maximum allowable Length of Cables

[3] Switch Settings and Address Settings

[8] Restrictions on Pipe Length

V Electrical Wiring Diagram

[1] Electrical Wiring Diagram of the Outdoor Unit

Detailed wiring diagram for outdoor units, showing component connections and terminal blocks.

[2] Electrical Wiring Diagram of Transmission Booster

VI Refrigerant Circuit

[1] Refrigerant Circuit Diagram

Schematic diagrams of the refrigerant circuit for different outdoor unit models.

[2] Principal Parts and Functions

VII Control

[1] Functions and Factory Settings of the Dipswitches

Explains the functions and factory settings of DIP switches on the outdoor unit's control board and INV board.

[2] Controlling the Outdoor Unit

[3] Operation Flow Chart

VIII Test Run Mode

[1] Items to be checked before a Test Run

Lists essential checks before performing a test run, including refrigerant leak, insulation resistance, and power supply.

[2] Test Run Method

Provides step-by-step instructions for conducting a test run using the MA remote controller.

[3] Operating Characteristic and Refrigerant Amount

[4] Adjusting the Refrigerant Amount

[5] Refrigerant Amount Adjust Mode

IX Troubleshooting

[1] Error Code Lists

Comprehensive list of error codes, their preliminary codes, definitions, and affected units.

[2] Responding to Error Display on the Remote Controller

Explains how to interpret and respond to specific error codes displayed on the remote controller.

[3] Investigation of Transmission Wave Shape;Noise

[4] Troubleshooting Principal Parts

[5] Refrigerant Leak

Instructions for locating refrigerant leaks in both indoor and outdoor units during cooling and heating seasons.

[6] Compressor Replacement Instructions

Step-by-step guide for safely removing and replacing the compressor components.

[7] Troubleshooting Using the Outdoor Unit LED Error Display

X LED Monitor Display on the Outdoor Unit Board

[1] How to Read the LED on the Service Monitor

Explains how to interpret the 4-digit 7-segment LED displays for numerical values and flag displays.

Mitsubishi Electric PUHY-(E)P450YHM-A Specifications

General

Model	PUHY-(E)P450YHM-A
Cooling Capacity	45.0 kW
Heating Capacity	50.0 kW
Refrigerant	R410A
Operating Temperature Range (Cooling)	-5°C to 46°C
Sound Pressure Level (Outdoor Unit)	62 dB(A)
Type	VRF (Variable Refrigerant Flow)
Power Supply	380-415V, 50Hz
Operating Temperature Range (Heating)	-20°C to 15.5°C
Series	City Multi Y Series