Mitsubishi Electronics MR-420R-ST-A(NZ), MR-455R-W-A, MR-385R-ST-A, MR-420R-W-A Trouble Shooting

Page 15

6TROUBLE SHOOTING

6.1TROUBLE CRITERION OF MAIN PARTS

MR-385R-A

MR-420R-A

 

 

 

 

 

 

 

 

 

 

 

 

MR-455R-A

 

 

 

 

 

 

 

 

 

 

 

MR-385R-A(NZ)

MR-420R-A(NZ)

 

 

MR-455R-A(NZ)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Components/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check Method and Criterion

 

 

 

 

 

 

Parts Mounted

 

Part Name

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Position

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MR-385R

 

 

MR-420R,455R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the machine

 

 

 

 

 

 

 

 

Model

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DG57C96RAW5

 

 

DG66C11RAW5

 

 

 

 

 

 

 

Rated input

 

 

 

 

 

 

 

W

 

 

 

106/108(220/240V 50Hz)

117/118(220/240V 50Hz)

 

 

 

 

chamber at the

 

 

 

Starting current

 

 

 

A

 

 

7.38/8.01(220/240V 50Hz)

8.05/8.83(220/240V 50Hz)

 

 

 

 

rear side of

 

 

 

Running current

 

 

 

A

 

 

0.57/0.55(220/240V 50Hz)

0.71/0.66(220/240V 50Hz)

 

 

 

 

the frame

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal

 

 

 

Abnormal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MR-385R

 

MR-420R,455R

 

(faulty)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Main wiring

18.2 (Approx.)

15.4 (Approx.)

Opened(∞ Ω )

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Auxilliary wiring

17.7 Ω (Approx.)

17.7 (Approx.)

Short (0)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Auxilialy

 

 

 

 

 

Main

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

wiring

 

 

 

 

 

wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measure the resistance with a tester.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Ambient temperature:Room temperature 15oC ~ 25oC)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Run capacitor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In the control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rated input

 

 

400VAC

 

 

 

 

panel of the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measure the resistance with a tester.

 

 

 

 

refrigerator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal

 

abnormal(faulty)

 

 

 

 

compartment

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Opened (∞Ω )

 

Short (0)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor in

 

Motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MR-385R

 

 

MR-420R,455R

 

 

 

 

 

protector

 

 

 

 

 

 

 

 

 

Model

 

 

 

 

 

 

5TM181NHBYY

 

 

5TM205NHBYY

 

 

 

 

the machine

 

 

 

 

 

 

Connected

 

 

Open

 

 

 

 

 

 

 

120 + 5o C

 

 

 

120 + 5o C

 

 

 

 

chamber at the

 

 

 

 

 

 

 

 

 

Point

 

 

Close

 

 

 

 

 

 

 

69 + 9o C

 

 

 

69 + 9o C

 

 

 

 

rear side of

 

 

 

 

 

 

Measure the

resistance

 

with a tester.(Ambient

temperature:Room temperature 15oC

~ 25oC)

the frame

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal

 

abnormal(faulty)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Less than 1

 

Opened (∞Ω )

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PTC RELAY

5

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model

 

 

 

 

 

 

PTH7M330MD2

 

 

 

 

the machine

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measure the resistance with a tester.

 

 

 

 

 

 

chamber at the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Ambient temperature:Room temperature 15oC ~ 25oC)

 

 

 

 

rear side of

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal

 

 

 

abnormal(faulty)

 

the frame

 

 

 

 

 

 

 

6

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

33 (Approx.)

 

Opened (∞Ω ) or Short (0Ω)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As PTC Relay has been heated while refrigerator is running be sure

 

 

 

 

 

to measure the resistance after the thermistor has got cool enough.

- 14 -

Image 15
Contents Mitsubishi Specification MR-420R-A MR-420R-ANZ MR-455R-A MR-455R-ANZ MR-385R-A MR-385R-ANZ Electrical Parts SpecificationMR-420R-A MR-420R-ANZ MR-455R-A MR-455R-ANZ Outlines and Dimensions MR-420R-A MR-420R-ANZ MR-455R-A MR-455R-ANZ Actual Wiring Diagram Skeleton Wiring DiagramRefrigerant Circuit MR-455R-A MR-455R-ANZ Name of Parts Trouble Shooting Measure the resistance with a tester Precautions HOW to Check P.C BoardsTest Point Diagram of Main Control Board Malfunction Display and Checking points Yes Caution Importance detail of fault analysisDisassembly Instructions Remove parts inside the refrigerator Operation ProcedureFigMR-385R,420R,455R Operating ProcedureDOOR, Body Parts Parts ListPart Name Spec Accessory Parts Part Name Spec Electricial Parts and Unit Parts Evaporator Packing Part B BOX Assy Mitsubishi Electric Corporatation

MR-385R-W-A, MR-385R-W-A(NZ), MR-455R-W-A(NZ), MR-455R-ST-A(NZ), MR-385R-ST-A(NZ) specifications

Mitsubishi Electronics has long been recognized for its innovative solutions in the realm of air conditioning and climate control. Among its impressive lineup are the MR-455R-W-A, MR-385R-ST-A, MR-420R-W-A(NZ), and MR-420R-ST-A(NZ) models, each designed to meet diverse cooling and heating needs while ensuring energy efficiency and user comfort.

The MR-455R-W-A is a versatile unit that stands out for its powerful cooling capacity, making it ideal for larger spaces. It is equipped with advanced inverter technology, which allows the compressor to operate at variable speeds depending on the cooling or heating requirements. This not only enhances energy efficiency but also ensures quieter operation, making the MR-455R-W-A a perfect choice for residential and commercial environments.

Similarly, the MR-385R-ST-A model offers a balance of performance and compact design. This unit is particularly suitable for medium-sized rooms and employs a range of smart features, including a programmable timer and a user-friendly remote control. Its energy-saving mode aims to reduce electricity consumption during off-peak hours, making it an eco-friendly option.

The MR-420R-W-A(NZ) is tailored specifically for the New Zealand market, emphasizing performance in diverse climatic conditions. This model incorporates Mitsubishi's sophisticated air filtration technology, effectively removing dust, allergens, and other pollutants from the air, contributing significantly to indoor air quality. With its sleek design and efficient operation, the MR-420R-W-A(NZ) is ideal for modern homes looking for both aesthetics and functionality.

In contrast, the MR-420R-ST-A(NZ) offers similar benefits but with a focus on reliability and durability. Its robust construction ensures it can withstand varying weather conditions, while the energy-efficient operation helps in minimizing utility costs. Both MR-420 models share a common feature – the ability to operate quietly, making them suitable for bedrooms or study areas.

Each model utilizes Mitsubishi's proprietary technologies aimed at maximizing energy efficiency and comfort. Features such as self-diagnosis capabilities, easy installation, and maintenance enhancements contribute to the overall user experience.

In conclusion, Mitsubishi Electronics has designed the MR-455R-W-A, MR-385R-ST-A, MR-420R-W-A(NZ), and MR-420R-ST-A(NZ) as reliable and efficient air conditioning units. With features focusing on energy conservation, indoor air quality, and user-friendly operation, these models cater to a wide range of customer needs and preferences.