Mitsubishi Electronics MR-385R-ST-A(NZ), MR-455R-W-A Malfunction Display and Checking points

Page 19

6.4 Malfunction Display and Checking points.

6.4.1) Malfunction display will use LED for show self-check

6.4.2) Fucntion display

1 time

2 times

ON

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

Cycle

 

 

 

 

 

 

1 time 2 times

5 Sec.

5 Sec.

 

Cycle

1 time 2 times

1 time 2 times

5 Sec.

5 Sec.

Cycle

Cycle

 

6.4.3 ) Repairing and check point

* A the case below , if the analysis result has malfunction over 2 points and will express in the list has more importance.

 

 

 

Function display

 

Cause

Analysis result

 

Check point

 

Corrective

Priority Repairing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 time

Fault trouble of freezer thermistor

Open circuit or short

1.

Check connector of control PCB CN5 , relay

Improve in contact

1

-

 

 

 

 

circuit case

connector 6 pin

 

 

18

 

 

 

 

 

 

 

 

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.

Check the resistance of thermistor

 

Change part

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

selfdisplayLED- check

 

displayMalfunction

 

 

 

Open circuit or short

1.

Check connector of control PCB CN5

,

Improve in contact

 

 

 

modeLighting

2 times

Fault trouble of defrost thermistor

1.

Check connector of control PCB CN1

,

2

 

 

 

 

 

 

 

 

 

circuit case

relay connector 2 pin

 

 

 

 

 

 

 

 

 

 

2.

Check the resistance of thermistor

 

Change part

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defrost unfinished

relay connector temp. fuse

 

Improve in contact

 

 

 

 

 

 

3 times

Fault trouble of defrost heater

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

with in 2 hours

 

 

 

 

 

 

 

 

 

2.

Check the resistance of defrost heater

 

Change part

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.

Check the resistance of temp. fuse

 

Change part

 

 

Caution

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.Before plug in the AC power , Be ensure the comp had been off more than 20 min.

2.The consider short circuit or open circuit of thermistor , resistance of open circuit is ∞ Ω , resistance of short circuit is 0 Ω

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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.
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