Troubleshooting

4.Checking Display PCB LED if Error code is displayed. See error code table if displayed.

5.Checking DC voltage on each point

Item

Measuring point

Normal value

 

 

 

DC LINK

Q803 E(-)~D101 Cathode (+)

about 1.4 times as much as Power AC Voltage

ex) AC220V 305~310Vdc

 

 

 

 

 

inverter 15V

C803 voltage

14.5V~15.5V

 

 

 

Main control 12V

CN59 pin 1~pin 3

12V~15V

 

 

 

Main control 5V

CN59 pin 1~pin 2

4.75V~5.25V

 

 

 

6. Checking PFC

6.When Input current is over 2.8A PFC circuit will work to control the harmonics of AC current. Checking is measuring DC-LINK voltage.

PFC ON (Compressor is working) : DC LINK voltage is over 300Vdc (AC line >220V ) After starting compressor DC Link voltage is going down because of compressor load.

But in case of 2.8A above , DC link voltage will go up over 300V. This voltage is in proportion to AC input voltage. Current can be monitored with "VIEW MODE".

Press K4 key on the outdoor display PCB for several times to change the display to sensor temperature value. Left 1 digit of the LED is data index and Right 3 digits are the value

Index

Value

Remark

 

 

 

C

Estimated Primary current value from

The unit is 0.1A

Compressor current

 

 

 

 

 

9-15

Samsung Electronics

Page 85
Image 85
Samsung MH026FNCA service manual Measuring point Normal value, Index Value Remark

MH026FNCA specifications

The Samsung MH026FNCA is an innovative solution designed to meet the diverse needs of residential and commercial spaces. As a part of Samsung's advanced lineup of air conditioning systems, this model exemplifies the brand's commitment to quality, efficiency, and cutting-edge technology. With an array of features, the MH026FNCA stands out as an ideal choice for users seeking reliable climate control in their environments.

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The robust build quality of the MH026FNCA enhances its reliability, ensuring long-lasting performance even in demanding conditions. With a sleek design and compact size, it can easily blend into different interior decors while providing quick and effective cooling or heating, depending on the season.

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