CHECK AND TEST 1

Step 1

Unscrew cover of mainboard with a Cross-head screwdriver. 

Step 2

Press the button SW1 on mainboard (within 1 minute of powering on the appliance) to start manual defrost. 

Step 3

Test voltage of terminals for defrost heater. 

Step 4

Take note of the result. Later power off to quit manual defrost.

The value should be 230V or 115V. 

DIAGNOSIS 1



PROCEDURE 1

Step 1

Unscrew cover of mainboard with a Cross-head screwdriver. 

Step 2

Unscrew the mainboard. 

Step 3

Pull out the buckle to take out wires.

Step 4

Disconnect terminals. 

Step 5

Pull out the buckle to remove mainboard.

Reverse above steps to install a new board. 

Step 6

Use same method to test output of new board. 

DIAGNOSIS 2

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