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14

4 Troubleshooting

When receiving a cooker for service from the user, please check if the product remains intact (e.g. pan, valve for warming, etc.), and 

ask the user to describe the symptom of the malfunction. Unplug the power cord when carrying out component-level checks.

4.1. 

Before Problem Diagnosis

 • The problem diagnosis table is divided into two sections: Vol. 1 for the cooker's main unit, Vol. 2 for the control circuit board.

 • Start diagnostic evaluations with Vol. 1.

 • Check if the symptom of the malfunction cooker is listed in the Vol. 1 diagnostic section. If no item is found, perform a quick check 

test of the control circuit board (refer to P9). If any fault is found, continue the diagnostic evaluation referring to Vol. 2.

 • The problem diagnosis table primarily lists suspect component assemblies (parts) and areas.

 • Refer to P11 for parts-level determination of malfunctions for each board.

Notes on handling the printed circuit board with microprocessor

Notes on handling the printed circuit board with microprocessor

  The microprocessor is constructed of CMOS digital IC (integrated circuit) and MOS FET (Metal-Oxide-Semiconductor Field-Effect 
  Transistor) technology, and is extremely sensitive to static electricity, including static discharges from human body, clothing, and  
  from objects, including soldering irons. Handling with great care as specifi ed below:

 • When handling, workers should be well grounded.

 • Ground soldering irons. Do not use poorly insulated soldering irons. It is recommended to use soldiering irons with microcircuitry.

 • Do not touch the pins of ICs or other elements with your hands before well grounded. Do not place the board on a conductive 

surface that may be charged.

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15

  • Do not insert parts from the reverse side of the board.

 • When testing with a multimeter during continuous tests, do not use high resistance ranges (×10,000), which may subject ICs and 

other components on the board to excess voltage and thus cause damage.

 • Keep soldering time as short as possible (within a few seconds)

 • Unplug the power cord before replacing any components.

 • Be aware of the risk of electric shock or injury when handling a live control board. The control board's transformer carries 220 V AC.

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5  PROBLEM DIAGNOSIS TABLE Vol.1 (for the cooker's main  
 unit)

Drawing No.

16

37

43

51

15

7

27

  

※Refer to P9 and P10    

if the defective location 
is on the PCB.

Does not 
cook rice

COOKING 
LED lights up

〇

〇

COOKING 
LED does not 
light up

〇

〇

〇

〇

If the thermal fuse has 
melted, fi rstly fi nd out 
the reasons and then 
exchange the defective 
parts.

Cannot cook rice correctly.(stops 
early or cooking is uneven, etc.)

〇

〇

〇

〇

This may occur due 
to user’s wrong 
measurement or 
insuffi cient loosening 
of rice.

Rice on the bottom of the inner 
pan is scorched dark brown.

〇

〇

〇

〇

Check that there 
is no dirt or foreign 
substances stuck to 
the surface of the pan 
sensor.

Keep Warm temperature is high.
(78°C or higher)

〇

〇

〇

〇

Keep Warm temperature is low.
(68°C or lower)

〇

〇

〇

〇

〇

Does not Keep 

Warm

Keep Warm 

LED lights up

〇

Droplets fall onto the surface of 
the rice.

〇

〇

〇

This may occur by 
cutting off the power or 
insuffi cient loosening of 
rice.

The surface of the rice dries up.

〇

〇

〇

This may occur when the 
lid is kept open for a long 
time or by insuffi cient 
loosening of rice, or the 
valve for warming comes 
off.

The bottom of the cooker melts or 
gets on fi re.

〇

Malfunction 

Symptom

Status of 
main unit

Malfunction 

Suspect 

Component

Cast Heater

Pan Sensor

Complete power

terminal

AC cord

Pan

Parts on PCB

Lid Heater (only for 

TWN and Indonesia)

Side Heater (only for 

TWN and Indonesia)

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6  QUICK CHECK TEST OF THE CONTROL BOARD

Before beginning diagnostic evaluation of a problem, perform a quick check test of the control board, as explained below. If anything 
abnormal, then perform reset operation once (refer to P11)
If still abnormal, please refer to the problem diagnosis table Vol. 2. (P9) and diagnosis methods for defective components (P10) ), to 
exchange the parts on P.C.B or control board comp.

1

Connect the unit to a power source. In stand-by mode, using three fi ngers simultaneously press and hold [Start], [Off], [White 
Rice] buttons.

[Figure A]

2

As soon as you release the three buttons, as shown in Fig. B on the right, [Quick Cook/Steam] indicator lights up, and press [Quick 
Cook/Steam] button.

[Figure B]

3

Repeat according to the sequence of: Quick Cook/Steam indicator lamp

White Rice indicator lamp
indicator lamp for Brown Rice
indicator lamp for Porridge/Soup
Keep Warm indicator lamp

and then the heating becomes the full-power heating mode. When it is heated 
to the final temperature of cooking, it will automatically shift to constant 
temperature mode.

[Figure C]

4

Press [off] button once. Press other buttons and confi rm that operation is normal.

After carrying out procedures 1 to 4, if test results are normal, you can conclude that P.C.B.(Comp.) has passed the test.

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