Chapter Ⅳ Maintenance（2. Troubleshooting）
63
2.1.7 Temperature sensor error
Temperature sensor error
Yes
Check if the temperature sensor
plug and the socket on the main board
are connected correctly
Remove the sensor. Measure if its
resistance is in the normal range
No
Confirm the positions of the plug
and socket
Replace the sensor
No
Replace the main board
Yes
Yes
2.2 Controller Troubleshooting
2.2.1 Fault of display board
◆Phenomenon: Display board is not lighted up after powering on.
◆Possible causes: ① Display board malfunctions; ② The line is wrongly connected.
◆Troubleshooting: First check whether the main board is powered on. If condition permits,
use a multimeter to test whether each power module can operate normally. Alternatively, you can
just check whether the digital tube of the main board is displayed normally. Normally, the 2-digit
digital tube should display “00” or an error code. You can also check whether the communication
indicator is lighted up. After making sure that main board is powered on, check whether the
communication cable of display panel is connected correctly. If yes, you can judge that the display
panel is damaged. Replace the display panel.
2.2.2 Fault of main board
◆Phenomenon: The main board does not work after powering on.
◆Possible causes: ① Main board malfunctions; ② The line is wrongly connected.
◆Troubleshooting:
①check if there is any err code display on display board or the double 8 digital displayer on
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