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No number displayed when pressed the button
Check whether the connecting belt of the transfer plate has come off (The far left connecting belt). Here is the video: https://youtu.be/1n-wzaA
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Display screen Keep showing digit"8",unchanged and low digits，digits do not respond to smoke?
Check whether the connecting belt of the transfer plate has come off (The PM2.5 connecting belt). Here is the video: https://youtu.be/LQO4pyiQPhc.
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Fan does not work?
Check whether the connecting belt of the transfer plate has come off （FAN connecting belt）.Here is the video:https://youtu.be/FihvNTWJofE.
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Lights flickered and the unit keeps making noise?
Replace the keypad. check whether the connecting belt of the transfer plate has come off（the middle two connecting belts）.Here is the video: https://youtu.be/0cBZam5oGcg.
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Unable to start the unit ?
Replace the main control panel : Here is the video:https://youtu.be/OL-tuSfzE
