No sound when the lifting button is pressed

• Checking method:

  1. Make sure limit switch cables are correctly positioned. Check if any loose connections. Video of repair instruction as below.

  2. Press lifting button and use a multimeter to test if there is voltage on lifting contactor coil.

  If voltage is detected but lifting contactor doesn't work, then contactor is damaged.

  3. If no voltage is detected, check if connection between controller lifting cable and lifting contactor cable is faulty

  If no problem, use a multimeter to check if lifting button is normal

  If above causes are ruled out, the oretically it can only be fault with display circuit board  (but this has never occurred)