1. Check whether the fault is caused by a power supply or cable fault.
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2. If not, it is the bath switch fault, go to the store to buy the bath switch panel first, and then deal with it.
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3. Be sure to pull off the home switch before repair, and then remove the waterproof cover of the outer layer of the switch, the side of the normal waterproof cover is attached to a small gap, take a smaller flat screwdriver inserted in, pry open can be removed.
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4. After disassembly, you can see the two screws on the left and right sides of it, and then remove the screws, you can remove the switch.