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Determine that it is a circuit, not a light is not a switch, it is recommended to see if the light is broken or a switch problem, and try to change a switch or something.
There is no problem at all, the smart toilet 220-250 can be used.
Check the voltage of the live wire to the neutral line and the voltage of the live wire to the ground wire. >>>More
There is a short circuit between the two lines.
The two wires can be used as one, and the ground wire can be used as the zero line temporarily. >>>More
It is possible that the neutral wire is broken, resulting in the equal potential of the live wire and the neutral wire, that is. Neutral live is just one possibility.
The multimeter measurement does not reflect the real situation, i.e., it cannot simulate the real working voltage, current test, and the leakage current tester does this.