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Overloading of wires causes scorching insulation.
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I feel that it is a problem with electricity, so go to the electrician to see, and just find a property in the community.
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The wire is short-circuited and burnt, or the wire core is thin with a bath bomb that does not move, causing the wire to heat up.
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The bathroom ceiling suddenly smoked and smelled burnt, could it be that the water heater burned out, try it.
Your home must be on the first floor, as for why this is happening, it must be other users cooking or the vents in the sewer are on the road.
Maybe the wires are burned and short-circuited!! Hurry up and check it out!!
Have you had it all day or have you used something?
Check to see if there is something blocked in the sewer pipe, if not, the sewer smells bad.
The solar water heater is equipped with a solenoid valve, which can automatically turn on and off the water, and will not overflow.