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There is no doubt that the problem is in the bathroom, because the power of the water heater is very large, your total control load capacity is a little small, and the temperature of the total control will be very high when you use it, so there will be a sizzling sound, it is recommended that the total control capacity can be selected to be a level larger.
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Overload or the total air opening performance has decreased, it is recommended to replace an air opening to try it.
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Only the initiative has the right to choose. To be passive is to be natural.
Find the plumber who renovated your home to deal with it.
It is a skipping trip, and this phenomenon is because the leakage current exceeds the leakage current of the main switch
It's a problem with the sewer pipe, the upper flush is connected to your toilet, so there will be a little noise, or your toilet is siphoning, and the water from the upper layer will be flushed down together with part of the water stored in your toilet
If the home is too damp, carefully find out the cause to see if the moisture is transmitted by the ground or wall, and find a way to deal with it.
It may be that the water quality of your home is not very good, there are many impurities, and it is too much to worry about in the box, and cleaning it frequently will prolong the service life.