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It should be a condensate problem, with a large temperature difference and large humidity.
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It is also possible to go into the water, and you have to look at the water meter for tap water.
If you don't make any changes during the warranty period, the construction unit is responsible, otherwise you have to spend money to repair it.
If, as you said, your house is not occupied, the kitchen and bathroom must not be used, so it should be that you are more likely to isolate water seepage, and furthermore, if your home is decorated, you can do a layer of waterproof in the kitchen and bathroom.
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It is the leakage of your water pipe, the leak detection is generally 24 hours, and the pressure of your house will be reduced by 1 kg in 12 hours, indicating that the water leakage is very heavy. However, it is difficult to check the leakage point, so it is better to rework all of them, reinstall them to save trouble, and it is more safe.