Is the property management responsible for the blockage of the main pipe of the air-conditioning underwater water pipe, which causes the water to flow back into the home?

Did the property company do nothing? Did they dredge and clean the sewer pipes regularly? Is it caused by heavy rain or blocked water pipes? If it is caused by too much rain, it is because the drainage capacity of the sewer pipe was underestimated in the design stage of the house, which led to the inability to discharge and reverse flow. If it is blocked, it depends on whether the property is regularly maintained and whether the owner's balcony is blocked by sundries. To tell the truth, I want property compensation, and the evidence is very important. Is it your family or all other families? This is also crucial. In practice, the property only gives you some convenience when you decorate.