If Crown finds abnormal sound in the skylight, it can check whether it is caused by the following reasons. Cause of abnormal sound 1: aging of roof sealing strip. The skylight sealing strip is easy to age after long-term sun and rain, and the rubber curing agent can temporarily restore the performance of the sealing strip. Open the skylight to the bottom and spray the maintenance agent on the sealing strip. Of course, the more direct method is to replace the roof sealing strip. Cause 2 of abnormal sound: the skylight screw is loose. Loose screws will lead to abnormal sound of ceiling and skylight, and even the hidden danger of skylight falling off. The solution is simple, just find the skylight screw and tighten it. Cause 3 of abnormal sound: there are dust particles on the skylight slide rail. Skylights come and go, and dust will inevitably accumulate in the gap of the slide rail. When dust accumulates to a certain extent, the skylight will produce friction and abnormal sound when it is opened and closed. Dust can be removed with a towel, and regular maintenance is very important. So how to solve the abnormal sound of the crown roof? Apply grease to the left and right slide rails of the sunroof. Pay attention to check the abnormal sound of the skylight before, because this is the place with the greatest friction. Apply grease evenly to the left and right sides of the skylight bit by bit, and accurately apply grease to the slide rail, not the outside. After brushing, brush it again in the place where the skylight sounds abnormal to ensure smoothness and smoothness. Another is routine maintenance, such as cleaning the chute and other routine maintenance.