1. The window with the handle cannot be closed. It is necessary to check whether there is any obstruction in the gap of the window. Sometimes it is because something obstructed accidentally when closing the window, which leads to the failure to close, but it is not very big. The problem, we just nee Read More

1. Take necessary protective measuresThe door lock expands and contracts smoothly due to thermal expansion and contraction, especially in winter, when the seasons change, the weather changes obviously, and the temperature difference between indoor and outdoor is large, so protective measures should Read More