1. If hair, thread ends, small pieces of paper, or other foreign objects get tangled around the roller brush, it will cause the brush to rotate smoothly and produce abnormal noise.
2. Internal parts are loose. For example, the screws of the motor are loose, or the transmission parts are worn.
3. Hard objects are sucked in. Coins, small stones and other hard objects may be accidentally sucked in and get stuck in the pipes or motor parts inside the machine.
Solutions: 1. Check the roller brush(es). Take out the roller brush and clean the foreign objects tangled on it. If the roller brush is damaged, a new one needs to be replaced. 2. Check the internal parts. For users with maintenance experience, they can open the machine casing, and check whether the screws are loose and whether the transmission parts are worn. If any parts are found to be loose, tighten them; if the parts are worn, the corresponding parts need to be replaced. However, this operation may affect the machine's warranty, so it is better to contact professional maintenance personnel. 3. Check the suction channel. If it is suspected that hard objects have been sucked in, turn off the machine, carefully check the suction channel and the sewage tank, and take out the hard objects.
