Troubleshooting-1: check whether the water tank runs out of water; refill water if necessary. Troubleshooting-2: check that the mopping cloth has been tightly installed. If the cloth is not tightly installed, the white filter assembly may not properly supply water to the mopping cloth. The filter may be blocked. Please immerse the filter assembly in citric acid or white vinegar; if the problem persists, replace the filter assembly. Troubleshooting-3: please wet the mopping cloth before mopping and squeeze it dry before installation. If the mopping cloth is dirty, please clean it before reuse. Do not use non-original mopping cloth that may result in insufficient water flow. Troubleshooting-4: please check that the water tank is installed in place.