(1) failure or damage caused by the use of, misuse or violation of common sense in accordance with the requirements of the instructions.

(2) failure and damage caused by force majeure factors such as fire, earthquake, flood, freezing and freezing.

(3) failure and damage caused by failure of maintenance and cleanliness.

(4) failure or damage caused by careless handling, intentional modification or failure to meet the requirements of repair.

(5) the failure and damage caused by the sediment in the water supply system or the inclusion in the water supply system.

(6) the failure and damage caused by the failure to meet the requirements of the installation or the harsh environment.