How to maintain the kitchen steamer?

The steam box requires that all gas and water pipelines have no leakage, all valves are intact and flexible, the water level of the water tank is appropriate to cover the steam coil, the door seal can't leak steam, the handle can't be too loose, the steam coil is intact, the steam trap works normally, and the float valve is closed. The trap should be dismantled and inspected once every six months, and the float valve should be replaced with the rubber core once every six months.