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Water-cooled plate heat exchanger units have been widely used in recent years for heating in residential buildings, government offices, hospitals, hotels, and other facilities. They are also used in conjunction with central air conditioning systems. Thanks to their superior performance, rational design, compact structure, safe and reliable operation, as well as easy installation and operation, they are highly favored by the market and customers. However, given that every piece of equipment has a limited service life, the key is to carry out proper maintenance in order to extend the lifespan of water-plate heat exchanger units. Today, I will introduce the following points to you: 1. Inspect the inside of the boiler. 2. Inspect the boiler accessories, focusing on whether the valves can be opened and closed smoothly, and ensuring that all instruments and control devices are present. The pressure gauge tap should be opened. 3. Inspect the furnace chamber and flue, paying special attention to the presence of dust; if any is found, it should be removed promptly. It is necessary to ensure that the valve plates in the air ducts and flue ducts are airtight and can be opened and closed flexibly. 4. The combustion equipment is the most important part of a boiler; it is necessary to check whether the combustion system is intact and in good condition, to ensure the proper operation of all systems, to adjust the tension of the safety spring in the speed control box appropriately, and to maintain good lubrication. 5. Inspect the auxiliary heating surfaces; we should check whether the couplings of these surfaces are firmly connected and whether the cooling water can flow smoothly. 6. Check the automatic control system. 7. Check the auxiliary equipment of the heat exchanger unit. 8. Inspection of the heat exchange unit: The heat exchange unit is one of the most critical components of a boiler, and we must ensure that the heat exchanger can carry out heat exchange properly.