1. Check every liquid level gauge to confirm whether the water level decreases really or not and check the load changes. 

2. If the water level is found to decrease, the make-up water valve shall be immediately opened wide, and the person in charge of chemical water treatment shall be contacted to add the flow rate of the demineralized water  in order to maintain normal water level in the deaerated water tank. If measures have been taken, but the water level still continue to decrease, the monitor and the shift chief-operator shall be reported to reduce the load for operation. 

3. Check whether the electric regulating valve for make-up water is in failure or nor, the bypass valve can be opened for supplementing water. Check whether the water draining valve at the deaerator is closed tightly or opened by mistake. 

4.Check whether the water draining valve at the deaerator is closed tightly or opened by mistake. 

5. When the water supply valve is opened by mistake or the water supply system and boiler economizer leak, the maintenance personnel shall be informed to take corresponding measures to deal with as soon as possible. 

6. In case the water supply system or water relay system is in failure, it shall be dealt with as soon as possible according to the actual situation.