1. The oil temperature is below 25 ℃ or the lubricating oil pressure is lower than the normal value. 

2. Any security device does not work properly. 

3. The main steam valve, regulating steam valve, extraction non-return valve have jamming phenomena. 

4. The self-starting device of the auxiliary oil pump device does not work properly. 

5. Tachometer and other indicating instrument appear abnormal error.

6. The vibration is more than 0.07 mm.