1. When the steam pressure rises to 5.2MPa or the steam admission temperature is larger than 490℃ and can not recover to normal value.
2. When the steam pressure decreases to 3.8MPa or the steam admission temperature is less than 400℃ and can not recover to normal value.
3. When The vacuum of the steam condenser decreases to -0.061MPa, and can not recover the normal value.
4. When the valve stem of the steam control valve falls off, and the steam control valve is blocked( as applicable ).
5. When the copper tube of the condenser fractures.