Hi Mukesh,

Marc is correct in saying that the problem is related to valve 25. The question I ask is how many times has this occurred and is it on the same machine or numerous machines.

The reason why it alarms constantly is that it is a fatal alarm, where the machine locks up. The only solution is to power down. If after waiting a few minutes, the problem returns, then pull from service. From my experience it is not a valve problem but a board communication failure. If the problem is constant, start by switching out the act. board, then the function board and finally the valve. 

Hopefully this helps.
Reg