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CAUSES AND REMEDIES :-

1. ANY INTERLOCK IS ACTIVATED.
2.  AIR PRESSURE TO LOW :-  COMPRESSOR TO BE STARTED AND CHECK THAT THEY ARE WORKING PROPERLY, ALSO CHECK WHETHER AIR IS LEAKING ANY WHERE SPECIALLY DECK AIR.
3. AIR BOTTLE VALVE CLOSED :-  OPEN THE VALVE
4. MAIN VALVE CLOSED :- SET THE MAIN STARTING VALVE AT SERVICE POSITION.
5. MAIN STARTING VALVE IS STICKING CLOSED POSITION :- LUBRICATE AND         MOBILIZE PISTON AND LATER OVERHAUL THE VALVE.
6. VALVE AT DISTRIBUTOR CLOSED :- OPEN THE VALVE FOR AIR TO DISTRIBUTOR.
7. NO AIR PRESSURE IN PNEUMATIC STARTING SYSTEM :- CLEAN THE FILTER IN THE LINE AND CHECK THE VALVES POSITION.
8. SOLENIOD VALVE MAY BE FAULTY.