TM 55-1930-209-14&P-2 Table 4-3.  Seawater System Troubleshooting (Cont'd) Problem Probable Cause Suggested Action 3. Cooling pump not operating a. Motor controller off (Figure 4-1) a. Start  pump  by  closing  switch  and  pushing START button b. Circuit    breaker    1P5    on    power panel 1 open (OFF) b. Close (ON) circuit breaker c. Cooling pump malfunctioning c. Troubleshoot (Table 4-1) 4. Seawater    intake    pressure inadequate a. Seachest blocked a. Blowdown   forward   seachest   in   Void   2 Starboard (paragraph 4-3.8.1) b. Strainer basket clogged b. Change flow and clean basket (paragraph 4-7.2.3.2) c. Suction valve SW1 or SW2 partially or fully closed c. Open Valve 5. Seawater not being supplied to ROWPU a. Valve SW1, SW2, or SW4 closed a. Open  valve  SW1  or  SW2  if  water  is  to  be supplied   from   seachest   or   valve   SW4   if water   is   to   be   supplied   from   starboard shell penetration b. Seawater   strainer   valve(s)   SW9 and/or SW10 closed b. Open valve(s) c. Seawater    pump(s)    1    and/or    2 malfunctioning c.  Troubleshoot seawater pump(s) (Table 4-1) d. Seawater strainer clogged d. Switch   to   alternate    strainer    and    clean clogged strainer (paragraph 4-7.2.3) e. Seawater pump discharge valve(s)     SW16,     SW17,     and/or SW19 closed e. Open valve(s) SW16, and/or SW19 closed f. Seawater filter supply valves SW20 and SW21 closed f. Open valves SW20 and SW21 g. Seawater filters clogged g. Open   dump   valve   on   filters   and   drain (paragraph 4-7.2.5) h. Piping clogged h. Unclog piping 6. Seawater not being supplied to chlorination system from seawater pumps a. Valves  SW24,  SW25,  and  SW48 closed a. Open   valves   SW24,   SW25,      and   SW48 system from seawater pumps b. Valve SW47 open b. Close valve SW47 4-5