TM 55-1930-209-14&P-2 Table 4-2.  Cooling Pump Motor Controller Troubleshooting (Cont'd) Problem Probable Cause Suggested Action 7 Thermal overload unit a. Wrong size heater a. Install correct size 8. Thermal  overload  unit  trips at too low temperature a. Wrong size heater a. Install correct size Table 4-3.  Seawater System Troubleshooting Problem Probable Cause Suggested Action 1. Seawater pump 1 not operating a. Local START/STOP switch STOP button depressed (Figure 3-1) a. Depress START button b. Station  on  OFF/ON/START  in  off position (Figure 4-1) b. Start pump c. Circuit breaker P6 on main distribution panel open (OFF) c. Close (ON) circuit breaker d. Station OFF/ON/START local START/STOP switches malfunctioning d. Troubleshoot (paragraph 4-7.2.6.2) e. Seawater pump malfunctioning e. Troubleshoot (Table 4-1) 2. Seawater pump 2 not operating a. Local START/STOP switch STOP button depressed (Figure 4-1) a. Depress START button b. Station  OFF/ON/  START  start  in OFF position (Figure 4-1) b. Start pump c. Circuit breaker P7 on main distribution panel open (OFF) c. Close (ON) circuit d. Station     OFF/ON/START     and/or local START/STOP switches malfunctioning d. Troubleshoot (paragraph 4-7.2.6.2) e. Seawater pump malfunctioning e. Troubleshoot (Table 4-1) 4-4