TM 55-1930-209-14&P-3 Table 4-1.  ROWPU System Troubleshooting (Continued) Condition Possible Cause Suggested Action 8. Chemical metering a. Pump switch off a. Start pump at control station pumps inoperative (amber indicator light not lit)                            b. Red indicator light on     b. Replace drum (paragraph pump control panel 4-7.1.3) and prime pump comes on indicating (paragraph 4-7.1.5) chemical drum empty 9. Chemical metering                    a. Stroke length improperly    a. Set stroke length at 100 percent pump does not prime                    set b. Check valves plugged b. Clean (paragraph 4-7.1.4) 10. Chemical seeps out                   a.     Dosing head mounting a. Tighten dosing head mounting around metering pump                   loose                         screws (Table 4-3) head disc b. Diaphragm defective b. Replace (paragraph 4-8.1.2) 11. Pressure difference                 a. RO block membrane a. Clean membrane elements between gauges                         elements need cleaning        (paragraph 4-7.4) P4 and P5 exceeds 25 psi                              b. RO block membrane          b. Remove and replace elements need replacing       membrane elements (paragraph 4-8.4) 12.  Discharge dirty                     a. RO block membrane           a. Clean membrane elements at brine flow                          elements need cleaning         (paragraph 4-7.4) indicator b. Media filters need         b. Backwash and flush backwashing and               (paragraph 4-7.2) flushing 13. High -TDS                            a. Improper ratio of          a. Adjust pump engine present in water                       product water to brine speed and valve R07 sample taken at (paragraph 3-4, steps q-s) valve R09 b. RO block membrane          b. Clean membrane elements needs cleaning                (paragraph 4-7.4) 14. The pH factor                        a. RO block membrane          a. Clean membrane elements not acceptable in                      elements need cleaning        (paragraph 4-7.4) sample taken at valve R09 15. HP pump engine                       a. Valve ROl1 not fully open a. Open valve RO11 running at normal speed, but pressure                 b. Valve RO16 not fully       b. Close valve RO16 loss on pressure                       closed gauge P4                            c. Valve R07 open             c. Adjust pump engine speed and valve RO7 (paragraph 3-4, steps q-s) 16. HP pump vibrating                   a. Drive belts out of          a. Adjust (paragraph 4-7.3.11) (engine running                        adjustment                    or replace (paragraph 4-8.3.11) normally) b. Mounting bolts loose       b. Tighten bolts (Table 4-3) 4-3