TM 10-6640-239-13 4-15 Table 4-3  Troubleshooting - CONT MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 19. WATER PRESSURE SWITCH INOPERATIVE. Step 1.    Check that electrical power is available at the switch. Step 2.    Adjust the switch, per TM 10-4320-321-13&P. If pressure switch still inoperative, replace the switch.  See paragraph 4-38. 20. WATER CHILLER FAILS TO PRODUCE CHILLED WATER, POWER AVAILABLE. Troubleshoot per commercial manual. If failure cannot be corrected, notify direct support maintenance to replace water chiller. 21. WATER HEATER FAILS TO PRODUCE HOT WATER, POWER AVAILABLE. Check water input/output valve line up. If valve line up is correct, notify direct support maintenance. 22. SUBMERSIBLE PUMP INOPERATIVE, POWER AVAILABLE. Troubleshoot per TM 10-4320-320-13&P. If failure cannot be corrected, notify direct support maintenance. 23. GAS ALARM SYSTEM INOPERATIVE OR OPERATES IMPROPERLY. Step 1.    Calibrate per TM 10-6665-297-13&P. System will not calibrate or adjust. Step 2.    Troubleshoot system per TM 10-6665-297-13&P. If failure cannot be corrected, replace detector element and/or alarm control unit.  See paragraph 4-39. 24. DISTILLATION TEST APPARATUS INOPERATIVE, POWER AVAILABLE. Troubleshoot per commercial manual. If failure cannot be corrected, replace test apparatus.  See paragraph 4-44. 25. WATER PURIFICATION UNIT INOPERATIVE, POWER AVAILABLE. Troubleshoot per commercial manual. If failure cannot be corrected, replace water purification bath.  See paragraph 4-47. 26. CLOUD, POUR AND FREEZE POINT ANALYZER INOPERATIVE, POWER AVAILABLE. Troubleshoot per commercial manual. If failure cannot be corrected, replace cloud, pour and freeze point analyzer.  See paragraph 4-46. 27. EVAPORATION LOSS BATH INOPERATIVE, POWER AVAILABLE. Troubleshoot per commercial manual. If failure cannot be corrected, replace the evaporation loss bath.  See paragraph 4-48.