TM 10-4610-232-12 SECTION IV.  TROUBLESHOOTING 4-7. INTRODUCTION.  Table 4-2 lists common malfunctions during operation and maintenance which require unit maintenance level personnel to perform maintenance and checks of the ROWPU or its parts. 4-8. TROUBLESHOOTING CHART.  The troubleshooting chart lists Malfunction, Test or Inspection, and Corrective Actions.  Tests, inspections, and corrective action should be made or taken in the order listed. SYMPTOM INDEX MALFUNCTION PAGE ROWPU ASSEMBLY 4-13 RAW WATER PUMP ASSEMBLY 4-14 SEPARATORS 4-16 BOOSTER PUMP 4-16 BASKET STRAINER 4-18 CLEAN/FLUSH TANK 4-19 MEDIA FILTER AIR BLANKET LEVEL INDICATOR 4-19 MEDIA FILTER 4-19 CARTRIDGE FILTER 4-21 PRESSURE GAGES 4-22 FEED LOW PRESSURE SWITCH 4-22 TURBIDITY METER PANEL DELETED PORTABLE TURBIDITY METER 4-24 HYPOCHLORITE BACKWASH PUMP 4-24 HYPOCHLORITE MIXER 4-24 CHEMICAL PUMPS 4-25 WASTE RELIEF AND PRODUCT RELIEF VALVE 4-25 SAFETY VALVE 4-26 PRODUCT VENT VALVE 4-26 HIGH PRESSURE RELIEF VALVE 4-26 AUTOMATIC ACTUATED BUTTERFLY VALVES 4-26 PRODUCT HIGH PRESSURE SWITCH 4-27 AIR SYSTEM 4-27 AIR COMPRESSOR 4-29 HIGH PRESSURE PUMP 4-30 UNUSUAL NOISE 4-32 HIGH PRESSURE PUMP ASSEMBLY STABLE LEVELS 4-33 DISTRIBUTION PUMP 4-33 MALFUNCTION PAGE DIESEL HEATERS 4-34 NBC FILTER 4-34 ELECTRICAL TROUBLESHOOTING 4-34 SAFETY VALVE 4-37 HYPOCHLORITE MIXER 4-37 TDS METER DELETED ELECTRIC HEATER 4-38 PUMP HEAT LAMP 4-40 POWER SUPPLY 4-41 TURBIDITY METER DELETED ALARM CIRCUITS 4-42 PRESSURE SWITCHES 4-43 LEVEL SWITCHES 4-46 VENT FAN 4-48 CHEMICAL PUMPS 4-49 AUTOMATIC VALVES 4-51 BOOSTER PUMP 4-60 HIGH PRESSURE PUMP 4-63 RAW WATER PUMP 4-64 CIRCUIT BREAKERS 440 VAC 4-67 CARBON MONOXIDE (CO) MONITOR 4-68 DIESEL HEATERS 4-68 AIR BLOWDOWN SOLENOID 4-73 FLOWMETERS 4-73 AIR COMPRESSOR 4-73 VAN LIGHTS 4-75 MEDIA FILTER 4-76 AUXILIARY POWER 4-79 SUMP HEATER 4-79 UTILITY CIRCUITS 4-79 DISTRIBUTION PUMP 4-80 Change 12  4-12.1/(4-12.2 blank)