TM 9-4940-342-14&P Section II. TROUBLESHOOTING 3-7. General (Refer to Table 3-3) a.  This     section     contains     troubleshooting     in- formation  for  locating  and  correcting  most  of  the operating  troubles,  which  may  develop  in  the  steam cleaner. Each malfunction for an individual component,  unit  or  system  is  followed  by  a  list  of tests  or  inspections,  which  will  aid  in  determining probable  causes  and  corrective  actions.  The  tests/ inspections     and     corrective     actions     should     be performed in the order listed. b.  This  manual  does  not  list  all  malfunctions  that may   occur,   nor   all   tests,   inspections   or   corrective actions.   If   a   malfunction   is   not   listed   or   is   not corrected  by  the  listed  corrective  actions,  notify  the maintenance     supervisor     and/or     refer     to     higher maintenance level. NOTE Before using table 3-3, all applicable operating checks shall be performed. Table 3-3.  Troubleshooting Malfunction Probable Causes Corrective Action 1.  Burner will not ignite. a.  Check power to unit and that main switch is not off. a.  If there is no power to unit, determine problem and correct it. Turn on the main switch. b.  On-fuel-off valve is closed. b.  Open the on-fuel-off valve at least one full turn. c.  Burner flameout not reset. c.  Reset flameout control. d.  High temperature switch not reset. d.  Reset high temperature switch. e.  Insufficient and/or wrong type of fuel e.  Change and/or add proper fuel. 2.  Low pressure at guns. a.  Inadequate water supply to pumps, a.  Check reservoir and float for proper level. Normal level is 1" to 2" below overflow pipe. b.  Inadequate water supply to equipment. b. Check water supply for capability of 650 GPH. c.  Improper size of cleaning gun nozzle or nozzle is worn. c.  Check for large or worn nozzle, as improper nozzle will cause operating pressure to decrease. d.  Soap agitator valve open, belts slipping, by-pass regulator leaking. d.  Inspect all lines for leaks and tighten as required. Check soap agitator valve, close and reset, check belts and tighten as required. 3.  Excessive operating pressure at guns. a.  Improper nozzle size on gun. Ex- cessive back pressure discharges system. a.  Nozzles are too small and will not allow proper pressure range, change to proper size. Inspect gun and hose for any restrictions. b.  Improper operational mode b.  Correct operational mode. 4.  Unit operates roughly. a.  Air dome needs draining. a.  Drain air dome. 5.  Burner cuts off too soon. a.  Fuel supply too low. a.  Replenish fuel supply. b.  Improper thermostat setting. b.  Adjust thermostat. c.  Improper operational mode. c.  Correct operational mode. 6.  Operating temperature too high. a.  Inlet air dome drain valve left open. a.  Close air dome drain valve. b.  Improper thermostat adjustment. b.  Correct thermostat adjustment. c.  Lack of water to coils. c.  Water supply off. Water pump not operating. Restriction in water supply system. d   Improper operational mode. d.  Correct operational mode. Section Ill. MAINTENANCE PROCEDURES 3-8. General The  maintenance  procedures  listed  in  this  section should    be    performed    by    the    operator    prior    to operation of the steam cleaner. 3-9. Drain air dome by opening air dome drain valve and air dome vent valve when unit is in OFF position. When completely drained, close air 15