TM 9-4940-342-14&P Table 5-1.  Troubleshooting - Continued Malfunction Probable Causes Corrective Action 8.   Flame failure "Red Indicator Light On". (Flame signal voltage below j.   Fuel piping broken, loose or plugged. j.   See malfunction 6, step i. 2V DC) - Continued k.  Water in fuel. k.  Obtain   fuel   sample   from   fuel   tank drain and check for water. Drain and refill fuel tank. l.   Excessive smoke. l.   Adjust     air     gate     for     proper     air combustion. m. Flame safeguard contacts dirty. m. See malfunction 2, step h. n.  Defective flame safeguard relay. n.  See  service  of  flame  safeguard  and replace safeguard. o.  Flame relay contact block mechanically bound. o.  Inspect  contact  block,  if  cocked  on guides,  free  block  to  open  and  close freely. 9.   Low nozzle pressure at gun or guns. a.  Inadequate water supply. a.  See malfunction 4. b.  Improper nozzle size on gun or guns for desired operational mode. b.  Inspect   nozzles.   Refer   to   operating instructions for correct nozzle size for desired operational mode. c.  Pump by-pass selector valve open on two gun, high pressure or 600 gph operational modes. c.  Observe   position   of   selector   valve. Close valve on two-gun, high pressure    or    600    gph    operational modes. d.  Worn vapor or rinse nozzles. d.  Remove  and  inspect  nozzles,  replace as necessary. e.  Soap agitator valve open. e.  Observe valve position, close valve. f.   Pump by-pass valve setting too low or valve leaking. f.   Turn   valve   adjusting   screw   clock- wise   to   increase   pressure.   Use   coil outlet  gage  to  set  relieving  pressure. Valve   should   be   set   at   370   psi. Excess    pressure    switch    must    be jumped  to  set  valve,  as  it  opens  at 350 psi and will shut down pump. Set valve   to   proper   relieving   pressure. Remove and disassemble valve. Inspect   valve,   seat   and   O-ring   for any    foreign    materials    or    damage. Repair    or    replace    valve    parts    as necessary. g.  Worn check valves, springs or cups in water pump. g.  Remove   pump   head   assembly   and valve assembly. Inspect valves, springs and cups for wear or damage. Replace parts as necessary. h.  Faulty bearings or loose connecting rod in pump. h.  Pump     operates     noisily.     Remove pump   and   disassemble.   Inspect   for metal shavings in crankcase. Remove and inspect connecting rods. Inspect   bearings   and   race   bearings for damage or wear. Replace or repair parts as necessary. i.   Coil outlet safety relief valve leaking. i.   Water   emitting   from   valve.   Reset, repair  or  replace  valve  as  necessary. Valve set to relieve at 400 psig. j.   Restriction in pump suction filter or suction inlet line. j.   Clean intake filter and hoses or clear restrictions. 10.  Low operating temperature. a.  Improper thermostat setting. a.  Outlet    temperature    gage    indicates low temperature. Increase tem- perature   by   turning   the   thermostat adjusting screw counterclockwise. b.  Inadequate oil supply to burner. b.  See malfunction 6. c.  Dirty or restricted burner nozzles. c.  See malfunction 9, step g. d.  Scale buildup in coil. d.  Remove   cleaning   gun   nozzles   and conduct    back    pressure    check.    If differential    pressure    between    back 32