STP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
19
TROUBLESHOOTING
Shark STP • 97-6153 • Rev. 7/03
PROBLEM
POSSIBLE CAUSE
SOLUTION
BURNER WILL NOT
LIGHT
Disconnected or short in electrical
wiring
All wire contacts should be clean and tight. No
breaks in wire.
Burner motor thermal protector
tripped
If tripped, check voltage, connections and
extensions for cause. Check fuel pump shaft
rotation for binding, causing motor to overheat.
ON-OFF switch defective
Check continuity through burner switch.
Heavy sooting on coil and burner,
can cause interruption of air flow and
shorting of electrodes
Clean as required.
Improper electrode setting
Clean and test according to diagram in
operator's manual.
Fuel not reaching combustion
chamber
Check fuel pump for proper flow. Check solenoid
valve on machines with spray gun control for
proper on-off flow switch.
Fuel solenoid malfunction
Check by placing screwdriver inside coil then
turn machine on, open spray gun and check for
magnetic pull.
Clogged burner nozzle
Replace.
Water not turned on
Turn on water to activate burner pressure switch.
Pressure switch malfunction
Remove, test for continuity and replace as
needed.
MACHINE SMOKES
Improper fuel or water in fuel
Drain tank and replace contaminated fuel.
Low fuel pressure
Adjust fuel pump pressure to specifications.
Air leaks in fuel lines
Check fuel lines for leaks or air bubbles. Tighten
or replace as needed.
Plugged or dirty burner nozzle
Replace.
Faulty burner nozzle spray pattern
Replace nozzle.
Heavy accumulation of soot on coils
and burner assembly
Remove coils and burner assembly. Clean
thoroughly.
Misaligned electrode
Realign electrodes to specifications.
Fuel filter partially clogged
Replace as needed.
Obstruction in smoke stack
Check for insulation blockage or other foreign
objects.
Soot build up on coils
Clean coils with soot remover.
Lime build up in coils
Clean inside of coils using coil cleaner.