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97-6133 • Rev. 5/07
11
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
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 cham-
ber
Check fuel pump for proper flow. Check
solenoid flow switch 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 flow switch.
Flow 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 for-
eign objects.
Soot build-up on coils Clean coils with soot remover.
Lime build-up in coils Clean inside of coils using coil cleaner.