620-622 • 9.800-187.0 • Rev. 9/10
15
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
MACHINE
SMOKES
Improper fuel or water in fuel
Drain tank and replace contaminated fuel.
Improper air adjustment
Readjust air bands on burner assembly.
Low fuel pressure
Adjust fuel pump pressure to specification on fuel pump.
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.
Obstruction in smoke stack
Check for insulation blockage or other foreign objects.
LOW WATER
TEMPERATURE
Improper fuel or water in fuel
Drain fuel tank and replace with proper fuel.
Low fuel pressure
Increase fuel pressure.
Weak fuel pump
Check fuel pump pressure. Replace pump if needed.
Fuel filter partially clogged
Replace as needed.
Soot build up on coils
Clean coils with soot remover.
Lime build up in coils
Clean inside of coils with coil clean.
Improper burner nozzle
See parts list.
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or
hot
Lower incoming water temperature.
Fuel pump pressure too high
See specifications on fuel pump for proper fuel pres-
sure.
Fuel pump defective
Replace fuel pump.
Detergent line sucking air
Tighten all clamps. Check detergent line for holes.
Defective high limit switch
Replace.
Incorrect fuel nozzle size
See specifications for proper size.
Insufficient water supplied
Check G.P.M. to machine.
Restricted water flow
Check nozzle for obstruction, proper size.
PUMP MOTOR
STOPS AFTER A
FEW MINUTES
OF OPERATION,
OR STARTS
SLOW
Insufficient voltage
Use heavier drop cord and check voltage at receptacle.
Check name plate for amperage draw.
Plugged nozzle
Remove and clean nozzle. Turn on water pump and flush
lines, replace nozzle.
Wrong spray nozzle
See serial plate for minimum nozzle size.
Automatic overload switch tripped
Allow motor to cool - switch will automatically reset.
Motor wet
Allow to dry.
Short in electrical wiring
Wire contacts should be clean and tight. No breaks in
wires.
Coil liming up causing excessive
pressure
See section on Preventative Maintenance.
Water pump low or out of oil causing
pump to bind up
Fill to correct level.
