Troubleshooting - Kärcher HDS 5.0/30 Ed Operator's Manual

PROBLEM
BURNER WILL NOT
LIGHT
MACHINE SMOKES

TROUBLESHOOTING

POSSIBLE CAUSE
Disconnected or short in electrical
wiring
Burner motor thermal protector tripped
On/off switch defective
Heavy sooting on coil and burner,
can cause interruption of air flow and
shorting of electrodes
Improper electrode setting
Fuel not reaching combustion chamber Check fuel pump for proper flow. Check
Fuel solenoid malfunction
Clogged burner nozzle
Water not turned on
Flow switch malfunction
Improper fuel or water in fuel
Low fuel pressure
Air leaks in fuel lines
Plugged or dirty burner nozzle
Faulty burner nozzle spray pattern
Heavy accumulation of soot on coils
and burner assembly
Misaligned electrode
Fuel filter partially clogged
Obstruction in smoke stack
Soot build-up on coils
Lime build-up in coils
Karcher • HDS 650 • 9.800-081.0 • Rev. 5/10a
SOLUTION
All wire contacts should be clean and
tight. No breaks in wire.
If tripped, check voltage, connections and
extensions for cause. Check fuel pump
shaft rotation for binding, causing motor to
overheat.
Check continuity through burner switch.
Clean as required.
Clean and test according to diagram in
operator's manual.
solenoid flow switch on machines with
spray gun control for proper ON/OFF flow
switch.
Check by placing screwdriver inside coil
then turn machine on, open spray gun
and check for magnetic pull.
Replace.
Turn on water to activate burner flow
switch.
Remove, test for continuity and replace as
needed.
Drain tank and replace contaminated fuel.
Adjust fuel pump pressure to specifica-
tions.
Check fuel lines for leaks or air bubbles.
Tighten or replace as needed.
Replace.
Replace nozzle.
Remove coils and burner assembly. Clean
thoroughly.
Realign electrodes to specifications.
Replace as needed.
Check for insulation blockage or other
foreign objects.
Clean coils with soot remover.
Clean inside of coils using coil cleaner.
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