Kärcher 1.575-615.0 Operator's Manual page 16

PROBLEM
BURNER WILL
NOT LIGHT
(continued from
previous page)
FLUCTUATING
PRESSURE
MACHINE
SMOKES
16
TROUBLESHOOTING
POSSIBLE CAUSE
Flex coupling slipping on fuel pump
shaft or burner motor shaft
On-Off switch defective
Heavy sooting on coil and burner
can cause interruption of air fl ow
and shorting of electrodes
Improper electrode setting
Fuel not reaching combustion
chamber
Clogged burner nozzle
Thermostat faulty or slow engine
speed
Flow switch malfunction
Flow solenoid malfunction
Valves worn
Blockage in valve
Pump sucking air
Worn piston packing
Improper fuel or water in fuel
Improper air adjustment
Low fuel pressure
Plugged or dirty burner nozzle
Faulty burner nozzle spray pattern
Heavy accumulation of soot on coils
and burner assembly
Misaligned electrode setting
Obstruction in smoke stack
Low engine RPM
9.800-103.0 - M • Karcher HDS 615-617
SOLUTION
Replace if needed.
Check for electrical current reaching
burner assembly with burner switch on.
Clean as required.
Check and reset according to diagram in
Operator's Manual.
Check fuel pump for proper fl ow. Check
solenoid fl ow switch on machines with
spray gun control, for proper on-off fuel
fl ow control.
Clean as required.
Increase engine RPM to increase voltage.
Remove, test for continuity and replace as
needed.
Replace if needed.
Check and replace if necessary.
Check and replace if necessary.
Check water supply and
air seepage at joints in suction line.
Check and replace if necessary.
Drain tank and replace contaminated fuel.
Readjust air bands on burner assembly.
Adjust fuel pump pressure to specifi cations.
Replace nozzle.
Replace nozzle.
Remove coils and burner assembly,
clean thoroughly.
Realign electrodes to specifi cations.
Check for insulation blockage or other
foreign objects.
Increase RPM