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