Kärcher HDS 4.0/32 Pe Cage Operator's Manual page 15

PRObLEM POSSIbLE CAUSE
bURNER WILL NOT Flex coupling slipping on fuel pump
LIgHT shaft or burner motor shaft
(continued from
On-Off switch defective
previous page)
Heavy sooting on coil and burner can
cause interruption of air flow 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
fLUCTUATINg Valves worn
PRESSURE
Blockage in valve
Pump sucking air
Worn piston packing
MACHINE SMOkES 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
TROUbLESHOOTINg
9.800-103.0 • REV. 1/07
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 flow. Check
solenoid flow switch on machines with spray
gun control, for proper on-off fuel flow
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 specifications.
Replace nozzle.
Replace nozzle.
Remove coils and burner assembly, clean
thoroughly.
Realign electrodes to specifications.
Check for insulation blockage or other
foreign objects.
Increase RPM.
15