Kärcher 1.103-843.0 Operator's Manual page 21

Problem
Clogged burner nozzle
Thermostat faulty or slow engine speed
BURNER WILL
NOT LIGHT
Flow switch malfunction
Flow solenoid malfunction
Valves worn
Blockage in valve
Pump sucking air
Worn piston packing
FLUCTUATING
PRESSURE
Gasoline engine altitude
Improper fuel or water in fuel
Improper air adjustment
Fuel pressure is low <140 psi for burner
Burner nozzle is plugged or dirty
MACHINE
SMOKES WHILE
Burner nozzle spray pattern is faulty
BURNER UNIT IS
RUNNING OR UNIT
Heavy accumulation of soot on coils and
SMOKES AT
burner assembly
COLD-START
Misaligned electrode setting
ONLY WHEN
BURNER IS OFF Obstruction in smoke stack
Low engine RPM
Fuel Pressure is too high for clean burn (fuel
PSI above 140 and below 200) and smokes
when burner is off
Improper fuel or water in fuel
Low fuel pressure
Weak fuel pump
LOW WATER
TEMPERATURE
Fuel filter partially clogged
Soot build-up on coils not allowing heat
transfer
Improper burner nozzle
KÄRCHER TRAILER OPERATORS MANUAL • 9.807-794.0-B
Possible Cause Solution
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.
The gasoline engine is preset for operation
at altitudes below 1000 ft above sea level. If
operated at higher altitudes, it may be
necessary to install a high altitude main jet in
the carburetor. Contact your local authorized
engine sales and service center for details.
Drain tank and replace contaminated fuel.
Readjust air bands on burner assembly.
Adjust fuel pump pressure to specifications.
Replace nozzle. Check parts breakdown for
nozzle size.
Replace nozzle. Check parts breakdown for
nozzle size.
Remove coils and burner assembly, clean
thoroughly or Call local dealer.
Realign electrodes to specifications
Check for insulation blockage or other
foreign objects
Increase RPM
Reduce fuel pressure PSI/Increase air band
set for cleaner without max water heat loss
Replace with clean and proper fuel.
Increase fuel pressure.
Check fuel pump pressure. Replace pump if
needed.
Replace as needed.
Clean coils.
See Burner Specifications.
Maintenance
21