21
Maintenance
BURNER WILL
NOT LIGHT
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.
Gasoline engine altitude
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.
MACHINE
SMOKES WHILE
BURNER UNIT IS
RUNNING OR UNIT
SMOKES AT
COLD-START
ONLY WHEN
BURNER IS OFF
Improper fuel or water in fuel
Drain tank and replace contaminated fuel.
Improper air adjustment
Readjust air bands on burner assembly.
Fuel pressure is low <140 psi for burner
Adjust fuel pump pressure to specifications.
Burner nozzle is plugged or dirty
Replace nozzle. Check parts breakdown for
nozzle size.
Burner nozzle spray pattern is faulty
Replace nozzle. Check parts breakdown for
nozzle size.
Heavy accumulation of soot on coils and
burner assembly
Remove coils and burner assembly, clean
thoroughly or Call local dealer.
Misaligned electrode setting
Realign electrodes to specifications
Obstruction in smoke stack
Check for insulation blockage or other
foreign objects
Low engine RPM
Increase RPM
Fuel Pressure is too high for clean burn (fuel
PSI above 140 and below 200) and smokes
when burner is off
Reduce fuel pressure PSI/Increase air band
set for cleaner without max water heat loss
LOW WATER
TEMPERATURE
Improper fuel or water in fuel
Replace with clean and proper fuel.
Low fuel pressure
Increase fuel pressure.
Weak fuel pump
Check fuel pump pressure. Replace pump if
needed.
Fuel filter partially clogged
Replace as needed.
Soot build-up on coils not allowing heat
transfer
Clean coils.
Improper burner nozzle
See Burner Specifications.
Problem
Possible Cause
Solution
Karcher Trailer 3500E HDS 4.7/35 Operator’s Manual 9.808-363.0 - B
