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PROBLEM
BURNER WILL
NOT LIGHT
(continued from
previous page)
FLUCTUATING
PRESSURE
MACHINE
SMOKES
WHILE
BURNER UNIT
IS RUNNING
OR
UNIT SMOKES AT
COLD-START ONLY
WHEN BURNER
IS OFF
POSSIBLE CAUSE
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
Engine altitude
Improper fuel or water in fuel
Air adjustment is improper
Fuel pressure is low <140 psi for
burner
Burner nozzle spray pattern is faulty
Faulty burner nozzle spray pattern
Coil and burner assembly have
heavy accumulation of soot
Misaligned electrode setting
Smoke stack has obstruction
Engine RPM is low
Fuel Pressure is too high for clean
burn (fuel PSI above >140 and below
200) and smokes when burner is off
Landa PDHW Service Manual 8.920-098.0 - AU
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 engine is preset for operation at altitudes
below 1000 feet above sea level. If operated at
higher altitudes, it may be necessary to adjust the
engine. 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 Call local dealer.
Realign electrodes to specifications.
Check for insulation blockage or other foreign
objects.
Increase RPM to correct specs. See serial plate.
Reduce fuel pressure PSI/Increase air band set
for cleaner without max water heat loss
Maintenance
11
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