19
Maintenance
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 flow 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 flow. Check solenoid
flow switch on machines with spray gun control, for
proper on-off fuel flow 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
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.
Plugged or dirty burner nozzle
Replace nozzle. Check parts breakdown
for nozzle size
Faulty burner nozzle spray pattern
Replace nozzle. Check parts breakdown
for nozzle size.
Heavy accumulation of soot on coils
and burner assembly
Remove coils and burner assembly, clean thor-
oughly. 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 to correct specs. See serial plate.
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
Landa PGDC Operator’s Manual 8.916-596.0 - BF
