Landa MHP4 30324E Operator's Manual page 21

PROBLEM
BURNER Clogged burner nozzle
Thermostat faulty or slow engine speed
WILL
NOT LIGHT
Flow switch malfunction
Flow solenoid malfunction
25 Amp circuit breaker tripped
Bridge rectifier defective
12V DC relay defective
Fuel is not reaching combustion
chamber
(continued from
previous page)
Improper fuel or water in fuel
Improper air adjustment
MACHINE
Low fuel pressure, below 140 psi
SMOKES
Plugged or dirty burner nozzle
WHILE
Faulty burner nozzle spray pattern
BURNER UNIT
Heavy accumulation of soot on coils and
IS RUNNING
burner assembly
OR
Misaligned electrode setting
UNIT SMOKES AT
Obstruction in smoke stack
COLD-START
ONLY WHEN
Low engine RPM
BURNER IS OFF
High fuel pressure, if above 140 psi, when
unit is cold-started and burner is off
Improper fuel or water in fuel
Low fuel pressure
LOW
Weak fuel pump
WATER
Fuel filter partially clogged
TEMPERATURE
Soot build-up on coils not allowing heat
transfer
Improper burner nozzle
POSSIBLE CAUSE
Landa MHP Operator's Manual 8.913-925.0 - T
SOLUTION
Clean as required.
Increase engine RPM to increase voltage.
Remove, test for continuity and replace as
needed.
Replace if needed.
Push reset button.
Test and replace.
Test and replace.
Check fuel pump for proper flow. Check
solenoid flow switch on machines with spray gun
control for proper on-off flow control.
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 thor-
oughly.
Realign electrodes to specifications.
Check for insulation blockage or other foreign
objects.
Increase RPM.
Adjust fuel pump pressure down and/or adjust air
band higher
Replace with clean and proper fuel.
Increase fuel pressure.
Check fuel pump pressure. Replace pump if
needed.
Replace as needed.
Clean coils.
See specifications.
Maintenance
21