34
Unloader Valve Malfunction
PROBLEM
POSSIBLE CAUSE
REPAIR
UNLOADER
CYCLES
Fitting leaking downstream
Tighten/replace fitting.
Piston or valve spring broken or worn
Replace parts as necessary.
Clogged nozzle
Clean or replace.
FLUID LEAKING
FROM BODY
O-ring worn or cut
Replace part as necessary
UNLOADER WILL
NOT COME TO
PRESSURE
Foreign particle in valve
Replace or clean.
Nozzle worn or wrong size
Replace part as necessary.
Piston or valve worn
Replace part as necessary.
EXTREME
PRESSURE
SPIKES
Adjusting nut turned completely into
unloader
Back off adjusting nut.
Clogged nozzle
Clean or replace.
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 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 ECOS 7000 Operator’s Manual 9.801-316.0 - G
