![background image](http://html1.mh-extra.com/html/landa/mhc3-25124/mhc3-25124_operators-manual_3647870019.webp)
19
Maintenance
PROBLEM
POSSIBLE CAUSE
SOLUTION
BURNER
WILL NOT
LIGHT
Burner nozzle is clogged
Clean as required.
Thermostat has malfunctioned
Test and replace if needed.
Fuel solenoid has malfunctioned
Test and replace if needed.
MACHINE
SMOKES
WHILE
BURNER UNIT
IS RUNNING
OR
UNIT SMOKES
AT COLD-START
ONLY WHEN
BURNER IS OFF
Fuel is improper or water is in fuel
Drain tank and replace contaminated fuel.
Air adjustment is improper
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.
Coil and burner assembly have heavy accumu-
lation of soot
Remove coils and burner assembly, clean
thoroughly. Call local dealer.
Electrode setting is misaligned
Realign electrodes to specifications.
Smoke stack has obstruction
Check for blockage or other foreign objects.
Engine RPM is low
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
LOW
WATER
TEMPERATURE
Fuel is improper or has water in it
Replace with clean and proper fuel.
Fuel pressure is low
Increase fuel pressure.
Fuel pump is weak
Check fuel pump pressure. Replace pump if
needed.
Fuel filter is partially clogged
Replace as needed.
Soot buildup on coils is not allowing heat
transfer
Clean coils.
Burner nozzle is improper
Call your local dealer for proper nozzle.
WATER
TEMPERATURE
TOO HOT
Incoming water to machine is warm or hot
Lower incoming water temperature.
Fuel pump pressure is too high
Call your local dealer for proper fuel pressure.
Fuel pump is defective
Replace fuel pump.
Fuel nozzle is incorrect size
See parts breakdown or serial plate for proper
size.
Water supplied is insufficient
Check water GPM to machine.
Water flow is restricted
Check nozzle for obstruction and proper size.
Check serial plate for correct size.
PRESENCE
OF WATER
IN OIL
Oil seal is worn
Check and replace if necessary.
Air humidity is high
Check and change oil twice as often.
Packing is worn or bad
Check and replace if necessary.
DETERGENT
NOT
DRAWING
Air is leaking
Tighten all clamps. Check detergent lines for
holes.
Filter screen on detergent suction hose is
plugged
Clean or replace.
Detergent has high viscosity
Dilute detergent to specifications.
Landa MHC 9.800-950.0 - V