Service Manual Landa 2HOT • 9.808-354.0
PRESSURE W
ASHER T
roubleshooting Guide
6
PROBLEM
POSSIBLE CAUSE
SOLUTION
BURNER LIGHT
WILL NOT LIGHT
Fuel not reaching combustion cham-
ber
Check fuel pump for proper flow. Check sole
-
noid flow switch on machines with spray gun
control, for proper on-off fuel flow control.
Clogged burner nozzle
Replace.
Water not flowing through flow switch Open spray gun to allow water to flow.
Flow switch malfunction
Remove reed and test for continuity. Replace
if needed.
Fuel solenoid malfunction
Replace if needed.
UNIT SMOKES
WHILE BURNER
IS RUNNING OR
SMOKES AT
COLD-START
WHEN BURNER
IS OFF
ADJUST FOR
LOCAL
ALTITUDE,
HUMIDITY, AND
AMBIENT AIR
TEMPERATURE.
Improper fuel or water in fuel
Drain tank and replace contaminated fuel.
Improper air adjustment
Readjust air bands on burner assembly.
Low fuel pressure < 140 PSI
Adjust fuel pump pressure to specifications.
Air leaks in fuel lines
Check fuel lines for leaks or air bubbles.
Tighten or replace as needed.
Plugged or dirty burner nozzle
Replace.
Faulty burner nozzle spray
pattern
Replace nozzle.
Heavy accumulation of soot on coils
and burner assembly
Remove coils and burner assembly. Clean
thoroughly.
Misaligned electrode
Realign electrodes.
Obstruction in smoke stack while
burner is running
Check for insulation blockage or other for-
eign objects.
High fuel pressure if above 140 PSI,
when unit is cold started and burner
is off
Reduce fuel pressure, but not below 140
PSI.
LOW WATER
TEMPERATURE
Improper fuel or water in fuel
Drain fuel tank and replace with proper fuel.
Low fuel pressure
Increase fuel pressure.
Weak fuel pump
Check fuel pump pressure. Replace pump if
needed.
Fuel filter partially clogged
Replace if needed.
Soot build up on coils
Clean coils with soot remover.
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or
hot
Lower incoming water temperature.
Fuel pump pressure too high
Lower fuel pressure.
Fuel pump defective
Replace fuel pump.
Detergent line sucking air
Tighten all clamps. Check detergent line for
holes.
Defective high limit switch
Replace.
Incorrect fuel nozzle size
See exploded view parts list for proper size.
Insufficient water supplied
Check water GPM to machine.
Restricted water flow
Check nozzle for proper size or obstruction.
TROUBLESHOOTING
