21
Maintenance
PROBLEM
POSSIBLE CAUSE
SOLUTION
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 G.P.M. to machine.
Restricted water flow
Check nozzle for obstruction, proper size.
BURNER LIGHT WILL
NOT LIGHT
Disconnected or short in electrical
wiring
All wire contacts should be clean and tight. No
breaks in wire.
Burner motor thermal protector
tripped
If tripped, check voltage, connections, and
extensions for cause. Check fuel pump shaft
rotation for binding causing motor to overheat.
Flex-coupling slipping on fuel pump
shaft or burner motor shaft
Replace if needed.
ON-OFF Switch defective
Check continuity through burner switch.
Heavy sooting on coil and burner, can
cause interruption of air flow and
shorting of electrodes
Clean as required.
Improper electrode setting
Clean and test according to diagram in
Operators 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
Replace.
Water not turned on
Turn on water to activate burner flow switch.
Fuel solenoid malfunction
Remove, test for continuity and replace as
needed.
Fuel solenoid malfunction
Replace if needed.
Pressure switch malfunction
Test for proper operation. Replace if needed.
PUMP MOTOR STOPS
AFTER A FEW MINUTES
OF OPERATION OR
STARTS SLOW
Insufficient voltage
Use heavier drop cord and check voltage at
receptacle. Check name plate for amperage
draw.
Plugged nozzle
Remove and clean nozzle. Turn on water pump,
flush lines, and replace nozzle.
Wrong spray nozzle
See serial plate for minimum nozzle size.
Automatic overload switch tripped
Allow motor to cool - then push Red reset button.
Motor wet
Allow to dry.
Short in electrical wiring
Wire contacts should be clean and tight. No
breaks in wires.
Coil liming up causing excessive
pressure
See section on Preventative Maintenance.
Water pump low or out of oil causing
the pump to bind up
Fill to correct level.
Landa HOT Series Operator’s Manual 8.917-208.0 - B
