Landa HOT Series Operator's Manual page 21

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