23
Maintenance
PROBLEM
POSSIBLE CAUSE
SOLUTION
MACHINE WILL
NOT DRAW UP
DETERGENT
Clamps holding detergent lines are
loose
Tighten clamps.
Hole in detergent line(s)
Repair hole.
Strainer basket plugged
Remove and clean.
BURNER MOTOR
WILL NOT RUN
Overload protector tripped
Push reset button.
Fuel pump seized
Replace fuel pump.
Burner fan loose or misaligned
Position correctly and tighten set screw.
Defective control switch
Replace switch.
Loose wire
Check and replace or tighten wiring.
Defective burner motor
Replace motor.
EXCESSIVE
VIBRATION IN
DELIVERY LINE
Irregular functioning of check valves,
metering valves
Check and replace if necessary.
TEMPERATURE
RELIEF VALVE
LEAKS WATER
(PUMP PROTECTOR)
Spray gun in OFF position with
machine operating for an extended
period of time
Open spray gun to cool circulating water.
Relief valve defective
Replace valve.
Particle next to poppet
Remove internal parts and clean.
BURNER STAYS ON
WHEN SPRAY GUN IS
IN OFF POSITION
Fuel pump pressure too high
Readjust fuel pressure.
Pressure switch defective
Check for proper operation, replace if neces
-
sary.
Fuel solenoid defective
Replace fuel solenoid.
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
Pump sucking air
Check water supply and possibility of air
seepage.
Valves sticking
Check and clean or replace if necessary.
Unloader valve seat faulty
Check and replace if necessary.
Nozzle incorrectly sized
See serial plate for minimum nozzle size.
Worn piston packing
Check and replace if necessary.
PUMP NOISY
Air in suction line
Check water supply and connections on suction
line.
Broken or weak inlet or discharge
valve springs
Check and replace if necessary.
Excessive temperature of liquid
Reduce to below 60° C (140° F).
Foreign matter in valves
Check and clean if necessary.
Worn bearings
Check and replace if necessary.
Landa PHW Operator’s Manual 8.917-417.0 - E