Landa PHW3-11024 Operator's Manual page 23

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