22
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
Readjust 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 GPM to machine.
Restricted water flow
Check nozzle for obstruction and proper size.
PUMP MOTOR
STOPS AFTER A
FEW MINUTES OF
OPERATION OR
STARTS SLOW
Insufficient voltage
Use heavier drop cord and check voltage at recep
-
tacle. Check name plate for amperage draw.
Plugged nozzle
Remove and clean nozzle. Turn on water pump and
flush lines, replace nozzle.
Wrong spray nozzle
See serial plate for minimum nozzle size.
Automatic overload switch tripped
Allow motor to cool - switch will automatically reset.
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.
RELIEF VALVE
LEAKS OR
SPRAYS OUT
WATER
Spray nozzle plugged
Remove nozzle and clean out obstruction.
Mis-adjusted or defective relief valve Adjust or replace as needed.
Scale or dirt plugging inside of coils See "Preventative Maintenance Cleaning of Coils."
DETERGENT NOT
DRAWING
Air leak
Tighten all clamps. Check detergent lines for holes.
Detergent metering valve packing
not tight or packing worn
Tighten nut. Replace valve or packing.
Filter screen on detergent suction
hose plugged
Clean or replace.
Dried up detergent plugging metering
valve or injector
Clean and flush.
Restrictor in float tank missing
Install restrictor.
High viscosity of detergent
Dilute detergent to specifications. Read detergent
label.
Landa PHW Operator’s Manual 8.917-417.0 - E
