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 - D
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