PROBLEM
PROBABLE CAUSE
(The most recurring probable cause is listed first)
REMEDY
(Repairs should only be made by a qualified technician)
Power System: Gasoline or Diesel Engine Driven
Engine will not start or crank over
Battery dead.
Dirty battery connection.
Battery cables disconnected.
Engine, pump, or gearbox is seized.
Key-switch, solenoid and starter on engine defective
Charge or replace battery, add electrolyte if battery is new.
Clean connections / Carefully check polarity.
Connect or replace damaged cables.
Replace or repair seized part.
Repair or replace.
Engine will not start but will crank over Engine power switch is off or defective.
Low oil shut down is activated.
Low water switch engaged or defective (not on all models).
Low on fuel.
Fuel filter is clogged.
Engine flooded or starved.
Check engine power switch.
Add oil to engine, check more frequently.
Add water to bulk tank feeding pressure washer.
Fill with appropriate fuel, bleed injector pump on diesel engine.
Replace or clean fuel filter
Choke only as required.
Engine bogs down under load whenever
spray gun is triggered
Engine needs to be repaired or replaced.
Operating in high elevation.
Carbon deposits on cylinder head
See engine manual or engine dealer.
Lower the pressure on the unit and check for correct engine
speed (RPM).
Remove head and wire brush deposits.
Power System: Electric Motor Driven
Electric motor does not start
No electric power.
Thermal overload in the motor or starter has been tripped.
Power switch inoperative.
Electric motor or wiring failure.
No water to inlet.
Check cord, plug, socket, and breaker.
Reset manual overload by depressing the thermal switch on
the outside of the motor or starter after the motor has cooled.
CAUTION! Automatic overload will restart the motor
automatically when it has cooled.
Check power switch.
Replace or repair motor and/or wiring.
Connect water supply.
Machine will not auto-start (if equipped
with ETS or ITS)
Must have adequate water supply.
Scale build-up in coil.
Check filter screen & inlet pressure.
Inlet flow switch defective / jammed with debris.
25 PSI minimum.
De-scale coil for better water flow.
Remove spray nozzle and pull trigger to check auto-start
function.
Check mechanical function & electrical signal to relay.
Pumping System
Trigger gun leaks or will not shut off
Debris in gun valve assembly.
Clean valve assembly or replace gun.
Pump runs but has low spray pressure Water turned off.
Nozzle is plugged or sized incorrectly.
Inlet chemical injection valve is open without the end of the
pickup tube inserted into detergent.
Coil on hot water machines is obstructed.
Priming of pump after run dry.
Turn water on.
Clean or replace with proper size.
Close soap valve or submerge detergent pickup tube into
solution.
Clean obstruction or scale deposits from coil with coil cleaner.
Crack open fitting on high-pressure outlet of pump.
Pump runs but has low spray pressure Nozzle not installed.
Dual wand valve is open.
Leaky discharge hose or quick coupler. Water sprays out
around nozzle.
Inlet strainer clogged.
Worn or wrong size nozzle.
Belt slippage.
Unloader valve worn or improperly adjusted.
Air leak in inlet plumbing.
EZ start valve is leaking.
Install nozzle.
Close dual wand valve and install high-pressure nozzle.
Replace hose, quick coupler, or o-ring in the quick coupler.
Clean and check more frequently.
Replace with nozzle of proper size.
Tighten or replace with correct belt
Install pressure gauge on pump head to adjust pressure.
Check valve seat on unloader.
Reseal fittings and inspect inlet hoses for air leaks.
Remove hose to check for internal leaks.
Pump runs but there is erratic,
fluctuating pressure
Inadequate incoming water supply.
Stuck inlet or discharge valves.
Restricted inlet or air entering the inlet plumbing on pump.
Leaking High Pressure seals
Leaking Low Pressure seals
Remove hose to check for internal leaks.
Increase water supply flow.
Clean out or replace worn valves.
Check fittings and hose for airtight seal, clean inlet strainer
screen.
Replace seals.
Pressure feed the pump and replace L.P. seals if water leaks
from the pump head.
Excessive crankshaft play or loud,
knocking noise in pump
Broken or worn bearing or connecting rod in crankcase
Replace pump or bearing.
Oil leaking from pump
Loose drain plug or damaged seal
Locate point of oil leakage and replace damaged o-ring/seal.
TROUBLESHOOTING GUIDE
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