Problem

Probable Cause

Remedy

Engine will not start or crank over.

Battery dead.

Charge or replace battery, add electrolyte if battery is new

Dirty Battery Contacts

Clean connections

Battery cables disconnected

Connect or replace damaged cables.

Engine, pump, or gearbox is seized.

Replace or repair seized part.

Key switch, solenoid or starter on engine defective.

Repair or replace faulty component.

Engine will not start but will crank over

Engine power switch is off or defective.

Check engine power switch.

Low oil shut down is activated.

Add oil to engine, check more frequently.

Low on fuel.

Fill with the appropriate fuel, bleed injector pump on diesel engines. Bleed injector pump on diesel engines

Fuel filter is clogged.

Replace or clean fuel filter, bleed injector pump on diesel engines.

Engine flooded or starved.

Choke only as required (not applicable to diesels).

Engine bogs down under load, whenever spray gun is triggered.

Engine needs to be repaired or replaced.

See engine manual or engine dealer.

Operating in high elevation.

Lower the pressure on the unit and check for correct engine speed (RPM).

Carbon deposits on cylinder head.

Remove head and clean off deposits.

Problem

Probable Cause

Remedy

Electric motor does not start.

No electric power.

Check cord, plug, socket, and breaker.

Thermal overload in the motor/or starter has been tripped.

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.

Power switch inoperative.

Check power switch.

Electric motor or wiring failure.

Replace or repair motor and/or wiring.

No water pressure at inlet

Connect to appropriate water supply

Machine will not auto-start (if equipped)

Must have adequate water supply

25 psi minimum

Coil scale build up

Descale coil for better water flow.

Check filter screen and inlet pressure

Remove spray nozzle and pull trigger gun to check auto-start function.

Inlet flow switch defective or jammed with debris

Check mechanical function and electrical signal to relay by testing for continuity on #2 and #4 of the time delay. If no continuity with the trigger pulled replace inlet flow switch. If continuity is present, remove wires from #1 and #5 of the time delay relay and make connection between the two wires and test the machine. If the machine works replace the time delay relay. If machine does not work check and replace the contactor or motor starter.

Problem

Probable Cause

Remedy

Trigger gun leaks or will not shut off.

Debris in gun valve assembly.

Clean valve assembly or replace gun.

Pump runs but there is no spray pressure.

Water turned off.

Turn water on.

Nozzle is plugged.

Clean or replace with proper size.

Inlet chemical injection valve is open, without the end of the pickup tube inserted into detergent.

Close soap valve or submerge detergent pickup tube into solution.

Pump dry, needs to be primed.

Crack open fitting on the high pressure outlet of the pump until water flows out.

Pump runs but has low spray pressure.

Nozzle not installed.

Install proper sized nozzle.

Dual wand valve is open.

Dual wand valve must be closed and high pressure nozzle installed.

Leaky discharge hose or quick coupler.

Replace hose, quick coupler, or O-ring in the quick coupler.

Inlet strainer clogged.

Clean and check more frequently.

Worn or wrong size nozzle.

Replace nozzle of proper size.

Belt slippage

Tighten or replace with correct belt.

Unloader valve worn or improperly adjusted.

Install pressure gauge on pump head to adjust pressure. Check valve seat on Unloader.

Air leak in inlet plumbing.

Reseal fittings and inspect inlet hoses for air leaks.

Pump runs but there is erratic, fluctuating pressure.

Inadequate incoming water supply.

Increase water supply flow.

Stuck inlet or discharge valves.

Clean out or replace worn valves

Restricted inlet or air entering the inlet plumbing on the pump.

Check fittings and hose for air tight seal, clean inlet strainer screen.

Leaking H.P. seals.

Replace seals.

Leaking L.P. seals.

Pressure feed the pump and replace LP 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 or seal.

Inlet injection will not siphon chemical.

Check valve in strainer clogged.

Clean or replace. Rinse after each use.

Chemical valve not open or clogged.

Open chemical valve or clean.

Strainer not submerged in solution.

Submerge strainer and replenish chemical.

Detergent hose cut or kinked

Inspect hose, replace as necessary.

Water is emitted from the chemical pickup tube

Check valve malfunctioning.

Repair or replace check valve.

Downstream injector will not siphon chemical.

Brass knob on injector is closed.

Open by turning counter clockwise.

Unit not in low pressure mode.

Open dual wand or install low pressure tip.

Detergent hose cut or kinked.

Inspect hose, replace as required.

Strainer plugged or not submerged.

Check screen on strainer pickup tube.

Internal injector parts corroded or stuck.

Disassemble, clean or replace.

Outlet water temperature too high.

Use with cold water (150º Maximum)

Problem

Probable Cause

Remedy