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19
TROUBLESHOOTING GUIDE
Probable causes are listed with most likely cause first.
ALL Repairs should be made by qualified technicians only.
TROUBLESHOOTING GASOLINE/DIESEL ENGINES
Problem Probable Cause Remedy
Engine will not
start or crank
over.
Battery dead Where
applicable
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.
Identify, Replace or repair seized part.
Key switch, solenoid
or starter on engine
defective.
Repair or replace faulty component.
Pump is seized Replace pump or bearing.
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.
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).
Air Filter is dirty Clean or replace air filter
Old or dirty fuel Drain and replace with new fuel
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).
Incorrect nozzle in lance Replace with correct nozzle size
Unloader valve improperly
adjusted.
Adjust unloader valve
Carbon deposits on
cylinder head.
Remove head and clean off deposits.
TROUBLESHOOTING PRESSURE ISSUES
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.
(upstream injection
systems only)
Close soap valve or submerge detergent
pickup tube into solution.
Coil on hot water
machines is obstructed.
Clean obstruction or scale deposits from
coil with coil cleaner.
Pump dry, needs to be
primed.
Crack open fitting on the high pressure
outlet of the pump until water flows out.
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