Problem Cause Correction
Pump running normally but
pressure does not achieve
rated values
Pump sucking air
Valves worn or dirty
Unloader packing worn
Nozzle incorrect or worn
Worn piston packing
Dirty filter
Check that hoses and fittings are air tight
Check, clean or replace
Check and replace
Check and replace
Check and replace
Check and clean
Fluctuating pressure Valves worn or stuck
Pump sucking air
Worn piston packing
Dirty filter
Check, clean or replace
Check that hoses and fittings are air tight
Check and replace
Check and clean
Pressure drops after period
of normal use
Nozzle worn
Valves worn, dirty or stuck
Unloader packing worn
Worn piston packing
Dirty filter
Check and replace
Check, clean or replace
Check, clean or replace
Check and replace
Check and clean
Pump noisy Pump sucking air
Valves dirty or worn
Worn bearings
Water top hot
Dirty filter
Check that hoses and fittings are air tight
Check, clean or replace
Check and replace if necessary
Reduce temperature
Check and clean
Presence of water in oil High humidity in air
Piston packing and oil seal worn
Check and change oil twice as often
Check and replace
Water dripping from under
pump
Piston packing worn
The o-rings of piston guide or retainer worn
Check and replace
Check and replace
Oil dripping Oil seal worn Check and replace
The motor does not start
when switched on
The plug not well connected or lack of power supply Check plug, cable and switch
When switching on the unit,
the motor hums but does
not turn on
The main voltage is insufficient, lower than the minimum
required
The pump is stuck or frozen
Incorrect extension cord
Check that the main power supply is adequate
Check, clean or replace
Check and replace
Troubleshooting
TROUBLESHOOTING CHART
P1515EPN_P1515EPWN Genpower Manual_2016.indd 18 1/5/2016 10:59:54 AM
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