16
TROUBLESHOOTING GUIDE
MALFUNCTION
CAUSE
REMEDY
Inability to build up
pressure…
...with high pressure
gauge fluttering.
…with loud noise from
HP-pump.
(Low pressure gauge
reads below 10”Hg)
…during navigation
…with drop in RPM
Air enters intake plumbing.
Air in intake system
High pressure pump valve
stuck after long storage time.
Seacock closed
Seacock clogged (Barnacles?)
Strainer, filter/s fouled
Through hull fitting in wrong
location (suction trough
movement).
Motor brushes worn
Tighten all hose clamps.
Allow more time to prime. If no boost pump is
installed, perform freshwater flush to assist
priming.
Open one by one all six hexagonal valve covers.
Inspect valves for movement.
Open seacock
Clean seacock
Clean strainer, change/clean filter/s.
Use strainer scoop (page 11).
Replace brushes
Pressure drops
frequently with change
of noise…
…during navigation
Air enters intake plumbing.
Air enters sea water intake
during navigation.
Tighten all hose clamps. Reseal NPT fittings.
Move through hull fitting to lower location.
Excessive leakage
between the high
pressure pump head
and crankcase…
…with water in crankcase
Worn high pressure seals
Cracked ceramic plunger
Cracked ceramic plunger
and/or worn HP/oil seals
Replace high pressure seals
Inspect for hairline crack. Replace plunger
and HP seals (page 18 / 3).
Inspect for hairline crack. Replace plunger (if
needed), high pressure seals and oil seals.
Product salinity reads
above 500ppmTDS.
Membrane element has
reached its service life time.
Replace membrane element. See instructions
on page 17.
Product output below
specification.
Low voltage or bad electrical
contact
Membrane element clogged
or reached its service life
time.
Check voltage directly at motor cables.
Clean membrane element (page 14).
Replace membrane element (page 17).
Leak on pressure vessel
end cap from salt water
…from fresh water
O-ring worn
Product port Teflon seal worn
Remove and inspect plug (page 17). Change O-
ring/s as needed.
Remove port, re-seal, install hand tight + ¼ turn
