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REO-PURE LP3-500 SYSTEM TROUBLESHOOTING
PROBLEM
RO SYSTEM
WILL NOT
START
Pressure or float switch defective
LOW FEED
PRESSURE
Inadequate upstream pretreatment
Pressure regulator needs adjustment
Operating pressure gauge broken
LOW
OPERATING
PRESSURE
Membrane element brine seal is folded or not
THE PUMP
DOES
NOT RUN
LOW OR NO
REJECT
WATER /
HIGH PUMP
Membrane element clogged or fouled
PRESSURE
Membrane element clogged or fouled
LOW OR NO
PRODUCT
WATER
Membrane element installed backward or brine
POSSIBLE CAUSE
No electrical power
Storage tank full
Low feed water pressure
Pump/motor malfunction
Feed water valve OFF
Low inlet water pressure
Filters clogged
Obstructed feed line
Pump impellers worn
Pump/motor coupling broken
Low water volume to pump
Malfunctioning pump
sealed against housing wall
Inlet solenoid valve not opening
Membrane element fouled
Manual flush valve open
Pump is bound
Pump/Motor coupling damaged
Restricted orifice
Clogged drain line
Operating pressure low
Water temperature too low
Product check valve damaged
Tank over - pressurized
seal damaged/rolled
SOLUTION
Check power supply
Drain portion of water out of tank
Must be minimum of 35 psi
Check, replace if necessary
Check, replace if necessary
Check, open feed water shut-off valve
Check, install booster pump if necessary
Check pressure on inlet and outlet filter pressure
gauges
Check inlet tubing
Check if sized correctly or fouled
Check and adjust if necessary.
Check, replace if necessary
Check, replace if necessary
Check, replace if necessary
Check, install booster pump if necessary
Check, replace if necessary
Check brine seal, use care when reinstalling the
membrane into the vessel
Clean solenoid valve or replace
Check, clean or replace
Close manual flush valve
Manually check pump rotation, replace if necessary.
Remove pump from motor. Check, replace if
necessary.
Check and clean
Check and clean
Check, clean or replace
Check and adjust
Check, clean or replace
Check, consult dealer if necessary
Check, replace if necessary
Check tank air pressure. Relieve to 10 PSI if
necessary
Check, use care when reinstalling the element into the
housing.
(system troubleshooting continued on next page)
LP3-500 Owner's Manual | 19
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