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Section 10: System Troubleshooting
PROBLEM
Low Quantity of
Product Water from
Storage Tank
Low Pressure at the
Dispensing Faucet
High Total Dissolved
Solids (TDS) in the
Product Water
POSSIBLE CAUSE
Feed water saddle valve is plugged or
clogged.
Clogged sediment/carbon pre-filter.
Low water pressure.
RO membrane is fouled.
Plugged inline activated carbon post-filter.
Air pre-charge pressure in storage tank is too
high.
Air pre-charge pressure in storage tank is too
low.
Air bladder in storage tank is ruptured.
Storage tank valve is closed
No drain flow; the drain flow restrictor is
clogged.
The product water check valve is clogged.
The automatic shut-off valve is
malfunctioning.
Carbon post-filter is plugged.
Air pre-charge in the storage tank is too low.
Storage tank shut-off valve is partially closed.
The dispensing faucet is out of adjustment or
faulty.
Heavy water use, storage tank is depleted.
Low water production.
Clogged sediment/carbon pre-filter.
Low Water Pressure.
RO membrane is faulty.
RO membrane is expended.
The product water and drain water lines are
reversed.
No drain flow, the drain orifice in the
dispensing faucet is plugged.
No drain flow, drain flow restrictor is clogged.
The automatic shut-off valve is not closing.
New inline or activated carbon pre-filter not
rinsed completely.
The feed water TDS has increased.
Open valve or unclog.
Replace filters.
Feed Water pressure must be above 40 psig.
See Feed Water operating limits. Correct
cause of fouling, replace Membrane
Replace Post-Filter.
Empty water from storage tank, and with the
faucet open, adjust air pressure to 5–7 psig
(35–48 kPa) range.
Replace storage tank.
Open valve.
Clear or replace
Free check-valve or replace elbow fitting.
Replace automatic shut-off valve.
Replace post-filter.
Empty water from storage tank and with the
faucet open, adjust the air pressure to the 5-
7 psig (35-48 kPa) range.
Check for leakage at the air valve stem.
Open valve.
Repair or replace dispensing faucet.
Allow storage tank to refill (adding a second
storage tank will increase the storage
capacity).
See "Low Quantity of Product Water from
Storage Tank" above.
Replace filters.
Feed water pressure must be above 40 psig.
Check feed water valve.
Replace membrane.
If membrane life is unusually short, inspect
further and replace membrane.
See flow diagram and correct plumbing.
Clear or replace dispensing faucet.
Clear or replace drain flow restrictor.
Repair or replace the automatic shut-off
valve.
Flush with several full tanks of product water.
An increase in feed water TDS will give
corresponding increase in product water TDS.
28
SOLUTION
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