PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW
QUANTITY OF
PRODUCT
WATER
FROM
HOLDING
TANK
Feed Water Valve is plugged or closed.
Open Valve or unclog.
Clogged Sediment Pre-Filter or
Activated Carbon Pre-Filter.
Replace filters.
Low water pressure.
Feed Water pressure
must be above 40 psig.
R.O. Membrane is fouled.
See Feed Water operating limits.
Correct cause of fouling, replace Membrane.
Plugged In–Line Activated
Carbon Post-Filter.
Replace Post-Filter.
Air precharge pressure in
Holding Tank is too high.
Empty water from Holding Tank,
and with the faucet open, adjust air
pressure to 5–7 psig (35–48 kPa) range.
Air precharge is too low.
Air bladder in the Holding Tank is ruptured.
Replace tank.
Holding Tank Valve is closed.
Open Valve.
No drain flow, the Drain Restrictor is plugged.
Clear or replace Drain Restrictor.
No drain flow, the drain orifice in the Dispensing
Faucet is plugged.
Clear or replace the Dispensing Faucet.
The Check Valve is stuck.
Free check.
The ASO Valve is malfunctioning.
In-Line Activated Carbon Post-Filter is plugged.
LOW
PRESSURE
AT THE
DISPENSING
FAUCET
In-Line Activated Carbon Post
Filter is plugged.
Replace Post-Filter.
Air precharge in the Holding Tank is too low.
Empty water from Holding Tank and with
the faucet open, adjust the air pressure
to 5–7 psig (35–48 kPa) range.
Check for leakage at the Air Valve Stem.
Holding Tank Valve is partially closed.
Open Valve.
The Dispensing Faucet is out of
adjustment or faulty.
Allow Holding Tank to refill (adding a second
Holding Tank will increase storage capacity).
Low Water Production.
See Low Quantity of Product Water from
Holding Tank section above
HIGH TOTAL
DISSOLVED
SOLIDS (TDS)
IN THE
PRODUCT
WATER
Clogged Sediment Pre-Filter or
Activated Carbon Pre-Filter.
Replace Filters.
Low Water Pressure.
Feed Water Pressure must be above 40 psig.
Check Feed Water Valve.
R.O. Membrane O–ring is crimped.
Check O–ring.
R.O. Membrane brine seal is not
sealing up into the manifold head.
Check the brine seal.
R.O. Membrane has expired.
If Membrane life is unusually short, find and
correct the problem. Replace Membrane.
SECTION VII. TROUBLE SHOOTING GUIDE
17
