PAGE 16
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/Carbon Prefilters or Activated Car-
bon Post 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 foul-
ing, replace Membrane.
Plugged 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 line Flow Restrictor is plugged. Clear or replace Flow Restrictor.
No drain flow, the drain orifice in the Air Gap Faucet is
plugged.
Clear or replace the Dispensing Faucet.
The Check Valve is stuck.
Replace elbow assembly containing check valve insert.
The Automatic Shut Off Valve is malfunctioning.
Replace ASVO.
Low pressure at the Dispensing Faucet
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 Holding Tank’s Air Valve Stem.
Holding Tank Valve is partially closed.
Open Valve.
The Dispensing Faucet is out of adjustment or faulty.
Repair or replace Dispensing Faucet.
Heavy water use, Holding Tank is depleted.
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/Carbon Prefilters or Activated Car-
bon Post 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.
Check the brine seal.
R.O. Membrane is expended.
If Membrane life is unusually short, find and correct the
problem. Replace Membrane.
The Product Water and Drain Water lines are reversed. Correct plumbing.
No drain flow, Drain Line Flow Restrictor is clogged.
Clear or replace Drain line Flow Restrictor.
No drain flow, the drain orifice in the Dispensing Faucet
is plugged.
Clear or replace Dispensing Faucet.
The Automatic Shut Off Valve is not closing.
Repair or replace the ASVO.
New Activated Carbon Post Filter not rinsed completely. Flush with several full tanks of Product Water.
The Feed Water TDS has increased.
An increase in Feed Water TDS will give a corresponding
increase in Product Water TDS.
Troubleshooting guide
Summary of Contents for 7-TFC-50
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Page 10: ...PAGE 10 Typical TFC 50 under sink installation diagram ...
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