Reverse Osmosis RO Systems Troubleshooting Guide

Not Enough Water, Low Water Pressure From Faucet, Product Water TDS Is Too High, Bad Taste In Water.

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Reverse Osmosis Systems Troubleshooting Guide

This Guide should help with most of your RO Troubleshooting questions. If this Guide does not answer your questions or you are still unsure of what may not be operating properly, please use our Contact Form and let us know.

 
Not Enough Water/No Water From Holding Tank
Please watch our video on How To Service The Reverse Osmosis RO Holding Tank.
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Possible Cause
Solution
Feed water valve is plugged or closed. Open valve or unclog.
Sediment/Carbon prefilter or Carbon Post Filter is clogged. Replace Filters.
Low incoming water pressure. Incoming water pressure must be above 40 PSI. Install a Booster Pump or Permeate Pump.
Reverse Osmosis Membrane is fouled. Make sure incoming water pressure is within operating limits. Make sure drain line is not clogged. (See High TDS) Correct cause of fouling and replace RO Membrane.
Air pressure in holding tank is incorrect. Empty water from holding tank. Air pressure in valve stem should be between 7 - 8 PSI.
Air Bladder in Holding Tank is ruptured. Replace Holding Tank.
Holding Tank valve is closed. Open valve.
No water to drain. Drain Flow Restrictor is clogged. Replace Drain Flow Restrictor.
No water to drain. Air Gap Faucet is clogged. Clear or replace Air Gap Faucet.
Check Valve on RO Membrane Housing is stuck. Replace Check Valve.
The Automatic Shut-Off Valve is Malfunctioning. Replace Automatic Shut-Off Valve.
 
Low Water Pressure From Dispensing Faucet
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Possible Cause
Solution
Air Pressure in Holding Tank is incorrect.

This is the #1 reason for low flow from Reverse Osmosis Faucet.

Please watch our video on How To Service The Reverse Osmosis RO Holding Tank.

Open faucet and empty water from holding tank. Shut off feed water to system and remove holding tank from under sink. (The tank is easier to work on.) 

Locate the air valve stem (just like on a car or bicycle tire) and add air. If there is still water in the tank, continue to add air until all the water is removed. 

Once all the water is removed, continue to add air and pressurize to 8 PSI. 

Re-install the tank under the sink, turn on the feed supply to the system and allow the tank to fill. 

Carbon Post Filter is clogged. Replace Post Filter
Holding Tank Valve is partially closed. Open Valve.
The Faucet is out of adjustment or faulty. Repair or replace Faucet.
Heavy water use. Holding Tank is empty. Allow Holding Tank to refill.
Low Water Production. See previous section on Low Quantity of Water From Holding Tank.
 
Product Water is High in Total Dissolved Solids (TDS)
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Possible Cause
Solution
Clogged Prefilter. Replace Filter.
Low incoming water pressure. Incoming water pressure must be above 40 PSI. Install a Booster Pump or Permeate Pump.
Reverse Osmosis Membrane is not correctly sealed in Membrane Housing. Check that RO Membrane is correctly installed.
Reverse Osmosis membrane is expended. If Membrane life is unusually short, find and correct the problem. (Average life is 2 - 3 years.) Replace RO Membrane.
Product water and drain water lines are reversed. Correct plumbing.
No water to drain. Drain Flow Restrictor is clogged. Replace Drain Flow Restrictor.
No water to drain. Air Gap Faucet is clogged. Clear or replace Air Gap Faucet.
The Automatic Shut-Off Valve is not closing or diaphragm has ruptured. Repair or replace Automatic Shut-Off Valve.
New Carbon Postfilter has not been rinsed completely. Drain Holding Tank twice to rinse new Carbon Postfilter.
The incoming feed water TDS has increased. An increase in feed water TDS will also give an increase in Product Water TDS.
 
Tastes and Odors in Product Water
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Possible Cause
Solution
Carbon Post Filter is exhausted. Replace Filter.
There is foreign matter in Holding Tank. Clean, flush and sanitize the Holding Tank. Replace filters.
Product water and Drain water lines are reversed. Correct plumbing.
Dissolved gases in feed water. Pretreat feed water to remove gasses.
Increase in Product Water TDS. See High TDS in Product Water Section
 
Drain Water Overflows at the Air Gap Faucet
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Possible Cause
Solution
Air Gap is clogged. Clear Air Gap
Drain line is clogged. Clear tubing.
Drain flow rate is too high. Replace Flow Restrictor.
 
Optional Water Quality Monitor Light Is On
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Possible Cause
Solution
System has not been used for an extended period of time. Drain Holding Tank and allow to refill. Check again.
Reverse Osmosis Membrane is fouled or exhausted. Replace filters and RO Membrane.
 
Faucet Leaks or Drips
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Possible Cause
Solution
Water leaks from faucet spout. Adjust faucet by turning the tee bar located under the handle to provide a small amount of free play in the handle when shut off. Should this not work, repair or replace the faucet.
Leaks from beneath the handle. Repair or replace the faucet.
 
 


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