Reverse Osmosis - Reasons For Having Little or No Water

Below are some reasons why you may have little or no water from a Reverse Osmosis system. All of these reasons may not apply to all models. Please see the Owner's Manual for model specific information.


The Saddle Valve Is Not Turned On:

  • Locate the saddle valve on the cold water inlet line. Turn the valve counter-clockwise to turn the water on.


The Storage Tank Is Not Turned On:

  • On the PNRV18 model, locate the red tear drop knob on top of the tank. Turn it up so that it points towards the filter.

  • On the PNRV12 model, the white tank is remote from the unit. Locate the blue knob on top of the tank and turn it so that it points towards the tubing.


High Usage:

  • The water pressure decreases as the tank gets near empty since the reverse osmosis filter produces water at a slow rate. It takes 4 hours to produce 2 gallons of water. In the PNRV18 model, the tank holds approximately 1.5 gallons and in the PNRV12 model it holds approximately 2.1 gallons. Allow 4 hours for the tank to fill and try again.


Incorrect Air Pressure In The Storage Tank:

  • For the PNRV18 model only, turn on the faucet and allow the tank to empty completely. Turn the red shut-off valve to the off position. Disconnect the post filter at the shut-off valve. Hold a container at the shut-off valve, turn on the valve and let it drain. Locate the air valve which looks like a valve on a bicycle tire, under the green cap, press down in the center of the valve and hold down until all the water has been drained. Reconnect the post filter and turn on the saddle valve.

  • PNRV12 models require service.


Low Flow From The Faucet:

  • A low initial flow rate is usually caused by clogged filters. You can solve this problem by changing your filters.

  • If a low flow reoccurs in 6-8 weeks after installing the new filters, the problem is most likely to be caused by poor quality of the incoming water (debris, iron, etcetera). It is suggested that you have your water tested. Contact your local water company.

  • Please note that the flow will not be the same as a regular faucet. The normal flow from the reverse osmosis faucet should be at least one quart per 40 seconds. To test this, get a quart jar and time how long it takes to fill the quart jar.

  • If it's a new installation in a new home, the filters may be clogged with debris from the pipes or a high level of sediment. You can solve this problem by changing your filters.


Low Household Water Pressure:

  • The minimum water pressure for the system to work is 40 Pounds Per Square Inch. Check with your local water company or have it checked up by a plumber.