Reverse Osmosis System - Filter Light is On

It is important to distinguish which light is on. The Reverse Osmosis membrane light is on the right side of the faucet base, while the filter light is on the left side.

During normal operation, the green light, in the middle should flash when dispensing water. The filter light comes on at 6 months or 900 gallons. If the unit has been in use for six (6) months and the amber filter light is on, this indicates that it is time for a filter change. Purchase a replacement filter online.

Filter part numbers:FX12P for the PNRV12Z----comes two(2) to a packFX18P for the PNRV18Z----comes two(2) to a packIf six months have passed and the light has not come on, it is possible that:

The batteries are dead. Replace them with new ones.
The batteries have been installed backwards. Take the batteries out and follow the diagram on the batteries' case to reinstall them.
The wire connected from the battery case to the faucet may be loose. Check the wiring and make sure that the connections are tight.

If your filters are recently installed, check the batteries. The batteries need to be changed along with the filters.If the light comes on in four (4) months or less in a new home, the installer may have installed the batteries at the time of installation. Disconnect the batteries to reset the six (6) month timer. The batteries are located in a white box three (3) inches square with four (4) tubes attached to it. On the PNRV18 model box, the batteries are located in the bracket on the side of the storage tank. On the PNRV12 models it is mounted on the cabinet near the unit. To disconnect the batteries, remove the box cover and look for the snaps on each side. Remove one battery for one (1) minute, then reinstall them.

The light may be on due to a very high usage. If usage is over 5 gallons per day (probably in a commercial environment) the light may stay on. If the 900 gallon usage criteria was met before six months, and the filter light comes on, it is time to change the filters.The Premium Filtration (Reverse Osmosis) System Light Is OnDuring normal operation the green light flashes when dispensing water. The reverse osmosis light is based on the actual measurement of the water quality. When the membrane's efficiency falls below 75%, the yellow/amber light will flash, indicating that it is time to change the membrane. The membrane should provide good filtration for approximately 3-5 years.

The Premium Filtration (Reverse Osmosis) system light is on during a new installation. The Premium Filtration (Reverse Osmosis) cartridge contains a food grade preservative that has to be purged from the system before use.

Allow the unit to fill completely. It takes about 4 hours. Turn on the faucet, and completely drain the tank. Repeat this process three times.
This must be done when a new membrane is installed. The reverse osmosis' efficiency may be reduced with low usage, or when the unit has not been used for 3-4 days.
Turn on the faucet and completely empty the tank. Allow the system to refill the tank, approximately four hours.
Then check to make sure that the green light flashes when the water is dispensing. A low water pressure to the house can reduce efficiency of the Premium Filtration (Reverse Osmosis) system.
A minimum pressure for the system to work is 40 pounds per square inch. Check with your local water company or have your pressure checked by plumber. Well applications will have a pump. Check the steering or pressure gauge.

On the PNRV18 model, if the filters or membrane have been changed in the last 2 months, make sure that they were installed correctly. Refer to the Owner's Manual or video that came packed with unit for details on how to do the following:

Open the cap on the tank and check the gray rubber cap on the filter. It must be installed with the top up. The rubber cap on the filter says this side up
There is a lip seal between the filter and the membrane. It is along the inside diameter of the rubber cap. If it is pointed up along the membrane where it can be seen, it is not assembled correctly.
If either of the above is not correct, remove the filter and the membrane, correct them and reassemble them.