Another approach: Watch the Schrader valve (where you add air to the tank) as you depress the spool (the spring loaded stem in the middle that moves in and lets air in or out). If, with the RO system on, you see any water at this valve, your diaphragm/bladder has ruptured and the tank is no good.

Also, an RO system will only produce water at 7-10 psig (as indirectly indicated in the answer above), and your well or city water will normally only be pushed at between 40 and 50 psig. Cranking the tank up to 80 psig simply pushed whatever water was left in the tank out, and would not let any more in. If that water came out at a rush, your "downstream" plumbing is fine. If it came out weakly, you have an obstruction somewhere post-tank. Most RO systems are plumbed with 1/4" hard vinyl tubing, which, if it has kinked, will obstruct the flow as you're experiencing.

Check all the tubing between the tank and your faucet. If it has become kinked enough to obstruct flow, you will need to replace it.

If the water DID rush out, your upstream plumbing is the problem. As an easy visual step, check for kinked tubes as above. Since you just moved in, I'd recommend changing the pre-filter at a minimum (from the diagram for your part number, yours appears to have a pre-filter, the RO membrane, and a "polishing" filter), but it'd be best to replace all three since you don't know how long they've been in service. At best, a RO membrane will only last about 5 years; some go in as little as 6 months. The pre-filter should be changed with your furnace air filters and smoke detector batteries - every six months. The polish filter, not seeing much in the way of contaminants, should be replaced with the RO membrane.

I'm having the very same problem and having heck finding the reason online, yours is the best I've found so far, thanks!

Okay.

Here is what I would suspect at this point:
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- Incorrect air pressure in tank, or

- Clogged filters

To check air pressure:
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Empty tank and check pressure -- it should be 7 PSI.

Note: There is a rubber bladder in the tank in which the water is stored -- if this bladder is ruptured, the air pressure in the tank will not hold.

So, adjust air pressure, try system again. If it works for a while and then stops, empty tank and check air pressure for 7 PSI.

Clogged filters?
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If the system doesn't work when tank pressure is adjusted, empty tank and check pressure again. If pressure is still 7 PSI, then replace filters.

If tank pressure is not 7 PSI at this juncture, it's probably a ruptured bladder and the tank will have to be replaced. But before you take that tack we should "talk" again.


Please let me know the results...

thanks

Charlie

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P.S. I'm assuming you have adequate water pressure on your household system. You're not noticing a drop in pressure anywhere else in the house -- is that correct?