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Fix a reverse osmosis system that will not produce water

We'll check the feed valve and pressure, replace clogged filters and membrane, verify the storage tank, and tell you when to call a plumber or RO specialist.

Troubleshooting · Home plumbing
20–45 min
What you'll need
  • Replacement pre-filters and RO membrane (match your system model)
  • Filter housing wrench (if your system uses one)
  • Tire pressure gauge (to check storage tank)
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Steps

Goal: Confirm feed valve and pressure, replace filters and membrane, check the storage tank, and know when to call a plumber.

  • Check the feed valve on the cold water line—confirm it is fully open. If it was closed for maintenance, open it and wait a few minutes.
  • Good: Valve is open and water is available. Proceed to Check feed water pressure.
  • Bad: Valve was closed—open it and retest.

Check feed water pressure

Goal: Confirm adequate pressure for the RO system.

  • RO systems typically need 40–80 psi. If you have a pressure gauge, check the feed line. Low pressure reduces or stops production.
  • Good: Pressure is in range. Proceed to Replace pre-filters.
  • Bad: Pressure below 40 psi—a booster pump may be needed. Call a plumber or RO specialist.

Replace filters and membrane

Goal: Replace clogged pre-filters and a fouled membrane.

  • Replace pre-filters (sediment and carbon) if overdue—often every 6–12 months. Shut off the feed valve, relieve pressure by opening the RO faucet, then replace filters.
  • Check the drain line (waste) is not kinked or blocked. If waste water cannot flow, the system may stop producing. Confirm water flows to the drain when the RO runs.
  • If pre-filters are new but output is still low or zero, replace the membrane (typically every 2–3 years). Remove the membrane housing, pull out the old membrane, insert the new one with flow direction correct (usually o-rings toward the inlet), and reassemble.
  • Flush the first few gallons after replacing parts. Replace the post-filter (after the tank) if overdue—a clogged post-filter can reduce faucet flow.
  • Good: System produces water at the faucet.
  • Bad: Still no water—proceed to Check storage tank.

Check storage tank

Goal: Verify the storage tank bladder is intact.

  • Shut off the feed valve. Open the RO faucet to drain the tank. Disconnect the tank from the system.
  • Check air pressure at the Schrader valve with a tire gauge—should be 7–8 psi when empty. If the tank will not hold pressure or water comes out the air valve, the bladder is ruptured. Replace the tank.
  • Good: Tank holds pressure. Reconnect, open the feed valve, and test.
  • Bad: Tank ruptured—replace the tank or call a plumber.

When to get help

Call a plumber or RO specialist if:

  • Feed pressure is very low and you cannot fix the supply.
  • The storage tank will not hold pressure and you cannot replace it.
  • You have replaced filters and membrane and the system still produces no water.
  • You have a well system or complex plumbing.

Verification

  • Water flows from the RO faucet at normal rate.
  • The storage tank fills when the faucet is closed.
  • No unusual noises or leaks at the system.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Feed valve and pressure Confirm feed valve is open and pressure is adequate (40–80 psi).
  2. Replace pre-filters Replace sediment and carbon pre-filters if overdue.
  3. Replace RO membrane Replace membrane if old (2–3 years) or pre-filters are good but output is low.
  4. Check storage tank Verify tank holds pressure; replace if bladder is ruptured.
  5. Call a plumber Low pressure, tank will not hold pressure, or system still produces no water after parts replacement.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • RO system model
  • Feed pressure (if known)
  • Filter and membrane replacement dates
  • Storage tank pressure when empty
  • Steps already tried

Is the feed valve open and pressure adequate?

RO systems need the feed valve open and typically 40–80 psi. Low pressure reduces or stops production.

Check the feed valve on the cold water line—confirm it is fully open. Check pressure if you have a gauge (40–80 psi typical). Good: valve open and pressure adequate. Bad: valve was closed—open it and wait. Low pressure: call a plumber or RO specialist for a booster pump.

Yes No

You can change your answer later.

Are pre-filters and membrane overdue?

Pre-filters every 6–12 months; membrane every 2–3 years. Clogged filters block flow.

Check replacement dates. Replace pre-filters if overdue. If pre-filters are new but output is still low, replace the membrane. Shut off feed valve, relieve pressure, replace parts, flush. Good: new filters and membrane; system produces water. Bad: still no water—check storage tank.

Yes No (recently replaced)

You can change your answer later.

Replace filters and membrane, then test

Replace pre-filters and membrane per your system. Flush the first few gallons. Good: system produces water. Bad: still no water—check storage tank or call a plumber.

Done

Does the storage tank hold pressure?

A ruptured bladder stops production. Drain tank, check air pressure at Schrader valve (7–8 psi when empty).

Shut off feed valve. Drain the storage tank. Disconnect tank. Check air pressure at Schrader valve—should be 7–8 psi when empty. If tank will not hold pressure or water comes out the air valve, bladder is ruptured—replace tank. Good: tank holds pressure—reconnect, open valve, test. Bad: tank ruptured—replace or call a plumber.

Yes No (ruptured)

You can change your answer later.

Reconnect tank and test

Reconnect the storage tank. Open the feed valve. Let the system fill. You should see water at the RO faucet. If not, call a plumber or RO specialist.

Done

Call a plumber or RO specialist

Call a plumber or RO specialist if feed pressure is very low, the storage tank will not hold pressure, or you have replaced filters and membrane and the system still produces no water. Well systems or complex setups may need a pro.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would an RO system stop producing water?
Common causes: closed feed valve, clogged pre-filters, failed or fouled membrane, or a ruptured storage tank bladder. Pre-filters and the membrane need periodic replacement. Low feed pressure or a bad tank also reduces or stops output.
Can I fix an RO system that will not produce water myself?
Yes. Most issues are fixable by opening the feed valve, replacing filters and membrane, or checking the storage tank. Shut off the water and relieve pressure before replacing parts. If you are unsure about pressure or tank diagnosis, call a plumber or RO specialist.
When should I call a plumber for an RO system?
Call a plumber or RO specialist if feed pressure is very low and you cannot fix the supply, the storage tank will not hold pressure, or you have replaced filters and membrane and the system still produces no water. Complex plumbing or well systems may need a pro.

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