If your Premier Series Reverse Osmosis system is not producing water, has low flow from the RO faucet, or appears to be draining continuously, follow the steps below to help identify the issue.
If little to no water is coming from the RO faucet, or if water flow is slower than expected, check the following components and system conditions.
Check the FLOWLOK™ Leak Detector
The FLOWLOK™ leak detector should be checked first because it can stop water flow if the safety lever is triggered.
- Make sure the FLOWLOK™ safety lever is in the open position.
- If the lever has lifted, the system will stop water flow.
- Inspect the area for moisture, dry the tray, and reset the lever.
If the FLOWLOK™ continues to shut off water flow, check for leaks before resetting the system again.
Confirm Water Supply Valves Are Open
Verify the following:
- The feed water adapter is fully open.
- The tank ball valve on top of the storage tank is open.
- The system is connected to the cold-water line only.
The Premier Series Reverse Osmosis system cannot operate on a hot-water connection. Hot water can damage internal components and reduce system performance.
Check Tubing for Kinks or Crimps
Inspect the tubing under the sink and around the system.
- Make sure no tubing is bent, pinched, kinked, or crimped.
- Reroute any tubing that may be restricting water flow.
- Confirm tubing is fully inserted into the quick-connect fittings.
Restricted tubing can prevent water from reaching the faucet or storage tank properly.
Check Incoming Water Pressure
For standard Premier Series RO models, incoming water pressure must be between 40–75 PSI.
- If pressure is below 40 PSI, the system may not produce water properly. A booster pump may be required.
- If pressure exceeds 75 PSI, a pressure-reducing valve should be installed to help protect the system.
The AS-PR100E includes an electric booster pump and is designed for low-pressure applications. If you are using this model and still experience low or no water production, check that the pump is connected and operating properly.
If your water pressure is outside the recommended range, correct the pressure issue before continuing troubleshooting.
Check Refrigerator Connection, If Applicable
If the Premier Series RO system is connected to a refrigerator or ice maker:
- Shut off the refrigerator connection for 5–10 minutes.
- Allow the storage tank to refill.
- Restore the refrigerator connection and test again.
Excess refrigerator demand can affect tank refill timing and may make it appear that the RO system is not producing enough water.
Check Filter Age
If the filters are near or past the recommended replacement window, replace the Stage 1 sediment filter and Stage 2 carbon filter first.
Clogged pre-filters can restrict water flow to the RO membrane and reduce system production.
If water production remains low after replacing the pre-filters, the RO membrane or Stage 4 filter may also need replacement depending on system age and water quality.
Check Water Hardness
Hard water can cause scale buildup on the RO membrane and reduce system performance.
If your incoming water hardness is outside the recommended operating range, pre-treatment with a water softener may be needed to help protect the membrane.
If the system is still not producing water after completing these checks, contact Aquasure Customer Support for further assistance.
System Is Consistently Draining
It is normal for reverse osmosis systems to send some water to the drain while producing purified drinking water.
The Premier Series RO system has a low drain ratio of 1.5:1, meaning it produces approximately 1.5 gallons of purified drinking water for every 1 gallon of water sent to drain.
If the system appears to be draining excessively or continuously, use the following steps to check your system.
Confirm Incoming Water Pressure
For standard Premier Series RO models, incoming water pressure must be between 40–75 PSI.
- If pressure is below 40 PSI, production may stall and cause irregular draining.
- If pressure exceeds 75 PSI, high pressure may damage the membrane and cause steady drain flow.
The AS-PR100E includes an electric booster pump for low-pressure applications. If this model drains continuously, confirm the pump and tubing connections are installed correctly.
If your water pressure is outside the recommended range, correct the pressure issue before continuing troubleshooting.
Check Storage Tank Pressure
Improper tank pressure can affect shutoff and refill behavior.
To check the storage tank pressure:
- Turn off the water supply to the system.
- Open the RO faucet and fully drain the storage tank.
- Once the tank is empty, check pressure at the air valve.
When empty, the tank should be pressurized to approximately 8 PSI.
- If pressure is low, add air until the tank reaches the recommended pressure.
- If pressure is too high, release air until the tank is within the recommended range.
After adjusting the tank pressure, turn the water supply back on and allow the tank to refill.
Confirm the Flow Restrictor Is Installed
The drain line must include a flow restrictor.
- The flow restrictor helps create the pressure needed for the RO membrane to produce purified water.
- Without the flow restrictor, the system may not produce purified water correctly and may drain continuously.
If the flow restrictor is missing, clogged, or improperly installed, reinstall or replace it before continuing troubleshooting.
When to Contact Support
Contact Aquasure Customer Support if:
- The system is still not producing water after the valves, FLOWLOK™, tubing, pressure, and filters have been checked
- The system continues draining after checking water pressure, tank pressure, and the flow restrictor
- The FLOWLOK™ leak detector repeatedly shuts off water flow
- You are unsure whether tubing, pump connections, or drain connections are installed correctly
- You notice leaks, repeated pressure issues, or ongoing performance problems
If available, include photos of the system, tubing connections, storage tank valve, FLOWLOK™ tray, and any visible issue to help review the system more efficiently.