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Problem Cause Solution Notes Unit Runs Low or Out of Water Low Feed Water Pressure Repair Beverage Booster Pump/System Contact Dealer Add FlashgARD Booster Pump Assembly Only if Beverage Booster System is not installed RO Membrane Fouled Replace RO Module and SFC Tubing (Stealth Flow Control) Feed Water Pressure, Temperature, RO Module Flow Rate and Reject Water should be checked Storage Tank Air Charge is Low Drain Tank using Sample Valve, with Sample Valve Open, Pump- up Air Charge, 8 -10 psi (55.2 - 68.9 kPa), close Sample Valve Unscrew Blue Cap to access Schrader Air Valve Pre-Filter is Plugged by Sediment (Particles)Replace Pre-Filter A more frequent Pre-Filter change-out schedule may be needed Slow Leak in the Distribu- tion Line Repair Leak The unit produces filtered water slowly. A dripping leak can prevent the tank from filling Unit Never Shuts Off (Continually Runs to Drain) RO Membrane Partially Fouled, Unit can not pro- duce enough water to keep up the demand Replace RO Module and SFC Tubing (Stealth Flow Control) High levels of hardness minerals may be present in feed water, monitor reject flow for plugging Product Water Check Valve has failed allowing storage tank flow to drain after unit is shut off Check Reject Water flow to drain in the morning. Unit should be off and no flow to drain. If flow to drain exists, turn off the feed water valve and check for flow to drain on 10 minutes. If the flow to drain remains steady, replace RO Module Reject Water flow to drain should stop when the feed water valve is off Hydraulic Shut-off Valve has failed Replace valve Should only be performed by a quali- fied technician Troubleshooting Guide Limited Warranty CUNO Incorporated warrants this Product (excluding disposable filter cartridge(s) and RO membrane cartridge(s)) to be free from defects in material and workmanship for two years from the date of purchase. The disposable cartridge is warranted from defects in material and workmanship for a period of one year from the date of purchase. The RO cartridge is warranted from defects in material and workmanship for a period of two years from the date of purchase. This warranty does not cover failures resulting from abuse, misuse, alteration or damage not caused by CUNO or failure to follow installation and use instructions. If the Product is defective CUNO will replace the Product or refund your Product purchase price. CUNO will not be liable for any indirect, special, incidental, or consequential damages arising from the use of this Product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation may not apply to you. To obtain warranty service, mail your request to Warranty Claims, CUNO Incorporated, 400 Research Parkway, Meriden, CT 06450. Proof of purchase (original sales receipt) must accompany the warranty claim, along with a complete description of the Product, model number and alleged defect. This warranty gives you specific legal rights and you may have other rights which vary from state to state, or country to country. 9