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TROUBLESHOOTING
Problem
No water running to
Water supply is turned off.
equipment.
Water supply is blocked.
Prefilter is plugged.
Membrane cartridge is fouled.
Incoming water line is crimped or
pinched off.
Running out of
Operating pressure reduced
optimized water
Very cold feed water
Valves are in incorrect positions
Demand exceeds system capacity
Reverse osmosis membrane fouled Replace reverse osmosis membrane every 12-24 months. See "Short
Low feed water pressure
Low TDS rejection
Inlet and outlet valve not in normal
operation
<75%
Membrane failure
Nonblended optimized
Mineral feed cartridge exhausted
water <25 ppm
18 | PENTAIR EZ-RO INSTALLATION AND OPERATION GUIDE
Possible Cause
Clear blockage.
Change prefilter.
Replace membrane cartridge.
Check incoming line and verify no crimps in line. Remove any pinch points.
Prefilters need to be replaced.
Feed water temperature too low, increase water temperature up to 80°F to
increase production with tempering valve or check if larger RO membrane or
tank can be added.
Ensure the inlet valve and outlet valve on the RO processor are open. See
hang tag for normal operation. On the tank, ensure the outlet valve is open.
Check RO permeate flow. Water temperatures of 48°F will reduce permeate
output by 50%. Inlet pressures of 30 psi will reduce permeate output by
more than 50% compared to 60 psi inlet. Consult with technical support
if permeate flow is too low. Determine if the demand is unusual or
inconsistent, or resize system with higher capacity membrane and/or tank.
membrane life" page 19 for additional information.
Install optional feed water pressure booster pump to get pressure up to 60-
80 psi. Check outlet pressure of existing booster pump if already installed.
See Hang tag for normal operation. Measure reject flow rate and compare
to reject flow restrictor chart on page 10. Replace prefilter, capillary flow
control and RO membrane as needed. When moving inlet and outlet handles
from bypass to service positions, you may detect a pressure imbalance that
prevents the outlet handle from reaching full final position. Correcting this
issue by turning the valve outlet or inlet handles open and closed again, will
help equalize pressure to allow inlet and outlet valves handles to fully engage
to the service position.
Measure TDS out of permeate sample port. Measure reject flow rate. Replace
prefilter and RO membrane as needed. Check to see if the capillary flow
control is plugged. Replace capillary flow control as needed.
Replace mineral feed cartridge with 4CM for 375 system, 7CM for 650
systems every 6–12 months.
Turn on the water.
Solution
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