TROUBLESHOOTING
SYMPTOM | POSSIBLE CAUSES | REMEDIES |
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High operating pressure | Recycle or concentrate valve | Disassemble the plumbing |
| plugged | to the recycle valve and |
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| remove foreign particles. |
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| Check the concentrate |
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| valve stem. |
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| Inaccurate pressure gauge | Replace or calibrate the |
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| gauge as required. |
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| Restricted flow after pump | Check for blockage of the |
| outlet | concentrate flow at the |
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| inlets and outlets of the |
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| membrane element |
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| housings. |
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| Telescoped membrane ele- | Ensure that the |
| ment covering membrane ele- | scoping device (ATD) is |
| ment housing outlet port | located properly on the |
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| membrane elements. |
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Water flowing when | Inlet solenoid valve not clos- | Clean or replace the valve. |
machine is turned OFF | ing or seating properly | Clean the membrane ele- |
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| ments with detergent |
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| immediately. Water must |
| Severely fouled or dirty | not pass through the inlet |
| membrane elements | when the machine is OFF. |
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Declining rejection (high | Dirty or fouled membrane | Flush and clean the mem- |
permeate conductivity) | elements | brane elements. |
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