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Problem (cont.)
Tank not filling (low pressure
indicated by gauge.)
Low RO purity LED illuminated.
Decrease in % rejection.
Decrease in system productivity.
RO prefilter plugs rapidly.
Thermo Scientific
Possible Causes (cont.)
Feedwater supply valve closed.
RO prefilter plugged.
Solenoid valve not open.
Feed pressure below specification.
New RO membrane rinsing up.
Improperly installed RO membrane.
Fouled RO membrane.
Decrease in water temperature.
RO membrane fouled.
Low incoming water pressure.
Low RO membrane operating
High turbidity feedwater.
Action (cont.)
Open feedwater supply valve.
Replace RO prefilter.
Call Technical Services.
Increase pressure.
Continue rinse-up.
Be sure RO membrane is installed properly.
Replace RO membrane.
If decline in flow rate is unacceptable, install feedwater temperature
valve to elevate water temperature. Valve available by calling
Technical Services.
Replace RO membrane.
Be sure prefilter is not blocked. Increase incoming water pressure.
Increase operating pressure. If pressure. needed, use Thermo
Scientific accessory external pressure boost assembly.
Call Technical Services. If needed, use Thermo Scientific accessory
External Filter Assembly with gauges. This contains high volume
5 micron particulate filtering in conjunction with membrane
anti-scalant.
Section 10
Troubleshooting
EASYpure RoDi
10-3
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