Specifications

23G-Series RO System
3024270 Rev G 91 14Oct13
Troubleshooting Guide - Machine Performance
Symptom
Possible Causes
Remedies
Recovery too high.
Adjust concentrate/recycle orifices.
Membrane elements oxidized due
to chlorine break through.
Verify proper operation of pretreatment
(chlorine removal/carbon filtration). Damage is
irreversible, replace membranes.
Low rejection and high
permeate flow
(hydrolyzed
membranes)
(continued)
New membrane elements
oxidized due to cleaning and
sanitizing prior to completion of 8-
hour flush to drain procedure.
Operate machine for a minimum of 8 hours to
remove biocide and stabilize permeate. Refer
to Membrane Element Installation (Section
5.14.2).
Membrane element life expired.
Replace membrane elements (clean and
evaluate before replacing).
Concentrate membrane element
seal backward or damaged.
Reverse position or replace seal.
Excessive permeate back
pressure.
Check permeate outlet valves or inlet valves.
Concentrate flow too high.
Check to see if machine is in auto flush.
Low rejection
Inlet diaphragm valve not closing
when machine is turned off.
Clean or replace the inlet solenoid valve. Make
sure the inlet diaphragm valve stops the water
flow when shut off.
Declining rejection (or
high permeate
conductivity)
Dirty or fouled membrane
elements.
Flush, clean, and sanitize the membrane
elements.
Change in incoming feedwater
quality.
Open the concentrate valve and flush. Test the
water for pH, hardness, TDS, and iron content.
A water analysis should be sent to your
equipment supplier for review.
Conductivity or rejection
reading(s) inaccurate or sensor(s)
fouled.
Calibrate the sensors with the standard solution
or check the readings with another conductivity
meter. Check the connections between the
sensor and ECM-100 board. Check the
permeate conductivity calibration. If the
rejection reading is still not matching your
calibration with a handheld instrument sampling
feed and permeate, then check the feed
conductivity calibration. The readings are most
precise at a temperature of 77°F (25°C). Clean
and/or replace the sensors.
Check flow recovery.
O-ring seal broken or damaged.
Check the sealing surfaces on the O-ring
groove, interconnectors, and end caps.
Replace damaged parts.
Damaged membrane elements.
Replace membrane elements.