Specifications

23G-Series RO System
3024270 Rev G 88 14Oct13
Troubleshooting Guide - Machine Performance
Symptom
Possible Causes
Remedies
Low operating
pressure
Pre-filters clogged.
Replace pre-filter cartridges.
Faulty pressure transducer(s),
cable(s) or connection(s) (other
pressures and flows normal).
Check terminal strip connections. Disconnect
the pressure transducer cable at the sensor
end and inspect for possible water corrosion
damage. Expose the soldered tabs to reveal a
possible short or broken connection. Take care
to avoid breaking the wires or pinching the
soldered wire end together when reinstalling
the cover onto the plug and into the sensor
body. Try plugging the pressure transducer into
other pressure transducer cables to isolate the
problem to the sensor cable. Temporarily install
a manual pressure gauge to compare readings.
Repair or replace the transducer or cable.
Insufficient feedwater pressure or
flow.
Check the feed pressure, open feedwater
valve, and check for restrictions.
Inlet diaphragm valve not
opening.
Check the inlet diaphragm valve for proper
operation.
High flow rates.
Close the machine concentrate valve (do not
close concentrate outlet valve), check the
permeate and concentrate flow rates.
Pump not operating correctly.
See pump instructions. Contact your equipment
supplier for assistance.
Low operating
pressure (cont.)
Insufficient electrical power.
Check the fuses or circuit breakers and
measure the voltage.
Pump rotating backwards (three-
phase power only).
Switch any two of the three-phase leads to the
motor starter.
High operating
pressure
Dirty or fouled membranes.
Flush, clean, and sanitize the membranes..
Recycle or concentrate orifice
plugged
Disassemble the piping to the
recycle/concentrate flow block and remove
foreign material from the machine concentrate
valve stem or orifice.
Inaccurate pressure indication.
Install a temporary manual gauge to compare
readings, and check sensor and cable as
desired for “Low Operating Pressure.” Replace
or calibrate as required.
Restricted or reduced permeate
flow rate.
See possible causes for low permeate rate.
Primary or final pressure
transducer out of calibration.
Calibrate or replace. Check transducer for
fouling.
Excessive membrane
Severely fouled or dirty
Flush, clean, and sanitize the membranes.