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Section 9
Troubleshooting
Problem
RO system completely inactive (controls not
operating and no LEDs illuminated)
No quantity of water flowing
Low quantity of water flowing
Product water is being produced, but low or no
water is exiting out the atmospheric drain con-
nection.
"Membrane Pressure" gauge displaying good
pressures, but other gauges are showing 0 or
less than zero.
Decrease in system productivity.
9-2
Reverse Osmosis System
Possible Causes
No electrical power to RO
Blown Power Entry Fuses
Display not connected or remote display cable
is loose.
Power Supply fuse blown
Feedwater supply valve closed
Quick disconnect for feedwater not inserted
fully
Prefilter or carbon filter plugged
Inlet solenoid valve not open
Feed pressure below specification
Prefilter plugged
Carbon filter plugged
Feed pressure below specification
Flush solenoid plugged
Prefilter plugged
Carbon filter plugged
Decrease in feedwater temperature
Membrane(s) fouled
Low feedwater pressure
Low membrane operating pressure
Possible Solutions
Ensure RO power cord is installed & connected
to live power
Check/replace fuses. (Refer to fuse replace-
ment for procedure.)
Check display connection
Check/replace fuse
Open feedwater supply valve
Insert quick disconnect on feedwater into unit.
Replace prefilter or carbon filter
Replace inlet solenoid (RY1265X2)
Increase feedwater pressure
Replace Prefilter
Replace carbon filter
Increase feedwater pressure
Perform system flush (refer to "Flushing the
Membrane or Membranes" section)
Replace prefilter
Replace carbon filter
If flowrate is unacceptable, install hot/cold
water mixing valve (D7427) to elevate temp.
Replace membrane(s)
Ensure prefilter is not blocked
Increase feedwater pressure
Refer to troubleshooting of "Low or no quantity
water flowing" items.
Thermo Scientific
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