23
TROUBLESHOOTING GUIDE
Symptom (Alarm)
Possible Cause
Remedies
Low permeate flow
rate
Low operating
pressure
See the possible causes for low
operating pressure.
Dirty or fouled
membranes
Clean the membranes.
Operating on cold
water less than 55 -
60°F (13 - 16°C)
Install a hot/cold feed water
tempering valve if more permeate
flow is needed. Operate with a feed
water temperature of 72 - 77°F (22 -
25°C).
Membranes installed
backwards or
damaged concentrate
seal
Install membranes in the direction of
fluid flow. Clean the machine
immediately.
Membranes with damaged
concentrate seals should be
cleaned.
Flow meter inaccurate Check the flow rate manually with a
stopwatch and calibrated container
(such as CIP tank).
Low concentrate flow
rate, normal or higher
than normal pressure
Concentrate valve
plugged
Disassemble and the clean the
plumbing to the valve.
Concentrate outlet line
restricted
Examine the concentrate line for
obstructions or a closed valve.
Flow meter inaccurate Check the flow rate manually with a
stopwatch and calibrated container.
Note: CIP tank can be used for this
purpose.
High operating
pressure
Recycle or concentrate
lines plugged
Disassemble the plumbing to the
recycle orifice and remove foreign
particles.
Inaccurate pressure
gauge
Replace or calibrate the gauge as
required.
Service and CIP valves
closed at the same
time
Verify water path to both is open.
Restricted or reduced
permeate flow rate
See the possible causes for low
permeate flow rate.
