TROUBLESHOOTING GUIDE

SYMPTOM

POSSIBLE CAUSES

REMEDIES

 

 

 

High operating pressure

Recycle or concentrate valve

Disassemble the plumbing to the

 

plugged

recycle valve and remove for-

 

 

eign particles. Check the con-

 

 

centrate valve stem.

 

 

 

 

Inaccurate pressure gauge

Replace or calibrate the gauge as

 

 

required.

 

 

 

 

Restricted or reduced permeate

See possible causes for low per-

 

flow rate

meate rate.

 

 

 

Excessive pressure drop

Restricted flow after pump

Check for blockage of the con-

[over 50 psig (3.4 barg)]

outlet

centrate flow at the inlets and

(high primary pressure - low

 

outlets of membrane element

final pressure)

 

housings.

 

 

 

 

Telescoped membrane element

Ensure that the anti-telescoping

 

covering membrane element

(ATD) is located properly on the

 

housing outlet port

membrane element.

 

 

 

 

Severely fouled or dirty

Flush the machine, then clean it

 

membrane elements

with detergent.

 

 

 

Water flowing when machine is

Inlet solenoid valve not closing

Clean or replace the valve.

turned OFF

or seating properly

Clean the membrane elements

 

 

with detergent immediately.

 

 

Water must not pass through the

 

 

inlet when the machine is OFF.

 

 

 

Declining rejection

Dirty or fouled membrane ele-

Flush and clean the membrane

(high permeate conductivity)

ments

elements.

 

 

 

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