Labconco WaterPr RO Systems 90750 Series - Manuel (Page 36)

Chapter 6: Troubleshooting
32
Original Instructions
PROBLEM CAUSES CORRECTIVE ACTION
Reduced flow at
dispense valve/gun
and storage tank
slow to fill Restricted tube in the feed line or
polishing system Inspect polishing loop tubing
for any restrictions
Insufficient feed water pressure and
flow rate Pressure must be a minimum
of 30 psi at a flow rate of at
least 6 liters per minute
Check inline strainer for
obstruction
Partial open feed valve Open feed valve fully
Plugged prefilter and/or carbon filter Replace filters
Water temperature less than 25°C Install water temperature
mixing valve
Kinked or restricted tubing in system Trace restriction and remove
or straighten tube
Decrease in RO back pressure Increase back pressure relief
valve to 150 psi
Water quality
display acting
erratically New cartridges installed in system Purge all of the air out of the
polishing system
Air trapped in conductivity cell Purge all of the air out of the
RO system
Polishing loop conductivity cell not
connected to wiring harness Reconnect cell to wiring
harness
Conductivity cell is defective Replace cell
Display reads 000 Conductivity sensor disconnected
from harness Connect sensor to harness
from circuit board
Air in conductivity sensor Purge unit until air is expelled
by opening the dispensing
valve