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WP440L-Series Reverse Osmosis System
Installation Instructions and User Manual
Page | - 31 -
System Controller Troubleshooting – I-ROC150S
CAUTION: Hazardous voltages are present when power is applied to the controller. Pressing the
Power key does not remove these voltages. The power must be disconnected from the power
source. When connecting or disconnecting any wiring to the unit, be sure the power is turned off
at the disconnect or breaker.
Note:
If fuse F1 is blown, none of the outputs will operate. If fuse F2 is blown, the controller will be inoperative
.
Table 9 - System Controller Troubleshooting Guide
Problem
Corrective Action
System Inoperative
Is the yellow CPU active LED blinking? If no, is the green power LED, DS1 Lit?
If no, is the fuse OK? If no, replace the fuse. If yes, with a voltmeter, verify
power is applied to the power terminals L1 and L2. If power is applied to the
power terminals and the above checks are OK, the board is probably defective
and should be replaced. If no power is applied to the board, check the power
wiring to the system.
Display Blank
Is the green power LED, DS1 lit? If no, refer to the system inoperative section.
If yes, is the CPU active LED, DS9 blinking? If no, replace the board. If yes,
adjust the display contrast adjustment, R3. Is the display still blank? If yes,
replace the board.
Inlet Valve Will Not Operate
Is the system in standby? If no, are any shut down conditions active? If no, is
the RO LED, DS6 lit? If no, replace the board. If yes, with a voltmeter, verify if
there is power on the RO pump terminals. Is there power? If no, replace the
board. If yes, check the pump and wiring.
RO Pump Will Not Operate
Is the system in standby? If no, are any shut down conditions active? If no, is
the RO LED, DS6 lit? If no, replace the board. If yes, with a voltmeter, verify if
there is power on the RO pump terminals. Is there power? If no, replace the
board. If yes, check the pump and wiring.
No Flush or Not Flushing
Correctly
Verify that flush is enabled and what type of flush is selected. Is flush enabled?
If no, enable flush. If yes, press the Alarm Silence /Reset key for 3 seconds.
Does the unit show flush on the display? If no, replace the board. If yes, is the
flush LED, DS10 lit. If no, replace the board. If yes, with a voltmeter, verify if
there is power on the flush terminals. Is there power? If no, replace the board.
If yes, check the valve and wiring.
No or Incorrect TDS Reading
Is sensor wired correctly? If no, correct wiring. If yes, is sensor installed as
described in the installation section? If no, install correctly. If yes, verify correct
TDS / Conductivity range. Range correct? If no, correct range. If yes, calibrate
unit. Does unit calibrate OK? If no, disconnect green and white wires of sensor.
Does reading show 0? If no, replace board. If yes, reconnect wires and remove
sensor from piping and dry. Does reading show 0? If no, replace cell. If yes,
short pins of cell together. Does reading show
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? If no, replace board.