S – 150 Controller User Manual
MKTF – 429-A 23 08/16
TROUBLESHOOTING
CAUTION: Hazardous voltages are present when power is applied to the unit. Care should be taken
when troubleshooting any of the input power or output circuits. When disconnecting or connecting any
board or accessory, be sure power is turned off at the disconnect.
Verify the programming of all Setpoints, Check the display and check the status of all lights and
indicators. The more information available, the easier it will be to determine the source of the problem.
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 shutdown conditions active? If no, is the inlet LED, DS8 lit? If
no, replace the board. If yes, with a voltmeter, verify if there is power on the inlet terminals. Is there
power? If no, replace the board. If yes, check the valve and wiring.
RO Pump Will Not Operate
Is the system in standby? If no, are any shutdown 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.
Unit Not Flushing 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 / Conductivity 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 ‘^^^’? If no, replace board.
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