72-910-02
REV. P
17
8. Trouble Shooting Guide
Symptom Probable Cause Possible Solution
Controller does not power up
No power supplied to controller Insure that correct voltage is supplied to controller.
Check circuit breaker supplying power to the
controller.
Fuse is blown Check/replace fuse (see Figure 3, Page 8)
Probe wiring incorrect Check probe wiring (see Figure 3, Page 8)
Controller powers up but
displays "Flo Err"
Insufficient flow through flow
switch
Ensure there is enough of a pressure differential
from the inlet of the flow switch and the outlet to
achieve at least 1 GPM (3.8 LPM) of flow
Flow switch not connected.
Check flow switch connections
(see Figure 3, Page 8)
Flow switch stuck. Clean flow sensor
Flow switch cap bad. Check for wire integrity or replace flow cap.
Bad shuttle. Replace shuttle
Controller powers up but
displays "Cond Err"
Loose conductivity probe wire Check probe wiring (See Figure 3, Page 8)
Bad Conductivity probe Replace probe.
Controller powers up but
displays "Lit Err"
User set Limit timer has expired Reset limit by pressing the M (Mode) button
Controller powers up but
displays "9999 Err"
Conductivity over maximum range Reduce the system conductivity.
Reset limit by pressing the M (Mode) button when
conductivity is back in range.
Probe wiring incorrect Check probe wiring (see Figure 3, Page8)
Bad Conductivity probe Replace sensor
Conductivity reading on
controller does not match a
hand-held reading.
Conductivity reading is within
specification.
Due to variations in hand-held meters, conductivity
standard solutions, temperature compensation, and
the controller’s accuracy of +/- 2% of scale, the
reading on the controller may not match that of
your hand-held tester.
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