Intec CV40 Instruction Manual page 28

Run Electronic Unit
Only When Pump Is ON
And water is flowing
Through the electrode
Make sure the CV10, CV40, or the CV50 light is a solid
color and not flashing. If you have a CV10 or Cv40, turn
the unit off and call Intec for a resistor that will be sent out
at no charge. If the power light is blinking rapidly on the
CV50, turn the knob counter-clockwise until the power is
light is a sold color
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