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Shows no power to the pump on computer board CU 301, have power to the system reply to; ctlibbey@yahoo.com

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Hello.

2. The pump does not

start.

The green indicator

light in the On/Off button

is on.

No alarm is indicated.

a) The CU 301, the

pressure sensor or

the pump is defective.

Check

• that the control indicator LED is flashing.

If not, the CU 301 is defective.

• that the system pressure is 7 psi below the pressure

setting.

If so, the pump is supposed to start. Open a tap to be

sure.

If the pump starts, the system is probably OK.

The system pressure can be read on the pressure

gauge.

• Refer to fault 13 to troubleshoot the pressure sensor.

If the pump has not started yet, proceed as follows:

• Press the On/Off button for 5 seconds.

If the pump starts, the CU 301 or the sensor may be

defective.

Note: The pressure is not controlled and may rise to
a high level.

Here is the operating manual in a free downloadable form: http://www.us.grundfos.com/web/Download.nsf/Pages/A69314CD588FA7BC88256CBF0067EDB8/$File/L-SP-TL-019.pdf JOE

Posted on Sep 15, 2010

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