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Thread: Grundfos JQ1 Pump Question

  1. #1
    DIY Junior Member grassyhut's Avatar
    Join Date
    Jan 2013

    Default Grundfos JQ1 Pump Question

    Hi, I have a Grundfos JQ1 pump that according to the suppliers needs a new pressure switch (Transducer).
    The pump won't start and gives 6 flashes on the red led on the control panel. I have also been told that the switch is no longer available.
    Does anyone know of any old stock. Alternatively, can this pump be modified to run continuously and use and external sensor.
    I have a reasonable knowledge of electronics so any info such as a circuit diagram or service manual would be much appreciated.

  2. #2
    Moderator valveman's Avatar
    Join Date
    Mar 2006
    Lubbock, Texas


    Sorry but I cannot find any info on a JQ1. Apparently like all variable speed pumps it was designed to make the most money for the manufacturer, not to last.

  3. #3
    DIY Senior Member zl700's Avatar
    Join Date
    Aug 2009


    I remember that pump has to be 15 years old. I used it on my cottage before I drilled a well. It was later replaced ** the JQ2&4 but those operated differently.
    12-16 years of service, time for a new one anyways.
    If Payback is so important to you, why are you not driving a Toyota Corolla?

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