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Grundfos MQ 3-45 keeps running

  • 02-11-2020 9:37am
    #1
    freddy99
    Registered Users, Registered Users 2 Posts: 116 ✭✭


    The MQ 3-45 is about 10 years old and pressurises the entire house water system. Over the past year the pump now runs for a long time anytime water is used (even just a small amount). It now runs for up to one minute after any water use.
    Is the check valve a likely cause for this?
    Is it worth replacing parts, or is it time to replace the pump?
    Is there any new updated version of this pump, or should i replace it with the same model?
    Thanks in advance for any help.


Comments

  • #2
    listermint
    Registered Users, Registered Users 2 Posts: 34,216 ✭✭✭✭listermint


    Is this filling an expansion tank? What's the pressure gauge say?


  • #3
    freddy99
    Registered Users, Registered Users 2 Posts: 116 ✭✭freddy99


    It’s filling an expansion tank and stainless steel hot water cylinder in the hot press. System Gauge is 3 bar


  • #4
    shane b
    Registered Users, Registered Users 2 Posts: 610 ✭✭✭shane b


    I have a grundfos MQ pump and it was doing the same thing a few years ago. Had to have the pressure/flow switch replaced.
    I found it hard to get a plumber or company to look at it and ended getting it repaired by Grundfos in Ballymount in Dublin 12 and think it cost me about 150 euro. Took about 3-4 weeks for them to do it too. I ended up buying a second hand one to tide us over and then selling it on.
    If the location suits this guy on adverts may be an easier option and buy a reconditioned pump.
    https://www.adverts.ie/plumbing-gas/grundfos-mq-pump/7932608


  • #5
    freddy99
    Registered Users, Registered Users 2 Posts: 116 ✭✭freddy99


    Thank you so much for your reply. I have decided to order a new pump and when I get it I will refurbish the original unit. It has served me pretty well.


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