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Grundfos MQ3 45

  • 29-08-2014 8:55am
    #1
    MOTM
    Registered Users, Registered Users 2 Posts: 412 ✭✭


    Hi, our Grundfos MQ3 45 is almost 8 years old and looks like it could be on its way out. The pressure sensor has been flaky for a couple of years meaning it cycles on/off/on/off even when showers etc running. But now, a couple of times this week it just cuts out and I've to reset it manually. I'm thinking 8 years is old age for this pump. Am I right?

    I want to solve this before it packs in altogether.

    So, any idea if they can be bought at a reasonable price? Alternatively, anyone suggest a good value similar pump with good reliability and where you might get it? Thanks in advance


Comments

  • #2
    Scruff
    Registered Users, Registered Users 2 Posts: 4,222 ✭✭✭Scruff


    i have this same pump too, similar age. I'd be interested in a quieter replacement in particular.


  • #3
    bourkg
    Registered Users Posts: 14 ✭bourkg


    Id get it serviced, Nothing to them really - my story below

    I have a Grundfos MQ3 -45. Today it would not start (middle of corona lock down of course). I was unable to get a plumber to assist so I decided to try an tackle the job myself.

    On a side note it was also starting about every two minutes even when there was no water flow (There is was a tap at both ends that I could turn on/off to confirm no water flow)

    When the pump was turned on it would make a sound that it was trying to turn but failing so my first assumption was that there was grit stuck in the propellers. I followed the instructions found in the following youtube: https://www.youtube.com/watch?v=yFGV2JcEm8Q

    I found no evidence that there was grit stuck in there although I did find evidence that someone had previously opened it (I moved into second hand house some time back) and had sheared off one of the screws holding the cover on. What I did notice was that when I moved the motor shaft the motor would start which indicated a bad capacitor. I managed to find a pump supplier who was willing to sell me a matching capacitor and some silicone grease.

    I re-assembled my pump and hey presto it's now working again. To my pleasant surprise, the pump is no longer starting every two minutes. I suspect the last person to open it did not grease up the o rings as shown in the video allowing the water to leak back through the pump. Also as a point to note, there is no pressure in the little tank, but its still not constantly starting when taps are not turned on.


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