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  1. #1
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    Water Pump going mad

    another water pump thread

    For some reasons, the pump is on constant run, doesn't stop. It did that once, and I was told to do a purge of the pressure tank, and it should work. Maybe some dirt in the tank preventing the pump from functioning.

    Anyway did that this morning, and now the pump is still working. The problem is after 30min it gets really hot, go into a quieter mode, or just shutdown for overheating and there is no pressure.

    Not sure where to start. I closed the outlet pipe to see if the problem was a broken pipe between the water tank and the pressure tank, nothing changed. When I opened the outlet pipe, the noise was a bit different but it kept running.

    What's going ? broken pipe ? or simply water pump not functioning properly ?

  2. #2
    Days Work Done! Norton's Avatar
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    Sounds like you may have problem on input side of the pump. If for some reason the pump has lost it's prime or there is insufficient water at the input, it will continue to run until it overheats and shuts down.

    Have you tried to bleed the air from the pump?
    Whenever you find yourself on the side of the majority, it is time to pause and reflect.

  3. #3
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    Quote Originally Posted by Norton
    Have you tried to bleed the air from the pump?
    how do you do that ? and what does it mean ?

  4. #4
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    I did a purge of the pressure tank though,

    I will take a look at the manual, if it's air stuck in the pump engine, there must be a valve to take it out, will try that now

  5. #5
    Days Work Done! Norton's Avatar
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    ^PM sent.

  6. #6
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    Thanks,

  7. #7
    Have you got any cheese Thetyim's Avatar
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    Put up a picture of the pump or everyone is guessing

  8. #8
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    it's a big Fujika,

  9. #9
    Have you got any cheese Thetyim's Avatar
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    ^
    Oh great, that's a big help

  10. #10
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    Fujika GFS 355 or 455, pics coming

    I had a nice conversation over the phone with Nort, directing me what to do. Unfortunately, I "opened" the wrong "valve" and got sprinkled all over me with pressured water

    it's a big water mess,

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  12. #12
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    the big brass cover top is what I opened, but I shouldn't have

    I suspect the small brass top is the one I should have opened,

  13. #13
    Member pluto's Avatar
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    I would unplug it, and unscrew the big cap on the left. Fill it up to the rim with water, screw it back on. Turn the pump back on and wait 3-5 mins. If it still runs constantly check your holding tank to see if it is full and if the floating cut off valve(?) works. It works for me....Good Luck!

  14. #14
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    Quote Originally Posted by Butterfly
    I had a nice conversation over the phone with Nort, directing me what to do. Unfortunately, I "opened" the wrong "valve" and got sprinkled all over me with pressured water
    You didn't turn the power off first? Even Thais are more intelligent than you.

  15. #15
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    ^ of course I did, it was the remaining water in the pipes

    update: pump has been running for 25 min now,

    I suspect a damaged valve in the motor that doesn't shut it when it should

    time to call Fujika monday morning,

  16. #16
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    BF, it is probably the pressure regulating switch stuck open

    if you give the pump a hard knock it may stop, and that is the problem

    if it doesn't stop, it may still be the problem

  17. #17
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    Yes try the pressure switch.The little grey egg-cup sized thingy to the right on the picture.The top usually comes off with a cross-head screw.Mine was full of ant bits.Careful fiddling with the bits inside.And do not adjust,or not much anyway!All 250 volt in there !!!

  18. #18
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    New pressure switches are about 200 Baht. I replaced mine last week.

  19. #19
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    Quote Originally Posted by crippen
    Mine was full of ant bits.
    Had the same problem - blast with the air line from my compressor - all ok !

  20. #20
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    Please confirm you have water coming to the suction side. The large cap on the left is the priming reservoir. You did open the correct one. Always disconnect the a/c mains before fiddling with it.

    If the pump is hot it has no supply. feck all to do with pressure switch.
    Barack Hussein Obama lying polecat. Libs Only Comply With Laws They Agree With.

  21. #21
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    it's a tough call, pressure switch or something else

    I was able to "unscrew" that little top with the small brass top, it has a valve inside and it has rust, not sure what is the purpose of it and what it is supposed to do, or if it should be replaced

  22. #22
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    Quote Originally Posted by dotcom
    If the pump is hot it has no supply. feck all to do with pressure switch.
    if the pump is continually running as the pressure switch is not operating, the pump will get hot, whatever you like to think

    mine did that just last week; when we opened the tap the water came out hot too! a quick blow to the pump housing fixed it for the short term
    I have reported your post

  23. #23
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    Fujika should be there soon, will let you know what they found out

    I will kick the pump a few times and see if it works,

  24. #24
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    Fucking Fujika can't come before another day, 3 days already

    and today the fucking pump exploded !!! no water,

    I was running the pump on and off when I needed water by using a small switch. For some reason, too much pressure build up and one joint on the pump cracked !!! huge flow of water everywhere, had to turn off everything.

    I hope it didn't damage pipes with the pressure,

  25. #25
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    Ok. To answer your question. That cap covers a small reservoir used for priming. It could very well contain a non return valve - which can become stuck due to debris. That would look like a round metal plate.

    Normally you only need to prime the pump if you are sucking from a pond. This is rare, normally you have some positive head on the suction supply.

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