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  1. #1
    Thailand Expat

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    problem with water pump?

    we got a new yellow mitsubishi one 6 months ago. Worked ok but now it does not come on long enough and the pressure is down, the flow is pulsed as it only comes on for less than a second at a time, then off then on again. Is there any way to get it fixed without disconnecting it and carting it back to the shop? As usual the mrs who looks after such things has lost the paperwork that came with it so I don't know if there is any sort of re set or anything you can do yourself

  2. #2
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    Bleed the air out of it.

  3. #3
    Thailand Expat poorfalang's Avatar
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    and change the pressure switch too

  4. #4
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    how to do? do you take the top off it and need a key like with a radiotor to bleed the air? Thanks for the tips

  5. #5
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    Check the suction filter to see if its plugged?

    Open the discharge side of the pump to check if the internals are plugged.

    If it was working properly what has changed in your system? Did you loose pressure?

    Did the water level go below suction level? Causes "Cavitation." Serious damage to pump.

    Re-prime the pump at the plug on top and see if this induces proper suction?

    Do what commentator's 2 AND 3 SAID.

  6. #6
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    Quote Originally Posted by xanax
    how to do? do you take the top off it and need a key like with a radiotor to bleed the air? Thanks for the tips
    There should be a plug on top? Unscrew it and pour water into it till full. Keep a beaker of water or better a hose nearby running (but not in this case as you have no flow situation to begin with) to keep the priming point full till the pump takes suction on restart. Restart the pump and open a faucet nearby to see if water pressure in present and flowing.

    Make sure your water source is full as well before starting up.

  7. #7
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    Do you have your own tank or take water directly from city supply?

  8. #8
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    direct from supply, no screw on top just flat, will take top off later when the washings done and have a look under

  9. #9
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    When its direct from supply, you may be running the pump when there's no water supply from source.

    Bad situation. You should get a reservoir/tank for water storage to insure you don't run the pump on a dry suction.

    Be sure to check the solenoid as previously mentioned. It may be damaged causing the intermittent supply/ in and out on/off of the pump.

    How are you using the pump now?

  10. #10
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    Try this first in case it just needs bleeding:

    1. Switch pump off
    2. Close valve on inlet water supply
    3. Open a downstream valve (or a tap in the house) to bleed off pressure
    4. Look for a plug on the pressure tank. Take it out.
    5. Drain the water out and replace the plug
    5. Open up the water supply
    6. Switch on the pump and see if it acts normally

  11. #11
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    job for this afternoon, I told the mrs we should get a tank but 'waste of money' was the answer! many thanks.

  12. #12
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    In my opinion a pump without a tank is a complete waste of money, a tank here is essential.

  13. #13
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    Quote Originally Posted by xanax
    job for this afternoon, I told the mrs we should get a tank but 'waste of money' was the answer! many thanks.
    Read through Dr. Andys apartment build threads. He addresses the need for a storage tank quite well there. He's on Chiang Mai's city water supply.

    All city water supplies are "Unreliable." Not news but just had to say it. I have two water storage tanks in case we have an extended shutdown of the water supply. Sometimes it lasts for 3 or more days.

    I like showers and flushing toilets. Get the holding tank and it should solve/resolve some of your problems.

  14. #14
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    Quote Originally Posted by xanax View Post
    job for this afternoon, I told the mrs we should get a tank but 'waste of money' was the answer! many thanks.
    I was referring to the pressure tank that the pump is connected to (usually right underneath the pump on the cylindrical units), not a storage tank.

  15. #15
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    where are the pressure switches and plug? I switched off the supply and turned on a tap, then loosened the round screw top left, thought that might be letting the air out but just water came out so I stopped


  16. #16
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    We have the same model, provided by the drilllers.

    Problems started day one

    They promised us money back and have since dissapeared

    Basicly they don't know what they are doing

  17. #17
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    Without a tank you are wasting your time and money. for the sake of a couple of thousand Baht you can get a two thousand litre tank that the government supply trickle fills and then your pump supplies your house from the tank. In the event of not having Government water for any reason you should still have a tank full to keep you going till it returns.
    The mrs saying no need is complete bollocks and you need to grow a set and simply tell her you are getting a tank and end of
    This can be done via SMS if you haven't the balls
    Treat everyone as a complete and utter idiot and you can only ever be pleasantly surprised !

  18. #18
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    I have the same or similar pump shown in the pic. It's really is a crap pump. After a month I changed it for another better pump. Been happy ever since.

    You really do need a supply tank.
    Your demand for water can easily outstrip mains water supply. And that is what probably/likely is the problem.

    As per the above poster, grow a set and get yourself a tank.

  19. #19
    Newbie GuttaPercha's Avatar
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    Pressure Pump

    Two things:

    - You MUST have a supply tank on the input, else the pump will suck in foul water when the mains pressure drops. This is very dangerous to your families health.

    - A true pressure pump has a large pressure cylinder which smooths out the pressure fluctuations. Lately cheap pumps have appeared which don't have a pressure tank at all. These are not Pressure Pumps, they are just intended as auto-start pumps for washing down pig-styes, etc. These cheap pumps make very poor pressure pumps, they cycle rapidly and soon burn out the switch contacts.

  20. #20
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    I thought mitsubishi were meant to be the best ones, looks like a tank next then.

  21. #21
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    Quote Originally Posted by The Big Fella View Post
    Without a tank you are wasting your time and money. for the sake of a couple of thousand Baht you can get a two thousand litre tank that the government supply trickle fills and then your pump supplies your house from the tank. In the event of not having Government water for any reason you should still have a tank full to keep you going till it returns.
    Not sure where you got yours, but as I recall, our 2,000 l hand-grenade looking tank cost us about 15,000 baht (HomePro). And that was just 2-3 months ago.

    Hopefully, they will install it, soon, around the back.



    Steve

  22. #22
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    It is not a water tank in you picketer Steve , the is a tank for wc

  23. #23
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    1000 l I paid 3600bat for 2 months

  24. #24
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    Quote Originally Posted by mfosh View Post
    It is not a water tank in you picketer Steve , the is a tank for wc
    You mean it a shit tank that gets berried in the ground.

    This is a large water tank

  25. #25
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    Quote Originally Posted by xanax View Post
    where are the pressure switches and plug? I switched off the supply and turned on a tap, then loosened the round screw top left, thought that might be letting the air out but just water came out so I stopped

    The pressure tank is the yellow part that the pump is sitting on. The drain plug will be on the side of that down near ground level.

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