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  1. #1
    Join Date
    Jun 2017
    Posts
    142

    Default Domestic water pump gone mad

    Can anyone suggest what might be wrong. The water pump doesn’t switch off after the accumulator should be full and keeps running without stopping even if the taps are all off.

    I am assuming that this doesn’t do the pump any good either. What could be wrong?

  2. #2
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,056

    Default Re: Domestic water pump gone mad

    Quote Originally Posted by Homer J View Post
    Can anyone suggest what might be wrong. The water pump doesn’t switch off after the accumulator should be full and keeps running without stopping even if the taps are all off.

    I am assuming that this doesn’t do the pump any good either. What could be wrong?
    If it seems to pump Ok and develop a good discharge pressure a defective cutout pressure switch is the most likely.

    If its not getting up to its normal pressure dirty or defective valves in the pump are a likely cause .

    Dirt in the valves should not be problem though if you have an inlet strainer.

    If the system does not maintain pressure in the accumulator when the pump is switched off then dirty/ defective pump valves

    All assuming no major leaks, off course, filling the bilges
    Last edited by VicS; 14-04-19 at 08:49.

  3. #3
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    18,324

    Default Re: Domestic water pump gone mad

    If the water runs out properly when the tap is opened that the pressure cut-off switch on the pump must have failed. Strip down the pump and see if it can be replaced separately.

    Richard

  4. #4
    Join Date
    Sep 2017
    Posts
    641

    Default Re: Domestic water pump gone mad

    Quote Originally Posted by VicS View Post
    If it seems to pump Ok and develop a good discharge pressure a defective cutout pressure switch is the most likely.

    If its not getting up to its normal pressure dirty or defective valves in the pump are a likely cause .

    Dirt in the valves should not be problem though if you have an inlet strainer.

    If the system does not maintain pressure in the accumulator when the pump is switched off then dirty/ defective pump valves

    All assuming no major leaks, off course, filling the bilges
    Accumulator diaphragm ????

  5. #5
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    18,324

    Default Re: Domestic water pump gone mad

    Quote Originally Posted by Old Harry View Post
    Accumulator diaphragm ????
    The system would still reach max pressure eventually .... or spray out water .... and the pump would stop.

    Richard

  6. #6
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,056

    Default Re: Domestic water pump gone mad

    Quote Originally Posted by Old Harry View Post
    Accumulator diaphragm ????
    No, because eventually the accumulator would fill with water, all but a small air space, and the pump would then cut out

  7. #7
    Join Date
    Oct 2006
    Location
    Bradwell and Leigh-on-Sea
    Posts
    14,361

    Default Re: Domestic water pump gone mad

    Mine does that sometimes if I have run dry and then refill. The pressure switch gets stuck. I give the pump a vigorous thumping with my fist and eventually it stops and is fine thereafter.
    Not all who wander are lost

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