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Thread: Pump diagnosis?

  1. #1

    Pump diagnosis?

    Hi All, Bit of a stranger here but I'm trying to get on top of a pond I inherited 3 years ago. I've been cleaning it for months, getting all the much from the bottom and will be finally getting a decent filter system installed very soon. Right on queue the pump decides to play games with me. It's an Oase Aquamax Eco 16000, about 4 years old and always worked fine, It stopped yesterday for no reason, I pulled it apart and cleaned it up (although I cleaned it and the satellite housing a few weeks ago) and put it back in the water and it ran but when I stopped and connected the satellite it wouldn't start.
    I've cleaned out all the pipes and tested they are unobstructed so It's not that. I eventually disconnected it fully, pulled out the impeller and cleaned it fully. If I try to run it dry for a second or two (which I assume I shouldn't be doing) it seems to try to run fast and then very slowly then is randomly trying to start up, as if it has a bad electrical connection internally.
    I put it back in the water and it ran, connected the outlet and it pumped, connected the satellite and it wouldn't start. Disconnected, check the impeller turned by hand, put back in the water and it starts, connected the outlet and it pumped so I left it alone overnight. Got up this morning and it's stopped and won't restart.
    The impeller feels like it turns freely and looks OK to me, I can't see anything wrong with the impeller mechanism at all and the rest of the pump appear to be sealed.
    Any suggestions on what I can do or if it's likely to be faulty internally? As I'm looking at around 500 to replace it I'd like to be sure if it is faulty!
    I am near a World of Water so I can drop it into them but not sure if they have facilities to do anything with it.

    Thanks

    Mark



  2. #2
    Extreme Koi Member Rank = Nanasai NickK-UK's Avatar
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    I assume it's an impeller based pump - check that there's no damage or a ceramic centre pin hasn't broken or worn.
    1700 litres on 50 watts
    Planned 11,777 litres on 58 watts. 1300l anoxic, 4" airlifts, Solum 16, bio.

  3. #3
    Quote Originally Posted by NickK-UK View Post
    I assume it's an impeller based pump - check that there's no damage or a ceramic centre pin hasn't broken or worn.
    Yes, correct. It appears fine but maybe someone more experienced than me would see the difference between a new one and this one.
    As my pump isn't running am I putting my fish at risk? I have a air pump that is oxygenating the water but obviously I don't want to run like this for too long.

  4. #4
    Extreme Koi Member Rank = Nanasai NickK-UK's Avatar
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    Quote Originally Posted by Mags View Post
    Yes, correct. It appears fine but maybe someone more experienced than me would see the difference between a new one and this one.
    As my pump isn't running am I putting my fish at risk? I have a air pump that is oxygenating the water but obviously I don't want to run like this for too long.
    You want a pump - the bacteria in the filter providing biological processing needs oxygen which comes from the water flow.

    It's good you have an air pump due to the hot weather.
    1700 litres on 50 watts
    Planned 11,777 litres on 58 watts. 1300l anoxic, 4" airlifts, Solum 16, bio.

  5. #5
    I had a meeting cancelled so I quickly disconnected the pump and raced to World of Water (Crawley) They were really helpful, put a plug on the end and saw the problem, sometimes it runs, and other times it doesn't start, if you turn the impeller manually (with the power off) it then will typically start. 3 different members of staff inspected it and pointed out a fair amount of scoring on the magnetised side of the impeller and corresponding scoring in the pump. Annoyingly if the pump had been registered when bought by the previous owner it would still be within it's 5 year warranty (3 by default + 2 if registered) but given the cost of a new impeller (~80/90) and the scoring in the pump I have bought a new one just in case a new impeller runs for another year and it gives up again or whatever. I have an RDF on order so a new pump will complement this. The credit card has taken a beating this month but I'm looking forward to getting the RDF installed and getting the pond into the state it deserves.
    Thanks for the quick replies.

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  7. #6
    Senior Member Rank = Hassai hippo's Avatar
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    If you have no joy with your pump , it might be worth shopping around for a new one . A lot of the newer pumps are a lot more economical than older ones and don't have to cost the earth .

    I recently bought a Jabeo 20000 variable for 170 and it uses less than half the power of my old "eco" pump , for the same output
    Colin

    2500 Gallon Fibreglass Pond
    Eazypod , Bio-Max 4 Bead , 18 Basket Anoxic

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  9. #7
    That is significantly cheaper! I've had to fork out for a new Oase pump now but good to know for the future, thanks.

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