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Thread: Pool Solar Controller not working what part is this

  1. #21
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    Quote Originally Posted by h8fg4 View Post
    Not that I know of, its been screwed to the wall for 18 years and only took it off the other day when it stopped working, took the front off and found the transistor like it is


    Just check that sensor wiring and the power for the pump are kept physically far enough apart. Maybe rodents chewed through the insulation.
    Other than that I can only imagine a secondary (very minor) lightning strike on the roof somehow finding it's path through the sensor wiring
    Last edited by nomeat; 03-11-18 at 12:01 PM.
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    it appears to me that the pool and roof are commoned on one side ? ps some thanks for those wouldnt go astray ! cheers don
    edit: just had a looky at the b/d on the right there are same two circuits that go to the sensors . as a result the transistor is balanced between on and off thru bias of q2 and held in place by the other transistor , so the difference between the roof sensor or the pool sensor is commoned back to q2 and set by the pot so as to operate the relay thru collector of q2.
    Last edited by hinekadon; 03-11-18 at 05:59 PM. Reason: more
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    Quote Originally Posted by nomeat View Post

    Somebody accidently connecting 240V seems way more likely.
    Mains across any semiconductor device that's not rated for it tends to produce an immediate explosion, usually resulting in blowing
    the device to bits, often only leaving the remains of the legs behind or part of the body.
    This thing has had a slow burn, in other words it's got really, really hot - so much so the plastic has slow melted.
    It's not something I had seen much at all in my 45 years of electronickery.

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    Quote Originally Posted by Studio1 View Post
    Mains across any semiconductor device that's not rated for it tends to produce an immediate explosion, usually resulting in blowing
    the device to bits, often only leaving the remains of the legs behind or part of the body.
    This thing has had a slow burn, in other words it's got really, really hot - so much so the plastic has slow melted.
    It's not something I had seen much at all in my 45 years of electronickery.
    This does not have have to be a direct connection to active.
    I mentioned above rodents !

    I have even seen slugs INSIDE a powerpoint. It tripped the RCD so I had to pull it apart.
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  • #25
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    Well so far so good, as I mentioned earlier there was a possible short in the roof sensor so I carefully cut into the brass end and separated the wires and it tested ok.
    I then replaced the transistor ( everything else looked ok)
    Its now running normally, started the pump as it should, just need a hot day to test it further. Its only been running for about an hour so fingers crossed !!

    Thanks again everyone for you're help.

    cheerrs thomo
    Last edited by h8fg4; 08-11-18 at 12:20 PM.

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    you can test it by holding a cig lighter on the other probe and see if it changes over, for a short time
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    Quote Originally Posted by hinekadon View Post
    you can test it by holding a cig lighter on the other probe and see if it changes over, for a short time
    Yea thanks all seems good the roof sensor is changing with the outside temperature, but its too cold to have the solar pump working to test if it turns on and off correctly.



    thanks

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