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Thread: Expobar minore cutting in and out HELP !!

  1. #1
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    Expobar minore cutting in and out HELP !!

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all, when I turn my machine on in the morning the priming noise cuts in and out about 20 to 30 times and then heats up as normal.
    After that initial startup she runs perfect. Could this be a problem with the opv valve ?
    I adjusted the opv screw a touch and it seemed to stop but only for a week or so and now the problem is back.
    Any advice would be great.
    Thanks Ross

  2. #2
    Mal Dimal's Avatar
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    G'day Ross...

    More likely mate, that it is related to the Steam Boiler Water Level Control...
    In the first instance, check the cleanliness of the Water Level Sensing Probe. It may have sufficient buildup of scale on it to cause erratic operation of the related circuitry....
    Just give the probe a clean up with a plastic pot scourer or similar and replace. You must make sure that you install it back to the same height position that it was in originally. If this turns out to be the problem, perhaps you should examine more efficient water filtering options. Any of our Site Sponsors should be able to assist in that regard.

    Mal.
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    Quote Originally Posted by Dimal View Post
    G'day Ross...

    More likely mate, that it is related to the Steam Boiler Water Level Control...
    In the first instance, check the cleanliness of the Water Level Sensing Probe. It may have sufficient buildup of scale on it to cause erratic operation of the related circuitry....
    Just give the probe a clean up with a plastic pot scourer or similar and replace. You must make sure that you install it back to the same height position that it was in originally. If this turns out to be the problem, perhaps you should examine more efficient water filtering options. Any of our Site Sponsors should be able to assist in that regard.

    Mal.
    Thanks for that, I just took it out and gave it a good clean. It did have a some scale on it but not too bad.

    The machine is 2 years old and I use purified water
    See how it goes once it's dead cold.

    Thanks Ross
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  4. #4
    Mal Dimal's Avatar
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    Doesn't need much scale as it's a fairly good insulator...
    When you say that you use purified water, what sort of setup do you have installed?

    Mal.
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    Quote Originally Posted by Dimal View Post
    Doesn't need much scale as it's a fairly good insulator...
    When you say that you use purified water, what sort of setup do you have installed?

    Mal.

    Still no good, done the same thing this morning then the pump noise stopped and it was just flicking on and off with no sound.... im lost

    Can you upload video on this site ?

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    TC
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    Hello Ross,

    Try a couple of tanks of regular tap water and see if it makes a difference. If yes, your filter is not leaving sufficient ionic content in the water.

    If no, it may be an issue with the pump or with the autofill circuit- possibly at the control board.

    Chris
    Last edited by TC; 7th December 2016 at 09:10 AM. Reason: typo
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    I've got a 4 stage cartridge filter system. Might have to bring it in to the shop unfortunately

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    TC
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    Quote Originally Posted by morelz View Post
    I've got a 4 stage cartridge filter system.
    ....and that is most likely the cause of the problem. Referring you back to my earlier advice, I'd strongly suggest you try a couple of batches of unfiltered water.

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    Quote Originally Posted by Talk_Coffee View Post
    ....and that is most likely the cause of the problem. Referring you back to my earlier advice, I'd strongly suggest you try a couple of batches of unfiltered water.
    OK I'll refill with tap water and try that, at the moment though the pump isn't turning on though . The red light is just flicking on and off in 1 sec increments as it was before but with no pump noise. PID is staying on so it's not the whole machine cutting out.
    It sounds like a solenoid flicking on and off.
    I'll try and find a problem with my multimeter today
    Thanks
    Last edited by morelz; 7th December 2016 at 10:41 AM.

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    OK, so I'm pretty sure my problem is the control board.
    I disconnected the pump wire to the control board and it's working fine when I pull the leaver so pump is good.
    When the machine is flicking on and off continuously the pressure stat is bouncing from zero Volts to 40 Volts (up and down) am I right to say that the problem is from the board ?
    What's the best way to check the control board with my multimeter ?

    Thanks Ross

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    Sorry, also on the static relay the green light is on solid and im getting 230v on the input and zero Volts on the output side.....

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    Ended up being the board.. replaced it and we're all sorted.
    Would like to refurbish the old one if I could, is there a way to find/test the root of the problem ?
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  13. #13
    Mal Dimal's Avatar
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    Behmor Brazen - $249 - Free Freight
    Well, that PS capacitor is looking a bit dodgy for a start...
    Start out checking the status of the main power supply components to ensure that you actually have the appropriate voltage where it is required and then go from there. I've read here that the PS Transformer often goes Open Circuit so perhaps that's something to be aware of...

    Mal.



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