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Rocket Giotto Premium Plus - Troubleshooting

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  • #31
    Transformer replaced in Controller box gets machine working again

    For those interested, I could recommend visiting a separate thread that I started about my problem at Rocket Giotto Premium Plus won't start - Diagnostic help appreciated - Espresso Machines • Home-Barista.com
    I describes a series of diagnostics and how I ended up replacing the Transformer in my Controller box and explains the effects that this fault caused.
    It also provides a description of the role of the three relays on the controller board and how the earthed water detectors (at water tank and at boiler) are connected to relays which control the completion of the main 240V circuit and the role which the Transformer has in this arrangement.

    All the best and thanks for your interest.
    Graham

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    • #32
      Good thread, lots of useful information there.

      For future reference if you need to do a transformer replacement or if anyone else is reading this, you can use the twin output transformer but it requires some fine soldering work.

      Each set of pins outputs 9Vac at 1VA. By paralleling (not series) the outputs together, the output remains 9Vac but the VA increases to 2VA (combined VA of both sets of outputs.)

      Click image for larger version

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      By soldering the pins together as per the diagram (don't hate on my paint skills) close to the base of the transformer, being careful not to damage the transformer base with the soldering iron tip, this will achieve the coils wired in parallel. Then, cut off the centre 2 pins as close to the base as you can and the transformer should fit into the original mounting spot with enough length on the pins to resolder to the board.

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      • #33
        Well I finally got around to replacing the components last night. Was a pain to get the old components off the board! Put the box back in the machine and.......nothing. Got nothing. No power light. Oh well - it was a good learning experience anyway. I have a feeling it might be something to do with the transformer which was slightly different to the original. (I was told it should work by a friend). Will have to check out noidle22's post above - I think it might be the twin output one. Back to the drawing board........
        Daniel

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        • #34
          I have a Giotto rocket and I am struggling to prime the pump. The machine will not pressurize. I spoke to the technician who sent instructions on removing the water reservoir and pushing water into the boiler using a turkey baster while the handle is in the up position (pump on). This did not work and now I have a blinking green light which i believe is a low water indicator. Any thoughts would be greatly appreciated. My apologies in advance if I am not using this forum correctly. Thank you.

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          • #35
            Hooley dooley. I think it's time your technician looked for a new job. I suspect his sausage stuffer must been out of action that day!

            If you can hear the pump, in all likelihood, there is nothing wrong with your machine. Clean the brass probe and screw in the tank coupling- visible in the base of the machine when you remove the tank. Your machine senses the presence of water by conductivity across these probes and if the water is too pure (distilled or very heavily filtered), the machine will rightly think it has no water.

            If these fail, best to find a real technician, not a turkey roaster!

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