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  • Breville Dual Boiler lid/cover overheating

    Hello all! I confess I'm a tourist "visiting" from the UK. Unfortunately on my local forum no-one has been able to help, so thought I'd post here given it's an Australian brand and others may have more experience!

    Quick summary - had some strange noises and brew boiler temperature rocketing. Inspecting inside there was condensation everywhere, caused by a leak from one of the steam boiler probes. I changed a whole bunch of o-rings across the steam and brew boilers, two or three of which were totally worn. Predictably lost one of the spring clips, but have stuck a couple of pins/sewing needles in there that seem to do the job!

    For what it's worth, the machine received a service about 15 months ago (the seller gave me the receipt) - new pump and solenoid.

    In any event, everything seems to be working fine, no leaks, no strange noises. Stable temp, steam fine. BUT, after the machine has been on for 30 or so minutes, the top becomes too hot to touch, so something is clearly still wrong. Does anyone have any ideas/suggestions of what might be causing this?

    Thank you in advance!

  • #2
    The steam likely shorted one of the triacs that are mounted on the underside of the "lid." That or an NTC has gone bad. If you turn it on cold, and then turn it off as soon as it gets to temperature (but leave it on at the wall outlet), does the top still get very hot after a while or does it cool down to room temperature again?

    If it is the triac, best option is to unplug the machine and leave the lid wide open (ideally flipped over resting on something so the triacs are facing up) for at least 48 hours

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    • #3
      Originally posted by level3ninja View Post
      The steam likely shorted one of the triacs that are mounted on the underside of the "lid." That or an NTC has gone bad. If you turn it on cold, and then turn it off as soon as it gets to temperature (but leave it on at the wall outlet), does the top still get very hot after a while or does it cool down to room temperature again?
      Thanks, level3! If I turn the machine off, but leave it switched on at the socket, it does cool down. I've never tried turning it off as soon as the brew boiler hits the pre-set 93 degrees, so I'll try that this evening. But I'm pretty sure that it would cool down rather than continuing to heat up. With my recent tinkering I've never noticed it increase in temperature once I've turned the machine off.

      I've left it lid up for multiple days (TRIAC vertical as you say) before re-using it, and it made no difference.

      Just for completeness - I only use a bottled water recommended here in the UK, and there is absolutely no sign of any deposit build up.

      Lastly - when I opened the machine, i noticed that someone had inexplicably cut the yellow neutral wire, so it was just hanging loose. From a recommendation on the UK forum I stripped the wires back and touch and reconnected them with a mini junction/choc box.

      Comment


      • #4
        Having reread your original description, I have one more thing I want to check, which is the temperature at the three NTCs about 5-10min after it's finished warming up. You do that by following the instructions in this video at around 7min give or take. https://youtu.be/ht_Ny7Lfvns. Report back with those 3x temperatures please.

        But if that's normal, I think is likely there is nothing wrong. The top does get too hot, it's a cup warming tray after all. As long as it doesn't keep getting hotter and hotter it should be fine. Breville did a clever thing by mounting the triac board to a giant aluminium heat sink, they get the heat out of the triacs, and they "warm" cups at the same time. TBH it's a pretty weak effort at a cup warmer unless they're directly over where the triac board sits and left there for quite a while after the machine heats up (the triacs only get hot when switching, so if the machine is cold and the elements need to be on 100% of the time they're not switching)

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        • #5
          Thank you so much! I will run that diagnostic as soon as I get home this evening (10am here and I've had to drag myself to the office....).

          Just re the heat - pre-leak, the top would get never get properly "hot", even after an hour. Definitely warm, but I could still rest my hand on there. Now, let's say after machine has been on for 45 mins (estimate, i might be 40, it might be 60), I can put my palm on there for just a few seconds but it would then burn me if I kept it there longer. And that can't be right!

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          • #6
            Ok, so I ran the diagnostics. Incidentally, I turned the machine off as soon as it got to 93 degrees for the brew boiler. And it felt like the top was a little warmer after a few minutes.

            But the 3 temperature readings were 95, 129 and 80. For reference, I have the brew temperature set at 93 and the steam boiler at 130 (I lowered it from the default 135 when I was trying to figure out what was wrong). So I guess those numbers looks ok? Which doesn't get me any closer to understanding the issue here I guess!

            For what it's worth, the shot count say 903 which I understand is 9030 which is probably fairly high....

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            • #7
              The 80 is a bit low. Try leaving it until the top is too hot to touch then do it again.

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              • Blues1143
                Blues1143 commented
                Editing a comment
                Agree - I checked mine recently because I thought it was cool and it stabilized around 90 degrees with brew temp set at 92 or 93.

            • #8
              Understood, I will have a go again this evening when I'm back from work.

              A big thank you again for taking the time and patience to assist with me with this, it's massively appreciated.

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              • #9
                So I can confirm that having kept the machine on for a good 45 mins or so, the temperatures were 95, 127 and 90 respectively. Based on your comments, I guess that's pretty much exactly where they should be. I guess I can live with the top running a little hot, it's not the end of the world.

                Probably not relevant, but at some point when the machine had been on for 30 or 40 minutes, I heard the pump go into action briefly (I don't know if "priming" would be the technical term here). Just 2 or 3 seconds, and that was it.

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                • #10
                  Ok all sounds pretty normal. Hard to say 100% that nothing is wrong, but sounds like nothing major at least.

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                  • #11
                    Well that's pretty reassuring, good stuff. Guess I'll just keep an eye on it and if things get worse again at some point I can look into it. But for now, good enough I guess.

                    Thanks again for all your help, very kind!

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