Hello All, Today my wife expressed her wish to have a cappuccino, which I gladly started preparing. I use my V 99% of the time to make double ristretto shots, and a few times a year I would switch the steam boiler on to froth some milk. I have had the machine since February 2020 and it has been seamless by far. Today after the boiler heated up to 127 deg I decided to renew the water inside. I poured out around a litre of hot water, the pump kicked in and refilled it. When it started re-heating all of a sudden the display showed 2.7 bar and the red Alarm sign popped up (as shown in the picture) and I managed to switch off the boiler from the touch screen. Just before the screen went all red I heard some steam leaving the boiler, as I suspect, from the relieve valve. I waited ten minutes and switched on the steam boiler again. Again, the temperature was raising steadily to 121 deg C when once again the display turned red and I had to switch it off. My thoughts are (I have not yet opened the machine as it is still very hot) that the thermal probe (PID?) has gone wrong and it did not switch off the heating element letting the temperature to raise above the limit and cause the relieve valve to open. I do remember that quite a few users had to replace their thermal probes so I believe my boiler suffered similar fate. I will very much appreciate your thoughts. I hope that @DavecUK could advise me on the best way of action. For the time being I will continue using the machine in brew mode, as I have been doing for almost three years now. I, however, would like to resolve the issue in due time. Thank you in advance for your wisdom . Cheers, John

Will be the steam boiler sensor. I had to replace one in my evo, luckily really easy to do with PTFE tape

Cuprajake Thanks Jake, are these standard or do I have to go back to Paolo and get it from Naples?

Not sure, I think there ¼″ but would have to check

John_Yossarian They are standard, if you can get the stainless steel one, they are potted differently and last a lot longer. I guess you could ask the factory, but the postage cost iis likely to be high unless they can fit it in a sort of letter. Also check the probes by swapping the connectors over….. from the brew boiler one, leave the brew boiler one unconnected, or connect it and to not get an error disconnect the heater. The connectors are about 15cm down the probe wires and can simple be pulled apart and swapped over in a few seconds…then you will know for sure if it’s the probe. If you start up the steam boiler and it all works normally…then your sure. If you do decide to order a steel one from the factory and the price is reasonable…buy 2!!! In fact I think it will be cheaper getting it snail post from ACS (they can mark it no value warranty spare. This is because prices are a very expensive in the UK, the brass ones are £30 and this is well https://espresso-solutions.co.uk/temperature-probe-expobar/

DavecUK "#p37799 Hi Dave, Thank you very much! I will try to check as suggested and should it be the culprit wil go back to Paolo and ask for two steel probes as advised. I will update with my findings.

Something went wrong whence the double posting. I cannot delete it myself.

Cuprajake Did you source it locally or (being under warranty) did Paolo send you a spare? As @DavecUK advised I will most likely go back to Paolo and pay for two just in case, subject of proving the hypothesis (very likely) this is the culprit. Looking at the prices in the UK they are insane.

[unknown] Something went wrong whence the double posting. I cannot delete it myself. I have deleted it for you

John_Yossarian Something went wrong whence the double posting. I cannot delete it myself. I deleted it for you.

DavecUK Hi Dave, I was trying to find the video on the Vesuvius, but it is not on your You Tube channel. I have seen some reviews of Chris Coffee and Whole Lotta Latte but I cannot find yours. Can you please, post the link? Thanks! PS I found a steel Expobar thermal probe for £43 delivered. Is this a good price to consider?

ACS Vesuvius steam boiler overheats and relieve valve opens

John_Yossarian

DavecUK Thank you for explaining it. It makes perfect sense, moreover the temperature jumps in the steaming boiler are significantly bigger than for the brewing one.

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