BREVILLE BES 920 COFFEE BOILER FAILURE – FUSE BLOWN. YOU REPLACED IT, BUT THE MACHINE STILL WONT REACH RUNNING TEMP 93 DEGREES

What the hell is this guy on about? – just wait before you dismiss this rant, does the following sound like you and your machine issue.

Ok you noticed the machine seemed to be getting too hot, then one day it stopped getting hot at all. You got brave enough to open the lid and you noted the coffee boiler was stone cold.

Ok you thought, check the fuse. Sure enough the fuse was blown. So you replaced the fuse, but you remembered again! what the old Russian Coffee Tech Vidali said all those years ago. “A thermal fuse does its job by blowing, Nyet is it just a fuse at fault”.
Ok you thought it must be the triac board. You noted the amp draw was 0.9A, (as it should be) when the machine was off but you were feeling lazy and decided to stuff this job up and assumed the triac board must be at fault. So you ordered one from Outwest Coffee and fitted it and a new thermal fuse for the coffee boiler. And to your horror, the same thing happened.

Which = The machine temp on the display hung at 65 to 70 degrees and very strangely, the coffee boiler was getting way too hot. So to avoid damaging the new thermal fuse you turned it off. You now realized the machine is mental, its not the triac board. Its showing a low temp on the display 65 degrees, yet cooking the shit out of the coffee boiler.

So you look on the real time log (big secret how to see this) it tells you the coffee boiler is way over temp. So this tells you the machine knows its cooking the coffee boiler, but the bloody display temp says 65’C. Its almost suicidal, hiding its bad intentions, now you are scratching your head. It cant be the coffee NTC? as its telling me its overheating, maybe the new triac board is faulty, that bloody Outwest Coffee Mob? You just cant let go of that Triac board can you?
You check the water level in the coffee boiler, its full??? – what is this shit

Has this machine lost its mind?, have you? – are you in cognitive decline, just like Joe Biden? Are you crap at this like the wife says?, should you have paid someone to do this?, there is more than a coffee machine at stake here isn’t there? Stop panicking there is a logical explanation to everything except for ghosts and UFO’s. It’s time to think outside of the square.

Ok there is stuff you dont know man!, important stuff! – firstly on the newer BES 920s the displayed temp is a function of the Block NTC and the Coffee NTC (an average of the 2) so we know the coffee NTC is probably ok the processor knows it is going over temp. But could the block be going over temp and heating the coffee boiler. Yeah but then why is the block over temp not registering in the Error Logs.

Suddenly the penny drops. If the block NTC has failed it would not register an over temp alarm, nor would it return a normal value to the display temp calculation. And yes the Breville did not think of that. so that temp on the display is probably the function of 5 degrees (faulty block sensor reading), + 105 degrees (real coffee boiler temp reading)/2.

So here is what is going on,

  1. The block NTC has failed (not open circuit), just sending a low value to the processor.
  2. The processor is heating the shit out of the block element trying to get it to the set temp, which is over heating the water in the coffee boiler. which sits on top of the block.

    Sure enough replacing the block NTC solved the issue. The only remaining mystery apart from ghosts and UFo’s is why did the thermal fuse on the block not blow. Why did the coffee boiler thermal fuse blow first. The answer is, just to screw with you. Its the work of Demons! And the placement of the fuse means it never seems to get that hot. Some Breville software Engineer, who doesn’t even drink coffee was late for lunch and didn’t add a what if in there.

If I lost you somewhere in this story, don’t worry. Buy a Triac board from me anyway. They fail sooner or later. But it it fails to resolve the issue, check your NTC’s. Might be a good idea to replace them all anyway. The coffee NTC and the Breville block NTC. Just buy more stuff from me and it will all work out ok.

3 Responses to “BREVILLE BES 920 COFFEE BOILER FAILURE – FUSE BLOWN. YOU REPLACED IT, BUT THE MACHINE STILL WONT REACH RUNNING TEMP 93 DEGREES

  • Hi, I used one of your posts from December 2018, “How To Enter Self Check Mode” on Bes900 & 920. I did follow the instruction but after checking the boiler temperatures, the display started alternating message ErAS/EPP and I pressed menu because I thought that was the way to exit. However, the machine reset to the factory defaults. I was wondering what did I do exactly, whether I maybe reset some hidden settings as well. Sorry for bothering you and thank you in advance. Stefan

    • Hi Stefan, I am new to the 900 series, but I believe that message is shorthand for “Erase EEPROM?” Which would clear all settings stored on the EEPROM. I am also trying to figure out how to navigate that menu, I have heard it called the service or engineers menu. Additionally, when you first access it, I think it will display your machines firmware revision usually a letter and a 2 digit number. I am on the hunt for how to reset the 00:00 fault codes, and for any info on the service or engineering menu.

    • Hi Stefan, I believe that message is shorthand for “Erase EEPROM?” Which would remove everything written to the EEPROM and probably bring you back to factory settings. I recently found out about the 00:00 – 12:00 failure codes and am looking for how to reset them on the 900. Also looking for any info on the service menu where ErAS EEP and the temperatures and I think the FW revision is stored and displayed? If anyone has any of this info, please let me know.

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