Results 1 to 16 of 16
Like Tree6Likes
  • 2 Post By yojabbajabba
  • 2 Post By pcrussell50
  • 1 Post By yojabbajabba
  • 1 Post By Jackster

Thread: Fixing a Breville BES920 steam boiler issues (descale -> 'vALv' error + burnt probe?)

  1. #1
    Member yojabbajabba's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne
    Posts
    59

    Unhappy Fixing a Breville BES920 steam boiler issues (descale -> 'vALv' error + burnt probe?)

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    HI CS family,

    I have picked up this second-hand Breville BES920 (serial 1438-005204-ANZ) in the hopes of giving it some TLC and brewing tasty espressos.
    The only issue machine had was as follows:
    - steam would leak into the drip tray from inside the machine (leak in the steam boiler)

    First thing I thought to do was to do a descale as I didn't know how often the machine had been used... and I got into the trusty 'vALv' error on the second cycle (water flush) of the descale.

    I tried several things that I gleaned from the CS forums, namely:
    - Following the Breville ANZ instructions for descaling the machine
    - Letting the boilers drain overnight
    - Tilting the machine to get extra fluids out...
    all to no avail.

    Further, when I exit the descale cycle the steam boiler isn't firing up / three beep error.

    I had purchased a BES9XX o-ring kit from eBay and decided to go inside and replace the o-rings / inspect the valves. Upon inspection, I found the (attached) probe all gunked up. The black stuff looks like melted plastic, and it was on the clip and on the probe. After cleaning this up and replacing all of the O-rings I've fired up the machine and still getting the three-beep error, and can't get past the 'vALv' error. Further, the steam boiler isn't heating up anymore (I felt the right-hand side of the chassis and it isn't warm at all).

    Brains trust - here are my questions:
    1) Based on the pictures provided, what probe has gone all foul and "black"?
    2) Any other options for getting past the vALv error?
    3) Any suggestions on diagnosing why the steam boiler is not firing up again.


    Thanks in advance!
    Y2J
    Attached Images Attached Images

  2. #2
    Senior Member level3ninja's Avatar
    Join Date
    Nov 2013
    Location
    Sydney
    Posts
    1,050
    In my experience the valv error, the three beeps on start up and the steam boiler not heating can all be solved by closing the steam knob on the right hand side of the machine. If the machine senses the steam valve is open it knows it's a fool's errand to try and heat water past 100C. Don't know about the probe.

  3. #3
    Member yojabbajabba's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne
    Posts
    59
    Quote Originally Posted by level3ninja View Post
    In my experience the valv error, the three beeps on start up and the steam boiler not heating can all be solved by closing the steam knob on the right hand side of the machine. If the machine senses the steam valve is open it knows it's a fool's errand to try and heat water past 100C. Don't know about the probe.
    Hey Ninja,
    Tried the the steam wand open / closed when turning on and nothing happened

  4. #4
    Member yojabbajabba's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne
    Posts
    59
    So, I did some digging and that probe is the NTC probe (5.19)
    BREVILLE Espresso Coffee BES920 ntc wires for steam boiler | BigWarehouse Spares
    Hopefully replacing this does some good, as a new one looks nothing like this dodgy one.

    Can someone tell me what an NTC probe does?

  5. #5
    Member yojabbajabba's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne
    Posts
    59
    Quote Originally Posted by yojabbajabba View Post
    Can someone tell me what an NTC probe does?
    So it turns out that this NTC probe is key for managing the temperature in the boiler, and so if mine is kaput then that might be part of the issue

  6. #6
    Junior Member
    Join Date
    Jul 2014
    Location
    Bathurst NSW
    Posts
    7
    Quote Originally Posted by yojabbajabba View Post
    So it turns out that this NTC probe is key for managing the temperature in the boiler, and so if mine is kaput then that might be part of the issue
    Any progress mate???

  7. #7
    Member yojabbajabba's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne
    Posts
    59
    Quote Originally Posted by bigfella View Post
    Any progress mate???
    Doing the install tomorrow of a replacement NTC and steam boiler fuse. Wish me luck!
    level3ninja and bigfella like this.

  8. #8
    Junior Member
    Join Date
    Jul 2014
    Location
    Bathurst NSW
    Posts
    7
    Any success?

  9. #9
    Member yojabbajabba's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne
    Posts
    59
    I got around to pulling the machine apart this afternoon and had a mild panic attack just looking at how much work it's going to be! I'm going to have to take this slow as getting to the fuse will require uplugging all the probes, and accessing the CPU. Not a two hour task that I thought it was going to be! Will update again when I've had a chance to calm down and think of a logical plan of attack - I'm not giving up!

  10. #10
    Senior Member artman's Avatar
    Join Date
    Jun 2006
    Posts
    2,320
    I did a quick write up doing this a month or so ago. Fairly easy, a couple of tricks which I wrote. It was in the other thread.

    Cheers

  11. #11
    Senior Member
    Join Date
    Aug 2011
    Location
    southern california, usa
    Posts
    303
    I don't descale, ever. Because I use scale free water. But about every month or so, I drain my steam boiler just to reduce the buildup of minerals (of the non-scale kind). Once not so long ago, I did this, and the fill pump just kept running and running and didn't stop. I began to think the boiler wasn't filling. And I was right. I unplugged the machine and open the boiler drain and nothing came out. So I opened the top of the machine and tapped around the vacuum breaker at the top of the steam boiler, closed the boiler drain again, plugged the machine in and this time the boiler filled and all was normal again.

    Not sure how much of this applies to you/OP, but maybe before you tackle this big job, open your steam boiler drain and see if there is water in it. If so then maybe continue with your repair. But if not, then you need to figure out why. And hope that the heater didn't try to come on, and then melt the thermal fuse. You can replace the thermal fuse, but it also requires big disassembly, IMS.

    -Peter
    inorog and Jackster like this.

  12. #12
    Senior Member artman's Avatar
    Join Date
    Jun 2006
    Posts
    2,320
    In my friends machine the steam boiler was empty because the probes were giving a false full reading after the descale.

    Luckily the thermal fuse did its job and blew before the element. Its s bit painful to replace but not really that bad.

    Cheers

  13. #13
    Member yojabbajabba's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne
    Posts
    59
    Quote Originally Posted by pcrussell50 View Post
    Not sure how much of this applies to you/OP, but maybe before you tackle this big job, open your steam boiler drain and see if there is water in it. If so then maybe continue with your repair. But if not, then you need to figure out why. And hope that the heater didn't try to come on, and then melt the thermal fuse. You can replace the thermal fuse, but it also requires big disassembly, IMS.

    -Peter
    Unfortunately I think I'm beyond this step. I let it drain overnight, but the steam boiler got super-hot after I exited the cleaning cycle and the machine "reheated' itself, presumably dry.

  14. #14
    Member yojabbajabba's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne
    Posts
    59
    I'm struggling to find this write-up - could you please direct me to it?
    pcrussell50 likes this.

  15. #15
    Senior Member Jackster's Avatar
    Join Date
    Nov 2017
    Location
    Maddington, Perth. Wa
    Posts
    645
    NTC means negative temperature coefficient. This is a sensor for temperature. It seems they are described by their resistance at 25c. I have a few parts for a sunbeam 6910, it has 100k ohm NTC sensors.
    yojabbajabba likes this.

  16. #16
    Senior Member
    Join Date
    Aug 2011
    Location
    southern california, usa
    Posts
    303
    Quote Originally Posted by yojabbajabba View Post
    I'm struggling to find this write-up - could you please direct me to it?
    Agree. I would like to see this, too. While I have not been victim to needing it, plenty of others have. I would at least like to know where to point them when they need help.

    -Peter



Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •