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

  1. #1
    Member yojabbajabba's Avatar
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    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
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  2. #2
    Senior Member level3ninja's Avatar
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    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
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    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
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    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
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    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



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