Question about Breville BES820 Espresso Machine

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Breville BES820 Espresso Machine internal short circuit

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  • Spotless Overalls
    Spotless Overalls Apr 09, 2011

    Ok, I'll describe my own fix to my own problem in the hope that it helps others. First of all, the symptoms: your machine just stops working altogether; all lights go out; you try and turn it back on but nothing happens; then you realize half of your house has lost power. So you try and reset the circuit breaker, but you can't succeed until you turn off the machine at the wall plug.

    The diagnosis: probably an internal short circuit.

    This is what happened to my machine, and because it's out of warranty I thought I'd have a quick look at it myself. Turned out to be simple fix, so here goes...

    Getting access to the wiring we need to look at is easy enough.

    1. Disconnect power from outlet (obviously);
    2. Use your Torx T20 to driver bit to remove 4 screws holding the rear cover, then turn the machine upside down and remove 2 small philips-head screws securing the base of the rear cover. remove the cover.
    3. Gently bang the top die-cast cover from the back to try and dislodge it and move it towards the front of the machine (there are no screws holding the cover on the BES820, it is just a tight fit under some lugs). Your attempts to move the cover will be met with resistance. In the end I needed to thump it quite hard with my hand. A rubber mallet would probably be ideal, but I don't have one. Once you have pushed the cover forward by about 10mm, you should be able to lift the cover off.
    4. Unscrew the earthing cable form the top cover and put the cover aside.
    5. Now inspect the visible cables. Look in particular for any pair of wires that may be making contact with each other. This was what I found in my case. Two wires had been rubbing against each other, probably due to the vibration cause by the pump, and eventually had rubbed through the insulation to the point where the circuit was shorted. Smoking gun found!
    6. If you find this evidence, you will need to a) add some additional insulation where the original has worn through (make sure it is heat and steam resistant, consult with your electronics store), and b) ideally, try to rearrange the cabling to keep some physical separation between the cables so it doesn't happen again.

    When you are satisfied with your work, you can test it by plugging it back in and turning on at the wall. If you haven't replaced the covers yet, be aware that most of the visible wiring you see in there is running mains voltage, so keep hands clear!

    Reassembly is the reverse of above. Don't forget to re-connect the earth lead to the top cover before replacing it. Good luck!

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  • steve_s741
  • 4 minutes ago
Ok, I'll describe my own fix to my own problem in the hope that it helps others. First of all, the symptoms: your machine just stops working altogether; all lights go out; you try and turn it back on but nothing happens; then you realize half of your house has lost power. So you try and reset the circuit breaker, but you can't succeed until you turn off the machine at the wall plug.

The diagnosis: probably an internal short circuit.

This is what happened to my machine, and because it's out of warranty I thought I'd have a quick look at it myself. Turned out to be simple fix, so here goes...

Getting access to the wiring we need to look at is easy enough.

1. Disconnect power from outlet (obviously);
2. Use your Torx T20 to driver bit to remove 4 screws holding the rear cover, then turn the machine upside down and remove 2 small philips-head screws securing the base of the rear cover. remove the cover.
3. Gently bang the top die-cast cover from the back to try and dislodge it and move it towards the front of the machine (there are no screws holding the cover on the BES820, it is just a tight fit under some lugs). Your attempts to move the cover will be met with resistance. In the end I needed to thump it quite hard with my hand. A rubber mallet would probably be ideal, but I don't have one. Once you have pushed the cover forward by about 10mm, you should be able to lift the cover off.
4. Unscrew the earthing cable form the top cover and put the cover aside.
5. Now inspect the visible cables. Look in particular for any pair of wires that may be making contact with each other. This was what I found in my case. Two wires had been rubbing against each other, probably due to the vibration cause by the pump, and eventually had rubbed through the insulation to the point where the circuit was shorted. Smoking gun found!
6. If you find this evidence, you will need to a) add some additional insulation where the original has worn through (make sure it is heat and steam resistant, consult with your electronics store), and b) ideally, try to rearrange the cabling to keep some physical separation between the cables so it doesn't happen again.

When you are satisfied with your work, you can test it by plugging it back in and turning on at the wall. If you haven't replaced the covers yet, be aware that most of the visible wiring you see in there is running mains voltage, so keep hands clear!

Reassembly is the reverse of above. Don't forget to re-connect the earth lead to the top cover before replacing it. Good luck!

Posted on Apr 09, 2011

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