Breville Dual Boiler, five+ years on - Page 117

Need help with equipment usage or want to share your latest discovery?
gchapman
Supporter ♡

#1161: Post by gchapman »

On careful reading, the money quote here is this sentence:

"Anyone other than a trained and qualified technician diagnosing, disassembling or repairing a Breville® appliance does so at their own risk and releases Breville®, partners, employees, officers and affiliates from any and all liability and damage to product(s), person(s) or property
."

Reflecting more on this, I don't think I gave up my warranty (what little is left of it) or my ability to send it back to them for repairs. They are covering themselves from any liability where someone might open up one of their machines, modify it, and burn their own house down. Looks like they are restricting access to parts to tamp down user modifications and to gain a release of liability as a condition of access to internal parts.

All in all, fair enough.
Geoff Chapman

pcrussell50 (original poster)

#1162: Post by pcrussell50 (original poster) »

Excellent work, pushing back on the boundaries of or community knowledge, there Geoff. Much appreciated.

When you get your new ones, will you do a close inspection of the area around the bottom of the ceramic, where it interfaces with the steel rod? Mebbie we can get to the bottom of the riddle of why/how these things seal at all?

-Peter
LMWDP #553

gchapman
Supporter ♡

#1163: Post by gchapman » replying to pcrussell50 »

Yep, sure will. I'm intrigued! My theory is that the internal pressure of the boiler pushes the flange like base of the probe up into the ceramic sleeve w enough force to seal it. I took off the c-clip washer on the top when I inspected it, enabling me to slide the ceramic sleeve up off its flange base just enough to see that the flange on the rod is stepped, shaped to mate with the bottom of the sleeve. Pressure would be significant. Enough to seal metal against ceramic?

And if the surfaces had some lime deposits, the seal would leak... And then some thick grease might reseal...

I'll post some close up photos when I replace it.
Geoff Chapman

pcrussell50 (original poster)

#1164: Post by pcrussell50 (original poster) »

Or possibly descaling the rod and ceramic might also re-establish the sealing surfaces?

Pics, if you can.

This adds up a little bit as to why it never happened to me since I use water that cannot lime scale due to lack of Ca and Mg.

-Peter
LMWDP #553

BaristaBob

#1165: Post by BaristaBob »

Just to add my two cents to the temp probe issue of steam/water leakage, I experienced this back in the spring of this year. I actually think I caused the leak by leaning heavily on the connector while installing a few o-rings. When I started the BDB back up to check on my repair, water started spritzing out between the probe shaft and the ceramic part. It would start consistently around 175F and stop at around 185-190F. I could push down on the top of it and make it stop, but upon removing my finger it would spritz again. I ordered some food grade silicone grease, as Peter mentioned, placed a dab right where the shaft meets the ceramic housing and it stopped. Still good after six months. Why this works, I have no idea!
Bob "hello darkness my old friend..I've come to drink you once again"

pcrussell50 (original poster)

#1166: Post by pcrussell50 (original poster) »

BaristaBob wrote: I ordered some food grade silicone grease, as Peter mentioned, placed a dab right where the shaft meets the ceramic housing and it stopped. Still good after six months. Why this works, I have no idea!
I say it has to do with the tight clearance between the ceramic and the steel, and the fact that silicone grease doesn't melt at ordinary espresso boiler temperatures.

Though I'm interested in Geoff's discovery that there is a circumferential flat in the rod that might get pressed up into a corresponding flat landing in the ceramic, under pressure. BTW, if so, this would be a similar behavior to how the vacuum breaker works.

-Peter
LMWDP #553

walleye

#1167: Post by walleye »

gchapman wrote:I did get a hold of Breville USA today after waiting on the phone for an hour! In spite of a very bad connection I manage to explain my situation and my request for new steam probes. I fortunately had a part number off ereplacement.com, otherwise he would not have helped me.

In order to sell them to me I had to give up my right to have warranty work done on the machine. After owning it for a year, and with all you guys as my back up, I responded to his email with, "I accept". It sounds like Breville is wary of people messing with the internal parts of the machine and then coming to them for warranty repairs. Makes sense.

I don't know if I gave up at the same time the ability to send it back to them for their $299 and we fix it deal.

The part number is SP0001820, and the cost was only $17 shipped! I would've paid $100 to get them shipped from Australia!
Geoff. Thanks for this. I went through the same thing with Breville and they're sending me the probes (for $17). I'll post some updates as I do the replacement.

Also, one thing that happened... in removing the probe, the grounding screw snapped off. I ended up drilling a new hole in the frame and I plan on pigtailing the grounding wires to the new spot. If anyone out there has had this happen, let me know if you found this easy to fix.

sorenwrang

#1168: Post by sorenwrang »

In relation to my latest question regarding the pressure, I now recorded a video of a clean water backflush.
I am pretty sure that the pressure reached 10 bars or more just a few weeks ago (vs 9-9.5 now) - and I haven't tampered with the OPV. The machine is 2 months old.

Also, I have noticed some slight oscillation in the pressure, as you can see and probably also hear from the video: https://imgur.com/a/MGsPHg7

How do your machines behave during a backflush? Is the pressure 100% stable or does it also oscillate a little? I see no leakage anywhere during the backflush that could explain the oscillation.

pcrussell50 (original poster)

#1169: Post by pcrussell50 (original poster) »

Pressure always oscillates when it is bouncing off of the OPV, as it would with a blind disc or the gray silicone disc. This is normal. The OPV has a plunger on a spring. You can also see if you look very carefully an upwards, a ripple of water on the surface, in the tank. This is the water being bypassed from the OPV back to the water tank.

-Peter
LMWDP #553

sorenwrang

#1170: Post by sorenwrang » replying to pcrussell50 »

Thanks for always being so helpful, Peter!
I will direct my focus towards the level of the pressure itself, making sure that the OPV setting does not limit my brew pressure. I think it is getting close. When I brew 20g in, 40 g out in 30 secs, the pressure is around 9 bars initially.