I went down the rabbit hole of replacing the thermal fuse on my Breville Oracle BES980XL steam boiler. The problem started when I descaled for the first time. When I tried draining the steam boiler during the normal descale process, it seemed like nothing would come out. I didn't realize this meant the boiler was empty and burning itself up. After the cycle, the steam boiler would not heat up and my machine temp would not go beyond 150 degrees. I tried to run the water through to do the trick some people have advised to clear an air lock, but no luck. After investigation on many forums, I decided it was likely I blew the thermal fuse on the steam boiler. I inherited the machine for free, so I didn't want to pay the $500 to send it back to Breville. I began tear down.
Disclaimer: I ended up with 5 extra small screws, probably from the base assembly, when I put it all back together. Hope it's not a problem! Maybe you'll catch where I lost them:
Open the top and back panel the way you would to replace its o-rings. Lay the machine gently on the grind side.
Remove bottom parts as follows:




Disclaimer: I ended up with 5 extra small screws, probably from the base assembly, when I put it all back together. Hope it's not a problem! Maybe you'll catch where I lost them:
Open the top and back panel the way you would to replace its o-rings. Lay the machine gently on the grind side.
Remove bottom parts as follows:

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