Edit, 1hr later: yes, I can confirm that the part in my post above was the culprit. It had “bricked” my Barista and is indeed a thermal cutoff fuse. I nabbed a similar fuse from another Saeco espresso machine, this one labeled as a 152ºC cutoff fuse, but a different brand, “Microtemp”. A search of the internets has revealed that this is the “Kleenex” or “Xerox” of thermal cutoff fuses; Microtemp may have been the main manufacturer of these in days past.
The 152ºC Microtemp fuse tested closed, the defective older fuse open. Since the leads, connectors and length were nearly identical I easily installed it in the same place, and everything works.
So if you have a Saeco/ Starbucks machine that’s failing to power up— Step 2, Pic 2, above: see where the hot (black) leg of the AC line cord enters the terminal block? The brown wire on the other side of the terminal block is clamped to the top of the boiler underneath that heat shrink.
That’s the main thermal fuse. Replace. About 150ºC. Must be rated 240V, 15A.
Actually, I’ve found one more thermal cutoff beside the fusible-link found on the pump. If you look closely at the top of the boiler, you’ll see a wire, fastened down tightly with heat shrink around it. In your pictures it’s silver-colored and is held down by clamps on top of the boiler. It looks to be wrapped with aluminum and then clear heat shrink. It comes directly from the “hot” side of the 120v line (in North American machines). On my particular machine the heat shrink looks different, and underneath the heat shrink it’s a Fuji thermal fuse, stamped “S143”. It’s rated at 240 Volts, 15 Amperes, 147ºC. My machine is simply dead, with nothing at all happening when plugged in and turned on, so I was searching for the culprit and this fuse tests open on my machine.
Just thought I’d mention this, in case anyone has had the same problem, though I’d imagine it’s fairly rare for this to fail.
The only place I’ve found an exact replacement is here:
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