Baratza.com sells the timer switch for $10 plus $10.58 shipping and handling. I initially called Starbucks and they gave me the old " we don't sell parts but we will sell you a new one".
I just had the same problem. It's the knob itself. You have to extract the knob by pulling, gently, and squeezing it out. The plastic housing over the metal thing is cracked. I took some super glue and duct tape and wound it tightly around it and pushed it back it and it works.
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Popular Solutions for Starbucks Barista Burr Grinder
You can actually just turn it full circle it's very lose and will not set to a specfic number so...
(More)
You can actually just turn it full circle it's very lose and will not set to a specfic number so will not grind
"There is a thermal fuse on the side of the motor to prevent the motor
from burning up. You...
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"There is a thermal fuse on the side of the motor to prevent the motor
from burning up. You can replace the fuse (it is a 103c thermal fuse,
crimp it on ) and you should be in for more grinding. It could also be you timer switch, or bean hopper switch, or a broken tab on your adjustment collar." "a broken tab on adjustment collar would stop motor?"