I have a Bunn grinder.I changed the burs a few months ago and it has recently been rewired. Here's the problem, when I go to grind coffee I have to turn the dial for it to engage and start grinding.

the wiring diagram should be inside the grinder pannel.

if not then take modal number and call BUNN
or go to BUNN website

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you should not do this

the knob keeps two burrs together .The knob forces the screw (when you turn for grinding quality).
and adjust burrs far and close as needed
.reinstall it and turn the knob to the right until you feel tightness.Then,turn to the left 3 turns. and then adjust the grinding quality whatever you like .
thanks
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You will have to dismantle the grinder, removing the 2 bolts at front, then working your way back to the grind chamber, You can find the diagrams for the machine on bunn.com

I do apologize but there isn't a wiring diagram available for the machines. If you will call customer service at 800-352-2866 we will be happy to assist you with your issue.

It sounds as though your grind is out of adjustment. The grinder is probably set too fine. I have not worked on a G3 grinder but I would think it is like the Bunn G2. On the front knob you will find 2 small set screws and one larger adjustment screw (in the middle of the knob)
1. Set the selector knob to finest setting (Espresso or Turkish)
2. Loosen the 2 set screws about 2 turns.
3. Activate the start switch (you must activate the "bag switch" behind the chute)
4. With the grinder running, SLOWLY turn the center screw clockwise only until you hear a very slight whirring sound (this is the burrs touching).
5. Then, back off the center screw counter-clockwise about 1/8 of a turn, shut off grinder and re-tighten the set screws.
Check the grind in the "drip" setting by running a few beans through... the grounds should be about the consistency of sand. You should get a better flow through the machine with the grind adjusted properly. You may want to check the cleanliness of the hopper in the top... I have seen these dirty enough to impede the falling of the beans to the grinder.
Also, whenever you remove (for cleaning) the 2 larger screws that hold on the front "plate", be sure to put them back in evenly... kind of like one would with a wheel on a car- Finger-tight then slightly tighten each on a little at a time (back and forth) until tight.
Hope this helps.

sharpen it blade dull

First turn grinder to coarse setting and try grinding some white rice through it, that will clean out the coffee oils, if that does not work then the you will have to open the grinder and clean out the burr chamber and the spout for the grounds.

Have you replaced your blades recently? If you will call contact customer service, we can send these out to you free of charge.

You will need a manual that has all the instructions for your machine, as this is too long a subject to answer here. The manual for your machine can be found at: http://www.bunn.com/pages/techdocs/manuals/grind.html

After taking the top burr off several times and rescrewing it, I finally was able to exert enough force to get it to turn a couple of extra turns. Evidently there was some oil or coffee gunk (although I could see none) that snagged the bur. Now it appears to work as before.

This is a great, service by the way. Even the process of thinking through the problem so I could post it helped me solve it.