What do you set the fit bit surge on when walking on the tread mill?

You need a new one. Contact the Electricity utility company and make a claim against them. They are supposed to regulate power and failed in the service you paid them for.

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My tread mill has a bolt on each side at the rear end that I put a hex key in and turn to tighten. Do both sides the same to keep the tread even on the track. Don't over tighten. I have a different make but most operate the same.

Not a small task. You have to remove rollers and deck if you are doing this flip your deck as it is probably due and clean rollers since you have everything apart. Good luck

have the new tread mill checked under warranty as it should not blow breakers from new

yes you can every treadmills made for hourse training can weight for 250 lbs aprox.
Happy new Year.God bless you

Your motor controller is bad. You'd have to replace the controller and walking belt.

hi,
check the speed sensor in ur tread mill. may be it has become dirty. clean it and refix it. u can find out the speed sensor near the motor pulley.
ok

hi,
i think ur tread mills motor controlling circuit have some problem. may be its motor controlling igbt faulty. check it. proper care should be taken will working in tread mill. all the circuits are live . chances for electric shock. do any thing only after removing the power.
ok

hai ,check the walking belt and motor belt tension