Treadmill starts instantly, no belt ramp up

This may be a problem with the LCB.

you must see the schematic diagram coming with your treadmill, or read your owner manual, and follow the instruction in section assembly or parts manual
God bless you

1) Lube the deck belt use 100% silicones or wax, read your instruction manual
2) Lube the rollers bearing use wd-40
3) Replace fuse and see if is o.k now
4) If the problem persist you must test the tension for drive belt motor, and adjust it according.
5) Test the input voltage motor, see my personal TIPS for motor help and troubleshooting.
6) Use the treadmills directing from the source DO NOT USE any extension power cord!
7) Test again if the problem persist,now you have power supply or control board faulty. see the block diagram.attached.
God bless you

i get no power to unit is there a reset or fuse?

Walking Belt is Worn: The only certain way to test for a worn walking belt is to take a DC amp draw (if you have a DC treadmill) or an AC draw (for AC). Trying to look at the belt or a feel test is highly unreliable. Better tests, if you lack a DC ammeter (they are expensive for a good one), are a coast test or an incline test. The coast test is to get on the treadmill as the lowest incline setting and walk on the treadmill at 3 MPH. Pull the safety key and it should take you 2-3 full steps to stop (this is a general rule…some like a few Tunturi models stop on a dime even with a healthy belt but for most models, this tests works well upon). Fewer steps indicate high friction. The incline test is to put the treadmill at max incline and walk on it at 3 MPH. If the treadmill operates normally at max incline but bogs down at minimum incline, replace the walking belt. Gravity takes over for the drive system eliminating much of the friction problem. On some heavily worn walking belts, this test will not eliminate the problem. Go to your local hard ware store and purchase silicone spray. Apply Lubricant by lift one side of the running belt spray contents length wise starting at motor shroud to the back end repeat this process on the other side. If this unit bogs down again then you will have replace the running belt and possibly the deck

this maybe caused by either a lack of lubrication or worn belt I'd try the lubrication first you can purchase it from Iconfitness @ 1-800-999-3756

read in manual on 2nd page in grey area # 3, 4,7 IF THAT IS NOT THE ISSUE, then 2nd question, how old is item, from what you stated, if weight of user not issue and item is fairly new, sounds like mtr dr. belt slipping/loose. can be tightned up like belt on car-under the hood-but if under manufactures warranties, best call them first!!

look for a tension knob it will tighten the belt unless the belt is really wore out and may need replaced

Most likely a bad drive belt. Take the cover off the motor area. If you see black dust near the left side of the motor, replace the drive belt.

start /variable sp. sw. needs replacement.
easy fix for most electric appliance repair person