I serviced this Reebok RX8200 Treadmill in Old Orchard Beach, Maine. The treadmill would start and stop immediately

This treadmill suffered some water damage due to the basement that it was stored in being flooded with water. The customer stated that the water level was up to, or over the walk belt.

A preliminary diagnostic showed that the motor control board was bad. The customer also decided to replace the walk belt since it was worn out. We are hoping that the motor control board is the only component that was damaged.

After installing the repaired MCB and the belt the treadmill ran but all the roller bearings squeaked badly. The treadmill struggled to move all of the rusty water damaged components.  We also found that the drive motor began to smoke while running it at high speed.

This was a lesson learned for me.  I may never again recommend that a customer try to repair a treadmill that had been submerged in water, especially if it is a relatively inexpensive treadmill. The cost of replacing the front and rear rollers or roller bearings, possibly the motor or motor bearings, repairing the motor control board, and any other potential damage could be more expensive than the purchase of a new treadmill.

A new motor was too expensive.  I ended up finding a used one on eBay for a reasonable price.

A side note: Never attempt to turn on a treadmill that has been submerged in water.  As a minimum all electrical components and connections should be disconnected and dried out removing any and all moisture as a first step.