My walking belt is slipping and i tightened the screws in the back but that didnt help. Any ideas?

Your walking belt can seem to slip for up to 4 different reasons.
1) You may have an electrical problem.
2) You may have a loose walking belt.
3)You may have problems with the drive pulley system.
4) Your drive belt may be faulty.

Unless you're familiar with how to check these areas, it may be best to get a service technician.

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