Jifunull Folding Treadmill- Not Working Properly - Only 2 Years Old

Used most days for about 18 months, last used about 6 months ago, was working fine. Put it away & just decided to start using it again but doesn't work for some reason, turns on okay & lights up. Changed battery in remote. Could be something simple but i have no idea where to start looking. Cost new about £200

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