York T520i treadmill. Power but belt won't move
I know its old but I have a York 520i treadmill that stopped working during a run a few days ago. The console display comes on and counts down, (relay) clicks but the running mat doesn't move and I get err 1 code. The incline adjustment works and I tried connecting a battery to the DC motor and it turned the running mat OK. I also find if I move the belt with my feet after the countdown ends, the timer will count up normally until I stop moving and then I get the err 1 code again. I'm looking for ideas on what is causing the problem and how I could fix it. Thanks.