Dear
I had a BH fitness G6435 treadmill, its problem is the transistor (20N60) on the power supply board trips, I replaced this transistor 2 times and I had the same problem. Please note that the second time I replaced the transistor and tested the belt (no user on the belt) it worked for over 2 hours with no problem, then I decided to get on the belt with a speed of 2 km/h after almost 10min the belt stops and the display gives me the error E1, after restarting, the motor runs for less than a second and stops with 'the error E1on the display

 

Hi there! I have the exact same problem. Did you managed to find a solution? If so please be kind and share! Much appreciated.