gain

Hi all, Any help would be appreciated - I have had a Gain F20 for 6 weeks and done around 400km. All of a sudden last week I am no longer able to increase the assistance from level 1 Green. Any ideas? I am restricted to a 125wt output. Thanks in advance.

https://www.myelectricbike.co.uk/electric-bikes/style-en/crossbar/orbea-gain-m10/