Thanks to d8veh and fordulike for always giving supportive comment on ebike issues .Will check phase an hall sensors with my multimeter during next few days. Its an awkward situation though. i have an infuriating need to find out how things work and be able to mend an maintain myself.Spent my whole life asking questions and then cracking on and repairing stuff.But in this case for once ,the product is still in warrentyThat's it. You have to remove the controller to test it. If you're unsure of the results, post them here.
IIRC, there's no way to turn the motor to test the hall sensors, so you have to open it like this, then you can test them. That normally breaks the gasket, so you need a new one or some instant gasket to put it back together.
https://www.electricbike.com/wp-content/uploads/2013/10/BBs01PR.png