Hello everyone, joined this forum for advice and read others issues. I got a Halfords brand Carrera Cross City, had it for around 1 and 1/2 years. The led control (possibly 790 model) seems to have malfunctioned. When I power it on the battery level leds flash and then the assist level LEDs flash and they alternate like this a few times before the control switches off. I checked connectors and they all seem to be in place. I also noticed a slight whirling noise coming from it for the duration it is on. I have charged the battery but still does not make a difference. Grateful if you ebike specialist have advice what could be wrong.