(FIRST TESTING AFTER DOING CONNECTIONS VIDEO) CNC YCQ4-100E/2P Single Phase Din Rail ATS

First testing after doing the connections. I have already tested the SOURCE A and B voltages. They are around ~220V. Solar is source A. Grid Power is Source B. The RED SELECTOR SWITCH is very hard to turn from Source B to Source A, even while on Manual Mode. It is vibrating when I tried to switch to Auto Mode. The color red selector switch is stuck in Source B and did not switch to Source A. It also turned off the Source A light indicator.