There could be a few reasons your Belkin wireless charger isn't working. It could be that your charger fails to connect to a power outlet, or your phone isn't in the correct position and needs adjusting.
You can also try to remove your phone case. Although Belkin wireless chargers have been designed to work with most cases, some may have metal in them for durability, which may prevent charging. Magnetised phone holders may also affect the way the wireless chargers work.
Another common issue with wireless charging is the phone's misalignment on the charging pad or stand. Try moving the phone on the pad or stand to align it correctly.