For those facing LED notification issues, there is a possibility that the LED is NOT a multi-coloured one as per higher end phones. It could possibly be only red, orange and green. Hence, when you set it to other colours, it either doesn't show up, or in another colour.

I used Light Manager - LED Set to customise the LED notifications. Works fine on my Asus Zenfone 5 to test all the available colours, which turns out, on the Asus ZF5, only shows red/orange/green. Not much customisation can be done. I think the Huawei Honor 3C should be similiar as they are of the similar budget range.