How do I fix the buzzing noise from ceiling fixture?

The sound may be because of either a faulty wire connection or a faulty / incompatible dimmer switch. If all wires are correctly in place and secured, there is a high possibility the problem is with the switch / dimmer switch. KODA recommends the following dimmer switch models; Lutron:  MACL-153MR-WH/ LECL-153PH-WH/ SCL-153PH-WH/ MACL-153MLH-LA/ TGCL-153PH-WH. Leviton: C22-6672-ILW/ R62-06674-P0W. It is also likely our ceiling lights are compatible with other LED dimmer switches not listed here, but we cannot confirm. If the dimmer works, please check if the light is installed correctly according to our installation instructions.