Insteon KeypadLink Dimmer 6-Button

ERROR o.o.b.i.InsteonPLMActiveBinding[:502]- item Great_Room_Fan references unknown feature: dimmer, item disabled!

Items:
Dimmer Great_Room_Fan "Great Room Fan" <fan> (Great_Room, Fan) {insteonplm="28.A5.DD:F00.00.15#dimmer"}

Keypads use the feature loaddimmer instead dimmer. See https://github.com/openhab/openhab/wiki/Insteon-PLM-Binding#keypad-dimmers. It should be:

Dimmer Great_Room_Fan “Great Room Fan” (Great_Room, Fan) {insteonplm=“28.A5.DD:F00.00.15#loaddimmer”}