Error in the communication of IACCC device with the AC unit

I had same error (Code: IH1 Error in the communication of IACCC device with the AC unit.) after recently installing 3 INTESIS units AC Cloud Control to control 3 Fujitsu Halcyon slim ducts we installed >5 years ago which only had wired remotes. I was convinced the 2 units were defective but these 2 units became functional after cutting power to the system with the breaker.