Arrived to replace outdoor PCB board on ductless mini split. Indoor head in the 3 season room has been faulting out on a code E1 sporadically for the past year but now won’t even run. Recently replaced the indoor PCB board and it didn’t fix the issue. According to Carriers service manual the outdoor PCB was the next step. Called Carrier tech support and explained issue. Found out the issue is with the wire between the indoor and outdoor unit. According to Carrier it’s supposed to be stranded wire instead of solid wire. Both heads have solid wire ran to them from the outdoor unit. Carrier has found that after a year or so of use with solid wire the indoor heads will start faulting a code E1 randomly. Install manager is informed about job and will be reaching out to the customer with a game plan and cost for replacing the wire to both indoor heads.
