6015.4.2 H12 (Indoor/Outdoor Capacity Rank Mismatched)Malfunction Decision Conditions• During startup, error code appears when different types of indoor and outdoor units are interconnected.Malfunction Caused• Wrong models interconnected.• Wrong indoor unit or outdoor unit PCBs mounted.• Indoor unit or outdoor unit PCBs defective.• Indoor-outdoor unit signal transmission error due to wrong wiring.• Indoor-outdoor unit signal transmission error due to breaking of wire 3 in the connection wires between the indoorand outdoor units.TroubleshootingWhen abnormality indication starts againIs there any wiring error?YESMatched compatibility?Correct the indoor-outdoor unit connection wiresCheck the indoor and outdoor unit connection wiresCheck the spare part numbers of the indoor and outdoor unitPCBs and compare with their Part ListsChange for the specified indoor or outdoor unitPCBReplace the indoor and outdoor unit PCBsNOYESNOFor safety reason and to preventcomponent breakdown, always switchoff the power before remove andconnect the component.NOIs indoor unit and outdoor unit model numbers matched? Match the compatible model(s)YESCheck indoor and outdoor units model number