T999_O: Unknown Inverter Fault
This inverter fault is an erroneous fault that does NOT impact the system operation in any way. This fault may only appear in history and may be ignored by users and servicers. The fault may show up in history after a power cycle or when service has been performed.
You may update the VSODU (Econet Board in outdoor unit) making sure to have version AC-VHSP-00-01-69 in it. This is for A models only (-)A17, (-)A20, and (-)P20**A models. Current PN 47-10484-09K
For (-)P20**B models you will need a VSODU with version AC-VSG2-00-01-15 or later. Current PN 47-104848-10K
