Overview
A software revision has been implemented for the ARTC72LATU and ARTC90LATU indoor units.
The update addresses an operational issue that occurred even when a converter was not connected, requiring further system analysis and software improvement
Changing software had been occu…
.
Applicable Models and Serial Ranges
| Model | Serial Number From |
|---|---|
| ARTC90LATU | T005237 and above |
| ARTC72LATU | T006422 and above |
Units produced from these serial numbers onward are equipped with the new software version
Software Identification
| Description | Before Modification | After Modification |
|---|---|---|
| Software ID | 9708460031 | 9708460048 |
| Software Label | F01 | F02 |
If the control PCB has a marking (red dot) beside the IC, this indicates that the software was rewritten at the factory
Changing software had been occu…
.
Confirmation Method
Visually inspect the indoor PCB.
Check the printed software number on the IC chip.
Verify whether the marking is present to confirm factory-updated software.
(See reference images on page 1 of the document for IC and marking locations.)
Action Required
For stock units produced prior to the above serial numbers, update the indoor PCB software to the latest version (9708460048 / F02).
Ensure all field service replacements match the latest software to maintain compatibility and performance.