General Assist Technical Reference
V-Series Outdoor Unit - New Functions, Error Displays & Software Mismatch
Service Bulletin VRF-0087-02 - issued 27 April 2010
This bulletin introduced new outdoor-unit software functions and error displays for VRF V-series outdoor units, including network communication behaviour and software-version mismatch indication.
Quick Answer
| Product | VRF outdoor unit - V series |
| Models | All applicable VRF-V series listed below |
| New function | DIP-SW7-2 changes system response to network communication errors on the master outdoor unit |
| Reset function | DIP-SW6-4 resets the stored maximum indoor-unit count |
| Indoor-unit shortage error | Code 14.5 - LED1 high-speed flash + LED6 3 flashes |
| Network communication error | LED1 high-speed flash + LED5 9 flashes |
DIP-SW7-2 - Network Communication Error Operation
This setting applies to the master outdoor unit only.
| Setting | System Behaviour |
|---|---|
| OFF | If the number of communicating indoor units decreases from the quantity detected at power ON, Indoor unit shortage error is displayed and the system stops. If communication is lost with an indoor unit during normal operation, Network communication error is displayed and the system stops. |
| ON | If the number of communicating indoor units decreases from the quantity detected at power ON, Indoor unit shortage error is displayed but the system does not stop. If communication with all indoor units is lost during normal operation, Network communication error is displayed and the system stops. |
Important: The bulletin instructs that DIP-SW7-2 should be set to OFF. Continuing to operate with this switch ON may create a risk of compressor failure.
DIP-SW6-4 - Maximum Indoor Unit Count Reset
DIP-SW6-4 resets the stored value for the maximum number of indoor units.
| Reset action | Change DIP-SW6-4 from OFF to ON |
| Normal position | After reset, return DIP-SW6-4 to OFF |
New Error Displays
These displays apply from software version E01BV11L11 and later.
| Error | Code | LED Display |
|---|---|---|
| Indoor unit shortage | 14.5 | LED1: high-speed flash LED6: 3 flashes |
| Network communication error | - | LED1: high-speed flash LED5: 9 flashes |
Applicable Models
The bulletin identifies the following V-series outdoor units and serial-number starting points.
| Model | Serial Number | Model | Serial Number |
|---|---|---|---|
| AJYA72LATF | T001168~ | AJYA72LBTF | T000144~ |
| AJYA72UATF | T001075~ | AJYA72UBTF | T000133~ |
| AJYA90LATF | T002398~ | AJYA90LBTF | T000455~ |
| AJYA90UATF | T001497~ | AJYA90UBTF | T000337~ |
| AJY126LATF | T002997~ | AJY126LBTF | T001014~ |
| AJY126UATF | T001714~ | AJY126UBTF | T000411~ |
| AJGA72LATF | T000305~ | AJGA72LBTF | T000028~ |
| AJGA72UATF | T000250~ | AJGA72UBTF | T000117~ |
| AJGA90LATF | T000650~ | AJGA90LBTF | T000143~ |
| AJGA90UATF | T000287~ | AJGA90UBTF | T000279~ |
| AJG126LATF | T000705~ | AJG126LBTF | T000369~ |
| AJG126UATF | T000707~ | AJG126UBTF | T000250~ |
| AJQA72LBTF | T000041~ | AJQA72UBTF | T000236~ |
| AJQA90LBTF | T000210~ | AJQA90UBTF | T000511~ |
| AJQ126LBTF | T000796~ | AJQ126UBTF | T000575~ |
The serial number shown is the product serial corresponding to shipment from the factory. Units rewritten with software E01BV11L11 after shipment are also included.
Outdoor Unit Software Mismatch
When 2 or 3 outdoor units are connected in one refrigerant system, all outdoor units must be rewritten to the latest software version.
Important: Rewriting to the latest software is treated the same as replacing the PCB with one already programmed with the latest version.
If different software versions are present within the same refrigerant system, an outdoor-unit software mismatch indication can occur.
Software Version Categories
| Category | Software Version | Error Display |
|---|---|---|
| I | Up to E01BV11L07 | No indication |
| II | E01BV11L08 to E01BV11L11 | LED1 high-speed flash + LED5 11 flashes |
| III | E01BV11L12 and later | LED1 high-speed flash + LED5 12 flashes |
Mismatch Examples
| Example | Master | Slave 1 | Slave 2 |
|---|---|---|---|
| 1 | E01BV11L10 LED1 high-speed flash + LED5 11 flashes | E01BV11L10 LED1 high-speed flash + LED5 11 flashes | E01BV11L12 LED1 high-speed flash + LED5 12 flashes |
| 2 | E01BV11L11 LED1 high-speed flash + LED5 11 flashes | E01BV11L12 LED1 high-speed flash + LED5 12 flashes | E01BV11L12 LED1 high-speed flash + LED5 12 flashes |
| 3 | E01BV11L12 LED1 high-speed flash + LED5 12 flashes | E01BV11L07 No indication | E01BV11L07 No indication |
Service Action for Software Mismatch
- Confirm the software version of every outdoor unit connected to the refrigerant system.
- Identify whether different software versions or categories are present.
- Rewrite the outdoor unit(s) that do not have the latest software.
- Ensure all outdoor units in the same refrigerant system are on the latest software version.
- Confirm the mismatch error indication has cleared.
Diagnostic note: LED1 high-speed flash + LED5 12 flashes clears when the outdoor-unit software mismatch is corrected. The bulletin notes that this LED5 12-flash mismatch indication does not occur where all units are already on the latest software.
If the connected outdoor units are all within the same software-version category, the software mismatch error may not occur even if the exact software revisions differ. The bulletin still instructs technicians to update all outdoor units to the latest software.
Important: When updating a multi-outdoor-unit VRF system, do not update only one outdoor unit. Confirm and align the software revision across all outdoor units connected to the same refrigerant system.