Code LC-31: Transmission error (Between outdoor units, inverter PCB 2) (Slave 1)
Issue Description & Safety Warning
The Daikin RXQ6-48A(N)R / RXQ-ARYFK Service Diagnosis has triggered a critical Transmission error (Between outdoor units, inverter PCB 2) (Slave 1) alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Product scope: RXQ6-48A(N)R / RXQ-ARYFK service diagnosis Unit area: Outdoor unit/system Manual section: Part 6 Service Diagnosis, 5.2 Error Codes (Sub Codes) Diagnosis: Refer to the LC flowchart and make a diagnosis based on the Error code shown to the left.
Source: Daikin RXQ6-48A(N)R Series Service Manual (SiME341909EA), Part 6 Service Diagnosis
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Daikin RXQ6-48A(N)R / RXQ-ARYFK Service Diagnosis Alarms
Daikin controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code LC-31 on the RXQ6-48A(N)R / RXQ-ARYFK Service Diagnosis identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Daikin's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 362 Daikin RXQ6-48A(N)R / RXQ-ARYFK Service Diagnosis codes.
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