Code UA: Defect of indoor/outdoor power supply
Issue Description & Safety Warning
The Daikin SM-TS3 HVAC Self-Diagnosis has triggered a critical Defect of indoor/outdoor power supply 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
Unit area: System Product scope: RA, SkyAir, VRV, Package, Heat reclaim ventilator, Chiller, Fan Coil Chart object marker: k Supposed causes: - indoor and outdoor unit - Wrong model connections - Improper power supply - Wrong PCB connected - Defective PCB Alternate definition (System): Improper combination of indoor and outdoor units Chart object marker: kkkk Supposed causes: - Excess of connected indoor units - Defective outdoor unit PCB - Mismatch of the refrigerant type of indoor and outdoor unit - Setting of outdoor unit PCB was not carried out after Alternate definition (System): Remote temperature setting wire disconnection Chart object marker: k Supposed causes: - replacing to spare PCB - Remote temperature setting wire disconnection - Defective connector contact
Source: Daikin SM-TS3 Simple Self-Diagnosis by Malfunction Code chart
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Daikin SM-TS3 HVAC Self-Diagnosis Alarms
Daikin controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code UA on the SM-TS3 HVAC Self-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: 139 Daikin SM-TS3 HVAC Self-Diagnosis codes.
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