Luxaire AC shows F2; the outdoor unit may not start or may shut down shortly after starting.

Safety: Turn off power at the outdoor disconnect.

• Find the ambient sensor: On Luxaire condensers, the ambient sensor is typically mounted near the coil or on the control panel, exposed to outdoor air.
• Inspect wiring: Check for rodent damage, UV cracking, or loose connectors. Reseat the plug on the outdoor control board.
• Replace sensor if needed: If the sensor body is cracked or wires are broken, replace it with the OEM Luxaire ambient thermistor. Route the new sensor away from hot discharge air.
• Restart system: Restore power and command cooling. If F2 clears, monitor operation. If it returns, the outdoor board may be misreading and require replacement.