Rheem inverter air conditioner displays F1 and may shut down during high load conditions.

Safety first: Turn off power to the indoor unit before removing covers.

• Locate sensor: Open the front panel and remove filters. The room sensor is usually near the air intake, clipped to the plastic housing or behind the grille.
• Check position: Ensure the sensor is not touching the coil or metal parts and is exposed to return air. Reposition if necessary.
• Inspect wiring: Follow the sensor leads to the PCB. Look for breaks, pinches, or loose connectors. Repair or reseat as needed.
• Measure resistance: Disconnect the sensor and measure resistance at room temperature. Compare to Rheem’s chart. Replace if open, shorted, or out of range.

Warning: Incorrect sensor readings can cause poor comfort control and compressor stress. Use only the correct Rheem replacement sensor.