What It Means
- The refrigerant detection system sensor is of an incorrect type.

Split & Multi-Split:
The sensor of the refrigerant detection system is of a type not suitable for use in the application. Replace the sensor with a Lennox approved replacement part. This fault clears when a sensor suitable for the application is detected by the refrigerant detection system, but will latch for a minimum of 5 minutes. Retest of the presence of the fault can be effected by pressing the RDS test button on the indoor unit control board.
The refrigerant detection system sensor is of an incorrect type.
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