Return Air Sensors Out-of-Range (RAT and RAT2)

A configured redundant return air sensor is not reading within (2° C); if RAT2 is active, the unit switches active probe to RAT.

A Redundant Return Air Temperature Sensor (RAT2) is installed, configured, and is not reading with (2° C).

Engine and Electric Operation: If RAT2 is selected as the active probe, switch active probe to RAT probe.

Auto reset when sensor is in range or, alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.