Unlike atiRedundantPowerStatus, which reports basic presence and health of the external redundant PSU, this object specifically flags whether that redundant unit's own fan has failed or it has overheated, a narrower alarm condition folded into a single TruthValue. An admin who sees this true(1) knows the redundant supply's own cooling is the problem, not necessarily its DC output, which changes the troubleshooting path toward checking the RPS's fan rather than swapping the whole unit outright. This distinction matters because a redundant PSU that's overheating but still outputting power will eventually derate or shut down if left unaddressed.