This read-only display string reports the state of the Thermal Probe Alarm for the Dc1 plant, sourced from the TPA1 alarm point. It signals a problem with a thermal sensing probe used for temperature-compensated battery charging, such as a failed or disconnected probe. For example, an active alarm here would prompt an admin to check the physical thermal probe wiring on the battery string before trusting the plant's temperature-based charging adjustments.