Steam Machine, Red LED and Thermal False Positives: The Next BIOS Update Will Set the Threshold to 100 °C

Valve aims to soon introduce a BIOS update for its Steam Machines, intended to address an anomalous behavior of the front diagnostic lighting system.

According to an official confirmation from the Steam Support, the current version of the firmware tends to prematurely activate the fixed red LED thermal alert indicator compared to the nominal operating parameters set by the manufacturer.
"After discussing it with our engineers, it has emerged that there is a known issue with the current BIOS that causes the red LEDs to turn on much earlier than expected. The problem solely concerns when the LEDs are programmed to turn on. […] For your information, the Steam Machine will start to throttle performance at 100 °C for CPU and GPU and will shut down to protect itself if temperatures exceed that threshold."
"A BIOS update is being developed and will be released soon, correcting the behavior of the red LED indicators, setting them to 100/100 °C for CPU and GPU instead of the current 95/90 °C."

The response came following a report from a user who noticed the red bar turning on during a gaming session. However, real-time analysis via hardware performance overlay highlighted a normal thermal state for the key components: the GPU recorded a temperature of 75 °C (with a maximum junction at 91 °C and VRAM at 88 °C), while the CPU was at 81 °C. These values fall well within safety tolerances.

Currently, Valve has not released a precise distribution date for the new firmware; Steam Support has only indicated that the patch is being finalized and will be released in the near future. It is worth specifying that this change will not impact the operating frequencies, fan curves, or actual chip temperatures, but will only correct the activation threshold for the visual notification.
With the new update, the activation of the red light will thus coincide with the actual onset of protective throttling, avoiding false alarms during intensive workloads. In recent weeks, the Steam Machine's red LED had already been in the spotlight: initially thought to indicate a serious fault in the system, reminiscent of what happened with the early XBOX 360s, it was later clarified that the issue was related to an incorrect BIOS update.