Supermicro SuperServer SYS-211E-FRN13P User Manual page 63

Overheat LED Header
Header JOH1 is used to connect to an LED indicator to provide warnings of chassis
overheating and fan failure. This LED will blink when a fan failure occurs. Refer to the tables
below for pin definitions.
Overheat LED Header Status
State Definition
Solid Overheat
Blinking Fan Fail
Chapter 4: Motherboard Connections
Overheat LED Header
Pin Definitions
Pins Signal
Pull high to +3.3
1 V power through
330-ohm resistor
2 OH Active
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