Lenovo ThinkSystem SD650 Manual page 216

Complete the following steps:
1. If error is not de-asserted after several minutes, check all ten fans are installed.
2. Reseat fan module one or two times. If error still persist, replace fan module.
• 16 : FAN_Tach_4A: Fan sensor, failure event was asserted, reading value : %RPM (Threshold :
1472RPM)
Asserted when Fan tach reading is below threshold RPM.
Severity
Critical
Serviceable
Automatically notify support
User Action
Complete the following steps:
1. If error is not de-asserted after several minutes, check all ten fans are installed.
2. Reseat fan module one or two times. If error still persist, replace fan module.
• 17 : FAN_Tach_4B: Fan sensor, failure event was asserted, reading value : %RPM (Threshold :
1472RPM)
Asserted when Fan tach reading is below threshold RPM.
Severity
Critical
Serviceable
Automatically notify support
User Action
Complete the following steps:
1. If error is not de-asserted after several minutes, check all ten fans are installed.
2. Reseat fan module one or two times. If error still persist, replace fan module.
• 18 : FAN_Tach_5A: Fan sensor, failure event was asserted, reading value : %RPM (Threshold :
1472RPM)
Asserted when Fan tach reading is below threshold RPM.
Severity
Critical
Serviceable
Automatically notify support
User Action
Complete the following steps:
1. If error is not de-asserted after several minutes, check all ten fans are installed.
2. Reseat fan module one or two times. If error still persist, replace fan module.
• 19 : FAN_Tach_5B: Fan sensor, failure event was asserted, reading value : %RPM (Threshold :
1472RPM)
Asserted when Fan tach reading is below threshold RPM.
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ThinkSystem SD650 Dual Node DWC Tray and NeXtScale n1200 DWC Enclosure Messages and Codes Reference