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Voltage Battery (VBAT) Lower Critical Sensor Threshold Asserted Error

Content Type: Maintenance & Performance   |   Article ID: 000007344   |   Last Reviewed: 04/19/2024

Voltage Battery (VBAT) is supplied by the CMOS battery when AC power is off (Battery voltage is 3.0 V) and by the main board when AC power is on (Battery voltage is 3.3 V).

If a message such as VBAT: Lower Critical sensor threshold asserted or SN:BB +3.3V Vbat ST:Voltage ED:Lower Non-critical - going low ET:Asserted is seen, proceed as follows:

  1. Clear the CMOS. Refer to the board technical document for information about doing this. Alternatively, refer to the How do I clear CMOS? section on the How to Clear CMOS to Reset BIOS Settings in Systems with Intel® Desktop Boxed Processors page.
  2. If this does not resolve the issue, follow How to Replace the Complementary Metal-Oxide-Semiconductor (CMOS) or System Battery on Intel® Server Board Family? to replace the CMOS battery.


More information

The VBAT sensor monitors voltage from the CMOS battery, a coin-sized battery on the baseboard. An error is logged in the Event Log if the voltage drops below the threshold in the Sensor Data Record (SDR) file. Refer to Table 13 of the System Event Log Troubleshooting Guide for the latest board models for more information.

Related Products

This article applies to 70 products.
Intel® Server Board S2600KP Family Intel® Server Board S1400SP2 Intel® Server Board S1400SP4 Intel® Server Board D40AMP Intel® Server Board S2600WFR Intel® Server Board D50DNP Intel® Server Board S2600ST Intel® Server Board M10JNP Intel® Server Board M10JNP2SB Intel® Server Board S1400SP Family Intel® Server Board M50FCP Intel® Server Board S2600WFTF Family Intel® Server Board D50TNP Intel® Server Board M20NTP Intel® Server Board S2600TP Family Intel® Server Board S2600BPR Server Boards Intel® Server Board M50CYP Intel® Server Board S2600WFTF

Discontinued Products

Intel® Server Board S2600KPF Intel® Server Board S2600BPQ Intel® Server Board S1200SPLR Intel® Server Board S2600CW2S Intel® Server Board S2600CW2SR Intel® Server Board S2600WFQR Intel® Server Board S7200AP Intel® Server Board S7200APR Intel® Server Board S2600STQ Intel® Server Board S2600BPQR Intel® Server Board S2600STQR Intel® Server Board S2600TPFR Intel® Server Board S2600WFTR Intel® Server Board S2600KPFR Intel® Server Board S2600BPB Intel® Server Board S2600WT2R Intel® Server Board S2600STS Intel® Server Board S1200SP Family Intel® Server Board S2600CW2 Intel® Server Board S2600TPR Intel® Server Board S1200SPOR Intel® Server Board S2600KP Intel® Server Board S2600TPF Intel® Server Board S2600STBR Intel® Server Board S1200SPL Intel® Server Board S2600KPR Intel® Server Board S2600CWTSR Intel® Server Board S2600STB Intel® Server Board S2600WFT Intel® Server Board S1200SPS Intel® Server Board S2600WF0R Intel® Server Board S2600STK Intel® Server Board S1200SPO Intel® Server Board S2600CWTS Intel® Server Board S1200SPSR Intel® Server Board S2600BPSR Intel® Server Board S2600WT Family Intel® Server Board S2600WTT Intel® Server Board S2600CW Family Intel® Server Board S2600BPBR Intel® Server Board S2600WTTR Intel® Server Board S2600TP Intel® Server Board S2600CW2R Intel® Server Board S2600WT2 Intel® Server Board S2600CWTR Intel® Server Board S2600CWT Intel® Server Board S2600WF0 Intel® Server Board S7200AP Family Intel® Server Board D40AMP1SB Intel® Server Board S2600BPS Intel® Server Board S2600WFQ

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