Event ID 83: ACPI thermal zone … has … active cooling

Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.

Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.

Try: 4625, 4624, 4740, 6008, 41, 1074, 7045, 1102, 4104, 1149

ACPI thermal zone … has … active cooling.

Event 83

Kernel-Power

System log

Information

Message and fields (as Event Viewer shows them)

ACPI thermal zone … has … active cooling.             
EventTime = …             
_AC0 = …K             
_AC1 = …K             
_AC2 = …K             
_AC3 = …K             
_AC4 = …K             
_AC5 = …K             
_AC6 = …K             
_AC7 = …K             
_AC8 = …K             
_AC9 = …K             
_TMP = …K

VSM Master Key Array Package Read and Unseal From Disk

Event 83

Kernel-Boot

System log

Information

Message and fields (as Event Viewer shows them)

VSM Master Key Array Package Read and Unseal From Disk

Status: …
OsDeviceId: …
SystemRoot: …
VsmLKeyRelPath: …
LatchedUnsealPolicyRelPath: …
UnlatchedUnsealPolicyRelPath: …
LatchedPrimaryProtectorVariableName: …
LatchedSecondaryProtectorVariableName: …
UnlatchedPrimaryProtectorVariableName: …
UnlatchedSecondaryProtectorVariableName: …
LatchedProtectorUsedLocal: …
LatchTheUnlatchedLocal: …
UnsupportedRollbackLocal: …
UpgradedAntirollbackPolicyExistsLocal: …
PkgWasCorruptOrUnavailableLocal: …
CreationStateVerifiedLocal: …
PrimaryProtectorTargetPcrSealMaskLocal: …
LatchedProtectorExists: …
UnlatchedProtectorExists: …
KeyPkgIdTpmCounterValue: …
ActivePolicyVersion: …
UseUnlatchedProtector: …
NeedToResealPrimaryProtector: …
NeedToResealSecondaryProtector: …
NeedToResealPca2023Protector: …

Substatus

PrimaryBlobUnsealStatus: …
BackupBlobUnsealStatus: …
Pca2023ProtectorUnsealStatus: …
BackupBlobValidityCheckStatus: …
BackupBlobStillValid: …
Pca2023ProtectorValidityCheckStatus: …
Pca2023ProtectorStillValid: …
PrimaryBlobResealStatus: …
BackupBlobResealStatus: …
Pca2023ProtectorResealStatus: …
V2ProtectorsUsed: …
LegacyUefiVarQueryStatus: …
LegacyUefiVarCleanupStatus: …
ActivePolicyVersion: …
LatchedPolicyVersion: …
UnlatchedPolicyVersion: …
LatchedUnsealPolicyValid: …

Latched unseal policy

Version: …
VarDataOffset: …
StructureSize: …
PolicyVersion: …
PolicyHashLength: …
WinloadSVN: …
WinresumeSVN: …
BootmgrSVN: …
LKeyPkgId: …
UnlatchedUnsealPolicyValid: …

Unlatched unseal policy

Version: …
VarDataOffset: …
StructureSize: …
PolicyVersion: …
PolicyHashLength: …
WinloadSVN: …
WinresumeSVN: …
BootmgrSVN: …
LKeyPkgId: …

BITS defaulted group policy value

Event 83

Bits-Client

Bits-Client/Operational log

Information

Message and fields (as Event Viewer shows them)

BITS defaulted group policy value … : ….