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Event ID 88: The system was hibernated due to a critical thermal event

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

The system was hibernated due to a critical thermal event.

Event 88
Kernel-Power
System log
Error
Message and fields (as Event Viewer shows them)
The system was hibernated due to a critical thermal event.
Hibernate Time = …             
ACPI Thermal Zone = …             
_HOT = …K

Read and Unseal Master Key Array Package Status

Event 88
Kernel-Boot
System log
Information
Message and fields (as Event Viewer shows them)
Read and Unseal Master Key Array Package Status

Status: …
OsDeviceId: …
OsDataDeviceId: …
SystemRoot: …
VsmLKeyRelPath: …
LatchedUnsealPolicyRelPath: …
UnlatchedUnsealPolicyRelPath: …
LatchedPrimaryProtectorVariableName: …
LatchedSecondaryProtectorVariableName: …
UnlatchedPrimaryProtectorVariableName: …
UnlatchedSecondaryProtectorVariableName: …
LegacyMainBlobVariableName: …
LegacySecondaryProtectorVariableName: …
LatchedProtectorUsedLocal: …
LatchTheUnlatchedLocal: …
UnsupportedRollbackLocal: …
UpgradedAntirollbackPolicyExistsLocal: …
FirstWriteToDiskLocal: …
WritePkgToUefiLocal: …
PkgWasCorruptOrUnavailableLocal: …
KeysAreLegacyLocal: …
CreationStateVerifiedLocal: …
PrimaryProtectorTargetPcrSealMaskLocal: …

Substatus

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