ERROR_TIMER_NOT_CANCELED 0x8007021D

Error code 541 · HRESULT 0x8007021D

WINDOWS

An attempt was made to cancel or set a timer that has an associated APC and the subject thread is not the thread that originally set the timer with an associated APC routine.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_TIMER_NOT_CANCELED is a Windows error code (system error 541, returned as HRESULT 0x8007021D) reported by Windows. Its official message is: “An attempt was made to cancel or set a timer that has an associated APC and the subject thread is not the thread that originally set the timer with an associated APC routine.”

How to fix ERROR_TIMER_NOT_CANCELED

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_TIMER_RESOLUTION_NOT_SETERROR_TIMER_RESUME_IGNOREDERROR_WX86_ERRORERROR_UNWINDERROR_WX86_WARNINGWU_E_NOT_APPLICABLEWU_E_PT_WINHTTP_NAME_NOT_RESOLVEDWU_E_PT_HTTP_STATUS_SERVICE_UNAVAIL

Source: Microsoft WinError.h

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