Knowledge

ERROR_TIMER_RESUME_IGNORED - 722 (0x2D2)

The resumable flag to a timer API was ignored.

Updated: Feb 21, 2026

Technical Meaning

The ERROR_TIMER_RESUME_IGNORED error code indicates that a resumable flag provided to a timer API was not honored. This typically means the system did not resume or continue processing of a previously paused timer.

Error Details

This error is specific to operations involving timers in the Windows operating system. It suggests that an attempt was made to resume a timer, but the operation failed because the resumable flag was ignored. This could occur due to various reasons such as invalid parameters or system limitations.

Usage Context

The ERROR_TIMER_RESUME_IGNORED error is relevant in scenarios where timers are used for scheduling tasks or events. Common APIs that may generate this error include those related to the Windows Timer API, such as SetTimer, KillTimer, and CancelTimerQueueTimer.

Developer Interpretation

When encountering ERROR_TIMER_RESUME_IGNORED, developers should consider the following:

  • Verify that the timer handle is valid and correctly obtained.
  • Ensure that the resumable flag was set appropriately before attempting to resume the timer.
  • Check if there are any system limitations or constraints that might prevent the timer from being resumed.

Related Errors

  • ERROR_TIMER_NOT_RESUMED (721): Indicates a similar scenario where a timer could not be resumed due to an internal error.
  • ERROR_INVALID_PARAMETER (1208): May indicate that one or more parameters passed to the API were invalid, leading to this error.

FAQ

Q: What does ERROR_TIMER_RESUME_IGNORED mean?

A: It indicates that a resumable flag provided to a timer API was ignored, preventing the timer from being resumed.

Q: How can I troubleshoot this issue?

A: Review the parameters passed to the timer API and ensure they are valid. Check if there are any system limitations or constraints affecting the operation.

Summary

ERROR_TIMER_RESUME_IGNORED is a specific error code that occurs when attempting to resume a timer using an ignored resumable flag. Developers should verify their parameter usage and check for any system limitations to resolve this issue.