# Missed scheduling of next digital out event

**URL:** <https://klipper.discourse.group/t/missed-scheduling-of-next-digital-out-event/14775>\
**Category:** Knowledge Base\
**Created:** [March 9, 2024, 8:01am UTC](https://klipper.discourse.group/t/missed-scheduling-of-next-digital-out-event/14775 "2024-03-09T08:01:14Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\
**Post date:** [March 9, 2024, 8:01am UTC](https://klipper.discourse.group/t/missed-scheduling-of-next-digital-out-event/14775/1 "2024-03-09T08:01:14Z")

</div>

## Missed scheduling of next digital out event

### Background

When the host activates a heater on the MCU (`heater_pin` is set high), the MCU will request a confirmation every 5 seconds to secure that the heater is intended to be active.  
This safety measure ensures that the host and MCU are aligned on the activated heaters. Failure to receive this confirmation in a timely manner will result in the `Missed scheduling of next digital out event` error.

### Reasons

Typically, the potential reasons for the error are on the host side and are similar to the [Timer too close](https://klipper.discourse.group/t/timer-too-close/6634/1) causes.

### Potential solutions

See [Timer too close](https://klipper.discourse.group/t/timer-too-close/6634/1) for items to check.