[BUG] MMU3 Enabled - MMU3 Filament load error, Retry doesn't Heat Hotend before Retying

[SpankyDevil]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

If MMU3 throws an error during Printing for example "FSENSOR DIDN'T TRIGG." The Extruder goes to Parking Position
If you have #define HOTEND_IDLE_TIMEOUT enabled Hotend cools down.
the screen displays Retry or More Info.

If you don't catch this error straight away the Hotend and Bed cooldown then when you click to Retry, The MMU3 starts to Load the Filament cold.

Bug Timeline

when MMU3 feature was merged

Expected behavior

Click Retry,
Extruder and Bed heat up then MMU3 Loads Filament and Print Continues

Actual behavior

As Above in Description

Steps to Reproduce

Trigger MMU3 Error, wait till Hotend and Bed cooled down then retry.

Version of Marlin Firmware

Marlin bugfix-2.1.x (Sep 3 2024 09:30:57)

Printer model

Prusa MK3S+ Clone

Electronics

SKR 3, TMC2209

LCD/Controller

BTT TFT50 V3.0

Other add-ons

Prusa MMU3

Bed Leveling

ABL Bilinear mesh

Your Slicer

Prusa Slicer

Host Software

None

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

Marlin.zip

[thisiskeithb]

In your original issue (#27412), you reported that:

If you don't catch this error straight away the Hotend and Bed cooldown then when you click to Retry, The MMU3 starts to Load the Filament and causes Marlin to reboot

Does Marlin no longer reboot when trying to load filament cold?

[thisiskeithb]

Duplicate of #27396

[thisiskeithb]

Please use #27396 for any and all MMU3-related + Marlin rebooting when cold issues