Power Panic #26321 (MK4S) #13321 (MK4) #27321 (MK3.9S) #213…

What happened?

The Original Prusa printers are equipped with a Power Panic feature. This feature can recover a print in case of a sudden power loss (read more about it here). The power panic cable goes from the printer's PSU to the xBuddy board. In case there is any damage to the cable, the printer will show "Power panic has been detected during printer initialization. Inspect wiring of PP-cable.".

Error name: Power Panic

Error code: #26321 (MK4S) #13321 (MK4) #27321 (MK3.9S) #21321 (MK3.9) #28321 (MK3.5S) #23321 (MK3.5) #31321 (CORE One)

How to fix it?

Check the connection of the cable both on the PSU and on the xBuddy board. Make sure that the cable is not damaged.

There are two versions of the power panic cable, one with only a black wire and one with black and white wires. Both are compatible with the CORE One, MK4/S, MK3.9, and MK3.5, and there is no need to switch to one or the other.

5 comments

Denis Ferrari

•

Just changed the xbuddy with newer version one and - having single wire power panic cable - on startup printer remains locked with POWER PANIC alarm. 2 wires power panic cable is needed...and Prusa should have sent it together with the xbuddy...but it did not.

aard

•

I've spent a lot of time trying to figure this issue out on first startup - until I double checked the supplied cable, and realized the cable had the wires switched. There are small locking tabs in the cutout of the plug, which allows the wires to be removed and switched.

Doc

•

I am getting this error on startup after upgrading to MK4. I checked the end to end continuity on the wires as well as ensuring that both ends were properly seated. I am still getting the error and have no way to bypass it.

CatBenny

•

I just pressed the reset button. Now it works perfectly fine.

tfhh

•

I want to use my own power supply which hasn´t a Power Panic connector. My former MK3S+ works fine without the PP cable connected, the MK4 not. How can I disable the Power Panic check of the MK4 firmware?

David B.

•

Hi! The printer should work the same with the PP cable disconnected.

djcody

•

It does not. You're right though: it should.

DeKemp

•

But it doesnt....

David B.

•

Hi! You’re right. The newer versions of the xBuddy board behave like that. I have forwarded your concern to the respective product manager to take care of. Thanks for the notification.

GambitPunk

•

Was there any resolution on this? I can't get my MK4S to get past the power panic check after you guys sent me a new version of the Xbuddy on warranty. Would love to just skip that check while we troubleshoot what's going on

just4jordan

•

Ground the white pin from the PP cable and the panic screen will get bypassed

Jakub Dolezal

•

Hi, I suggest using the official parts and not altering them.