[Solved] "Paused Thermal Anomaly" and "Some problem encountered, Z-leveling enforced" wombo combo  

RE: "Paused Thermal Anomaly" and "Some problem encountered, Z-leveling enforced" wombo combo

It wasn't a waste of money. It actually fixed my problem. I've put 50-60 days of print time on the printer and I have yet to see that error message once since the replacement

Posted by: @allen8355

The problem is the new "thermal model" does not work well, and is too picky for the real world.  Yes, some people have "fixed" it by replacing parts, but there was nothing wrong with your previous parts so you likely wasted your money. All these years we never had a "thermal model" and the world was fine, so there is no sudden need for it now. Its a solution for a problem that doesn't exist.

RE: "Paused Thermal Anomaly" and "Some problem encountered, Z-leveling enforced" wombo combo

Hey there, here were the messages from the live support chat:
"Looking at your second message where you mentioned that the board beeps above 140C and doesn't heat past 160C, it would be an issue with the Einsy board - the MOSFET on it is damaged I'm afraid, not really a hotend issue." 

"So aside from replacing the board, there isn't much else the could be done for this as mosfet repair isn't really possible here."

"It is possible to disable thermal model by issuing commands via serial port so you don't get the message (we don't really recommend this, just letting you know that such an option exists), but it won't fix the main problem."

"realistically only a board replacement would resolve this. If you could get your hands on a multimeter you could double-check the voltages on the PSU and on the heater if they are still OK."

I finally tested with the multimeter the heater while the temperature was going up and there was no issue with the voltage until the thermal model cut everything thus the voltage went from 23.3 to 0, end of story. But I don't get how this can is a test to prove there's a faulty/broken mosfet: a mosfet acts to stabilize the current, there was no oscillation till 140 celsius, and then the firmware cut everything so the voltage dropped to 0.

Does anyone have another explanation, and possibly a solution that does not involve changing the board?

RE: "Paused Thermal Anomaly" and "Some problem encountered, Z-leveling enforced" wombo combo

I don't have an "explanation" and you have likely read what I think of the "thermal model" but I will say a "damaged MOSFET" is a hardware problem. The "thermal model" is Prusa's firmware update to better regulate the hotend temperature, and fixes a "problem" that never existed.  In other-words, if its a hardware problem, there is no firmware fix for it, you need to replace the hardware. Period.  If deactivating the "thermal model" fixes the problem, then there is no hardware problem. I think you understand that, right?  If firmware 3.11.0 "fixes" the problem, then its not a hardware problem. If not, then you DO have a hardware problem.  

RE: "Paused Thermal Anomaly" and "Some problem encountered, Z-leveling enforced" wombo combo

fixes a "problem" that never existed

That‘s not entirely true. Actually it does not fix anything really, it’s designed to detect rarely occurring hardware problems that can cause serious damage to your printer. Unfortunately it is a bit over sensitive in some cases (sometimes due to sloppy calibration, sometimes due to modified hardware, sometimes due to demonic possession).

If it misbehaves you can switch it off or roll back the firmware and be done with it, but if you actually have such a rare hardware issue it’s build to detect you better fix that issue or you will probably end up with a severely damaged printer pretty soon.

RE: "Paused Thermal Anomaly" and "Some problem encountered, Z-leveling enforced" wombo combo

Thank you both!

Allen that's my point exactly: if there's a problem (being the mosfet or whatever) it cannot be solved by firmware, I absolutely agree.

The remaining question is how to accurately double check if there's an hardware problem considering that this voltage drop I saw it's firmware caused, and not and hardware failure 😉 

RE: "Paused Thermal Anomaly" and "Some problem encountered, Z-leveling enforced" wombo combo

Brief (sad) update: went back to firmware 3.11, no thermal model disclaimer, still couldn't complete the pid calibration, the temperature (read) went until 157 then it stuck there although it was clear the temperature kept rising.. Aborted after 5 min of apparent nothing and tried the preheat for pla @210 celsius, same issue until it showed a preheat error on screen while the nozzle was fuming (never saw it before) so I guess the temperature went quite up but the reading stopped at 159 celsius.. Something is definitely off 🙁

RE:

Yeah, if it still doesn't work, I would change the thermistor, if you haven't already.  Then check the wiring carefully. Still no luck, its probably the motherboard.  If the MOSFET was bad, why the temp read incorrectly?  It can only be thermistor, thermistor wiring, or board, but try the cheapest first. 

RE: "Thermal Anomaly" does not appear anymore after going back to 3.11

Hi all, 
uh wow. Thank you for this article!
With Revo Hotend and new 3.14 Firmware I permanently got THERMAL ANOMALY. 
After going back to 3.11, this does not appear anymore. 
Would have been nice if PRUSA would have helped here. 

RE: "Paused Thermal Anomaly" and "Some problem encountered, Z-leveling enforced" wombo combo

Unfortunately this forum rarely see's input from Prusa staff. 

the Chat option is a more direct access to support
regards Joan