# BlockingIOError: Error 11 - Printer refuses to do anything, throwing "verify\_heater" error **URL:** \ **Category:** General Discussion\ **Created:** [April 10, 2026, 1:51am UTC](https://klipper.discourse.group/t/blockingioerror-error-11-printer-refuses-to-do-anything-throwing-verify-heater-error/25854 "2026-04-10T01:51:34Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![stupidcomputer](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/stupidcomputer/32/22103_2.png) [@stupidcomputer](https://klipper.discourse.group/u/stupidcomputer)\ **Post date:** [April 10, 2026, 1:51am UTC](https://klipper.discourse.group/t/blockingioerror-error-11-printer-refuses-to-do-anything-throwing-verify-heater-error/25854/1 "2026-04-10T01:51:34Z")
Printer Model: Creality Ender 3 v2 Neo MCU / Printerboard: BTT SKR Mini E3 V3 Host / SBC – Raspberry Pi Model 4b [klippy.log](https://klipper.discourse.group/uploads/short-url/nDF61vKRhtYEz8bwWOttb2NZtm9.log) (1.6 MB) [moonraker.log](https://klipper.discourse.group/uploads/short-url/dIfk4UXsPNeN8CMmtqN2cFpDFF4.log) (115.5 KB)\* \*_I don’t know if this will have much use for you, but I saw other posts attaching it so I decided it would probably be of some use_ Been dealing with my printer throwing a “verify heater” error, and was led down a rabbit hole of solving this. I have messed with my Verify\_Heater settings, trying to figure out or fix the issue (with no avail, of course). After checking my log, I found an issue with the MCU, but I was able to fix it–at least I believe. I looked over frenk.salvi’s issue, being that it threw the same error, and I was able to fix it that way. I also took a quick look over Cowboy124aa’s issue, but their action seemed more like a last resort (of which I am willing to treat as a last resort). However, after my “fix” I received the error: “BlockingIOError: [Errno 11] Resource temporarily unavailable.” In my searching throughout this site, I have not found anything covering this error specifically. A Reddit post states that they had a loose thermsistor, but I have verified that is not the issue. I would note that I have recently changed the nozzle, and the printer stopped working after the replacement, which could hint at damage (I would hope not, but I don’t mind to fix it) to the nozzle or an issue with something else that the printer does not like. I will need to replace the nozzle with the old one to see if that solves the issue,\*\* but the log seems to be hinting that the issue is dealing with software rather than hardware. As of current, I feel I have made at least some progress, but I am unsure of my next steps. I unfortunately cannot do much with my printer because of this error, and I am relatively new to all of Klipper, which is why I’ve come here. I don’t understand everything, so any help with understanding and also avoiding this issue in the future would be greatly appreciated. \*\*_I will reply with an update if necessary_ ---
**Author:** ![stupidcomputer](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/stupidcomputer/32/22103_2.png) [@stupidcomputer](https://klipper.discourse.group/u/stupidcomputer)\ **Post date:** [April 10, 2026, 1:53am UTC](https://klipper.discourse.group/t/blockingioerror-error-11-printer-refuses-to-do-anything-throwing-verify-heater-error/25854/2 "2026-04-10T01:53:35Z")
Here are the links to resources I mentioned above: - [frenk.salvi’s issue](https://klipper.discourse.group/t/problem-mcu-mcu-unable-to-connect/17929) - [Cowboy124aa’s issue](https://klipper.discourse.group/t/skr-mini-e3-v3-0-mcu-problems/3845) - [Reddit post](https://www.reddit.com/r/klippers/comments/1e5eqqj/rescheduled_timer_error_in_klipper/) ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [April 10, 2026, 7:39am UTC](https://klipper.discourse.group/t/blockingioerror-error-11-printer-refuses-to-do-anything-throwing-verify-heater-error/25854/3 "2026-04-10T07:39:11Z")
Hello @stupidcomputer and welcome to the forum! The heating up of the extruder is quite slow. It takes 3 minutes from about 50°C up to 200°C. ![grafik](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/8/b/8b70c86ac0b1d8b18cd1722328ff052260f9a4b9.png) Usually it is below a minute (on my system from 23°C to 215°C in about 30 seconds) Do you run a heater cartridge that the PSU is not able to provide power for. E.g. a 24V heater on a 12V system. Maybe the PSU is underpowered. * * * BTW: You should cool the Pi. ```auto raspberry_pi: temp=66.2 ``` ---
**Author:** ![stupidcomputer](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/stupidcomputer/32/22103_2.png) [@stupidcomputer](https://klipper.discourse.group/u/stupidcomputer)\ **Post date:** [April 10, 2026, 3:37pm UTC](https://klipper.discourse.group/t/blockingioerror-error-11-printer-refuses-to-do-anything-throwing-verify-heater-error/25854/4 "2026-04-10T15:37:57Z")
I do not believe so, my head is stock. (It was replaced a bit ago, but I never had any issues until I switched the nozzle) Also, thank you for the recommendation; I’ll see what I can do there. ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [April 10, 2026, 4:14pm UTC](https://klipper.discourse.group/t/blockingioerror-error-11-printer-refuses-to-do-anything-throwing-verify-heater-error/25854/5 "2026-04-10T16:14:03Z")
> [@stupidcomputer](#): > > until I switched the nozzle Then you may check if the thermistor still seated properly. ---
**Author:** ![cardoc](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@cardoc](https://klipper.discourse.group/u/cardoc)\ **Post date:** [April 10, 2026, 5:57pm UTC](https://klipper.discourse.group/t/blockingioerror-error-11-printer-refuses-to-do-anything-throwing-verify-heater-error/25854/6 "2026-04-10T17:57:11Z")
> [@EddyMI3D](#): > > Then you may check if the thermistor still seated properly. If the thermistor is still properly located check for broken strands in the wires to the heating element. Your heater is defiantly not working correctly. FWIW - A misplaced thermistor is EXACTLY the failure mode [verify\_heater] is intended to detect. ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [June 9, 2026, 5:57pm UTC](https://klipper.discourse.group/t/blockingioerror-error-11-printer-refuses-to-do-anything-throwing-verify-heater-error/25854/7 "2026-06-09T17:57:30Z")
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