My K2 has been sitting idle for 3+ weeks now, with the extruder motor presumably dead.
It doesn’t rotate at all and it happened right after it started reporting problems with the heat fan.
No matter if I try to use the cfs, CP5 or CP6, or even from the touch screen, the extruder motor is dead.
I have been trying to reach tech support with every known to me communication methods with no response.
So, my last hope to find out what’s wrong (besides using other means to protect my consumer rights) is the community.
Are there any troubleshooting methods to try and pinpoint if the problem is with the motor, the board or perhaps the software?
Is the material sensor light on? I found 2-3mm clear plastic shards holding the sensor swing flag and locking mine out. Also, I assume you are watching the servo drive wheel dots when you manually try to work it? And, check the entire length of used 1.75 mm plastic for grinding out spots from the servos fighting each other if they are out of sync one of the 3 will rip a spot. And then it is amazing the place will end up in the drive and give a jam error code for blockage. I had to power off over 2 minutes if the firmware dropped the servo or missed one in a command set causing the conflict to get the servo control to return. I dislike that there is no firmware reinstall or revert to an earlier version if unstable or corruption is expected through the PC. Through the thumb drive it recognized any firmware new or old as an upgrade and wanted to replace it.
Thank you for replying and for your troubleshooting suggestions and ideas.
I removed the extruder half along with the gears so I have clear sight of the motor gear itself. By using a thin piece of plastic, I’m blocking the optical sensor to simulate filament presence.
Then I heat up the hotend to temperature (say 200c) and hit extrude from the touch screen while I’m watching the extruder motor gear not rotating at all.
I don’t know if there’s something in klipper config that could potentially prevent it from sending any movement commands to the extruder and I don’t want to “mess” or “experiment” with it without creality’s blessings 
So, new ideas/suggestions are more than welcomed
Have you resolved the issue? My extruder motor is no longer functioning after the filament got stuck. I was getting FO2837 error. I cleaned it and the calibration passed all tests, but there is still no movement in the extruder motor.
Creality is sending me replacement parts. Most probably the motor is burnt.
I will post here once I install the parts and see the results
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Thanks! for the info. Have mailed creality.
Ordered a new motor from alie express. Dont hope its the board. Probably the motor is here before i have done what creality going to say. That i probable already have done . maybe the motor is here from China to the Netherlands before the even reply back.
Did you ever replace your extruder housing.
I have 3 motors spare. I bought them from Creality and one is a direct replacement from Creality.
I would love to blame myself for the dead motor but O can’t. I was extra cautious when my extruder housing went to bits. I made sure the extruder cooling fan was not compromised by the filament sensor wire.
But if you don’t run the filament wire over the top of the extruder motor from right to left it will jam the fan.
My motor has clear resistance compared to a new one.
Not the one from the K2. But it’s described on the wiki. And I think you’d immediately notice the motor cable blocking the extruder fan during testing. Testing doesn’t mean starting to print immediately. This was the first time a piece of PLA got stuck (after 200 prints). I tried a retry once and then followed the steps to remove it. I still can’t believe that the motor got damaged because of this (that’s why I ordered a new one to test it). I’m not going to wait three weeks for Creality for 26 euros. If you have a 3D printer, at some point you inevitably have to replace parts that move or get hot. Creality knows this in their designs too. Once I get a new motor and a response from Creality, I’ll replace the motor and test the one I remove to see if it’s really broken. Probably, I’ll have to take photos, videos, etc., to prove it’s truly broken. But it could also be the board controlling the motor that’s damaged.
I ordered 3 to see what got here first. It was ultimately Creality website won because what’s app too a week just to ship and I paid $40 for expedited shipping. Aliexpress is still at port waiting for clearance for a month now.
For me the delay was a win for me because I bought an extended warranty for the printer who have had to pay me the whole price of the printer. Because no tech could be sent to my house.
creality eu store dont even got parts for the k2. only some sheets and nozzle’s. us sstore dont send to europe.
The symptom for me is that I get about 30-40 layers into a print and it just stops extruding with no clicks or other noticeable complaints, so I think the motor is overheating.
Next time it stops check the filament reel. Check if the filament is jammed between the filament wind and the reel side. I have discovered this a number of times. It jams and is enough to stop being extruded then the K2 fails to register no feed / motor stopped and continues to pretend print.
Yeah, I got a new reel out of the vacuum bag and tried it as part of my diagnosis. I tried other colors. I tried not using the CFS. Replaced the PTFE tubes. Replaced the nozzle. Etc. etc.