I have an Ender 3 V2 which has been reliable. I printed 3 items out over the last 6 days and auto homed the printer each time without issues. I tried to auto home after the most recent print job finished and noticed that the print head was not at its usual height.
Troubleshooting
Disabled the steppers to make sure the Z axis moves freely.
Power OFF, un-plug and plug-in the Z axis stepper, power ON again, the try auto home
Result: Same issue, not auto homing correctly
Under Prepare → Move : Move Z axis Up (increase number)
Result: Moves Up
Under Prepare → Move : Move Z axis Down (decrease number)
Result: No Movement
In this state the Z axis does not move freely, I still need to disable the steppers to achieve this.
Do you have any suggestions or is the Z axis stepper faulty?
Blue LED will be ON if a servo signal is present. Blue LED is faint.
Result: Blue LED is on
M119 ; should return OPEN. If not check that the BLTouch is enabled in the configuration. If enabled then check wiring and check that the correct pin is being used.
Result: Open
M280 P0 S10 ; should deploy the probe and the orange LED will be OFF.
Result: probe acted as it should
M119 ; should return OPEN
Result: Open
M280 P0 S90 ; should stow the probe and the orange LED will be ON
Result: probe acted as it should
M280 P0 S60 ; puts it into the M119 test mode.
The probe should remain stowed and the blue LED should be OFF.
Result: probe acted as it should
M119 ; should return TRIGGERED
Result: probe acted as it should
M280 P0 S160 ; returns it to normal operation
M119 ; should return OPEN.
Result: Triggered
I got exactly the same result. Afterwards, I used OctoPrint to move the Z axis Up 10 and Down 10. This worked fine. Can now auto home and bed level. I’m guessing that this is related to the BLtouch. A power cycle made no difference. Me: scratch head.
I hope this helps someone else. Sorry for the concern.
Thank you for posting your answer - this will hopefully help out anyone with your issue in future.
Glad to hear your issue is confined to the BLTouch, though unfortunately that might mean you need a new one? If you find yourself making hardware changes to your printer frequently, I love Klipper, as you just edit a config file rather than rebuilding and flashing marlin each time.
I hope future prints give you less trouble
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