¶ Issue Description
The screen displays the following error: 0003-0528-0003-0004.
This error code is triggered by the following logic: if the Z axis has already risen far enough but the homing sensor is still not triggered, this error code is output.
How the homing sensor is triggered: the nozzle makes contact with the heated bed.
Therefore, the cause generally falls into two categories:
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The Z axis movement is obstructed and does not rise far enough, so the heated bed fails to contact the nozzle.
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The homing sensor is not working properly.
¶ Troubleshooting Steps
When this error occurs, troubleshoot according to the current position of the heated bed.
¶ 1. Heated Bed at the Lower Limit
This typically presents as the heated bed being completely unable to rise, accompanied by noticeable abnormal noise. The most common cause is that the heated bed shipping screws have not been removed.
Solution: Use an H2.0 hex key to remove the heated bed shipping screws. If the screws have already been removed, please check for movement interference.
If a screw spins freely without coming out, refer to Heated Bed Screw Spinning and Cannot Be Removed.
¶ 2. Heated Bed at an Intermediate Position
Do you also hear abnormal noise? Yes ｜ No
¶ Check for Movement Interference
(1) With the machine powered off, pull the timing belt at the bottom of the machine clockwise to raise the heated bed, and check whether there is significant resistance when raising it manually.
(2) If there is, check whether the linear rod / lead screw has come out of place. Refer to the Lead Screw / Linear Rod Misalignment Recovery Tutorial to restore it.
¶ Determine the Error Frequency
(1) If there is no abnormal noise and the error occurs infrequently with no particular pattern, it may be a firmware bug. We recommend updating the firmware to the latest version.
(2) If there is no abnormal noise but the error occurs frequently, we recommend exporting the log immediately and contacting technical support.
¶ 3. Heated Bed Close to the Nozzle
¶ Clean the Nozzle
Identify which toolhead the machine was using when the error occurred, heat the nozzle to 200°C, and clean the nozzle with a wire brush. If the issue persists, proceed with the following troubleshooting steps.
¶ Check the Hot End Installation
For the homing sensor to work properly, a certain gap must be left between the hotend and the bottom of the extruder. Reference standard: 0.1-0.4 mm.
How to check whether it meets the standard?
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A common sheet of A4 printer paper (approximately 0.1 mm thick) should fit into the gap.
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The same sheet of A4 paper, folded in half twice (approximately 0.4 mm thick), should not fit into the gap.
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Determine whether the gap is too large or too small, then tighten or loosen the hotend screws accordingly. If the issue persists, proceed with the following troubleshooting steps.
¶ Check for Vibration Interference
The homing sensor is relatively sensitive to vibration. In this step, try removing or adding a vibration source and then home the axes manually.
Determine the specific cause based on whether the error disappears after removing a vibration source, or appears after adding one.
Vibration Source 1: Other machines on the same table
Remove the vibration source:
Move the machine onto a level floor and home the axes manually.
Note: Do not place anything underneath the machine!
Vibration Source 2: Part cooling fan
Add a vibration source:
- Pick up any toolhead, for example Toolhead 2.
- Set the part cooling fan (main cooling fan) to maximum speed and home the axes manually.
Vibration Source 3: Hot end cooling fan
Add a vibration source:
- Identify which toolhead the machine was using when the error occurred, and unload the filament from that toolhead, for example Toolhead 2.
- Keep the toolhead picked up, heat the nozzle to 140°C to turn on the hotend cooling fan.
- Home the axes manually.
¶ Endnote
If your issue remains unresolved, please contact technical support, our dedicated support team will be more than willing to assist you in resolving the issue.
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