HMS 0300-A100-0001-0001: chamber temperature too high
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The chamber is hotter than the machine allows. Open the top cover and the front door now. Then work out why heat had nowhere to go, because the fix is ventilation rather than waiting.
Affected machines: A2L, H2, P2S. This is a protective limit rather than a component failure, and the immediate action is the same regardless of cause.
Where to buy
ANYCUBIC Mini Purifier 3D Printer Accessories, Lightweight Ultra Quiet Purifier with High Density Activated Carbon Filter for LCD DLP 3D Printers (Pack of 2)
ELEGOO 2PCS Mini Air Purifier with Activated Carbon Filter and Universal Adaptor for LCD/DLP/MSLA Resin 3D Printer
PLA in a hot box is the usual story
An enclosure exists to trap the heat the bed produces, which is what ABS and ASA need. PLA needs the opposite. Printing PLA with the covers closed, especially with a high bed temperature in a warm room, accumulates heat through a long print until the limit trips.
The symptom before the code is worth recognising: PLA parts that get progressively worse as the print goes up, soft overhangs, and a hotend that starts jamming after several hours. That is chamber heat rising, and the code is the last stage of it.
Code appears part-way through a long print, often on PLA with the enclosure closed
Bed heat trapped in a closed chamber, warm ambient room, or blocked ventilation
- Open the top cover and the front door immediately and let the chamber drop.
- Check whether the print is PLA. If so, run it with the covers open as standard rather than as a workaround.
- Lower the bed temperature to the minimum the material needs; the bed is the largest heat source in the machine.
- Move the printer away from direct sun, radiators and other heat sources, and check the room temperature itself.
- If the machine has an exhaust or filtration unit, confirm it is running and that its inlet and outlet are not blocked.
- For a machine that prints long jobs in a warm room, fit extraction so heat leaves continuously rather than accumulating.
Do not defeat the limit. It exists because sustained chamber heat degrades the electronics and softens printed parts inside the machine itself, including some of its own components on certain models.
Our page on exhaust and extraction covers moving heat and fumes out of an enclosure, which is the permanent fix when opening the door is not practical. Enclosed printers covers when the enclosure helps and when it hurts, and the troubleshooting index covers the rest.
FAQ
Should I print PLA with the door closed? Generally no. PLA prefers cool air and an enclosure works against it.
Can I disable the limit? Do not. It protects electronics and internal printed parts.
Does a filter unit help with heat? A filtration unit that moves air does. A passive carbon filter does not.
Why part-way through a print? Heat accumulates. Short prints finish before the limit is reached.
LayerWalker
Print defect diagnosis, calibration procedures and parts that actually fit. Corrections welcome through the contact page.
