HMS 0300-9100-0001-0001: Chamber Heater Short Circuit
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HMS 0300-9100-0001-0001 means the temperature of chamber heater 1 is abnormal and the heater may have a short circuit. That is a mains-voltage heating element, so this is the code in the family to treat with the most respect.
A shorted element draws current it should not and heats where it should not. The machine disabling it is the correct response, and so is unplugging before you investigate.
Where to buy
Measure what the element actually draws
A clamp meter around the heater feed tells you the current without breaking into the circuit. A reading well above the rated figure is the short the message is describing, and a reading of zero is an open element instead.
Test the insulation, not just the resistance
An insulation tester applies a few hundred volts between the element and earth, which is the only way to find a short that only appears when the heater is hot and energised. An ordinary meter at nine volts will tell you the element is fine right up until it is not.
Replace wiring with something rated for the heat
If any of the heater wiring has hardened or cracked, high-temperature silicone wire is the correct replacement. Ordinary PVC hook-up wire goes stiff next to a heater and cracks into the fault you just cleared.
Then stop and judge honestly
If the element measures short, it is a replacement part fitted by someone competent with mains wiring. Diagnosing it yourself is sensible; improvising a repair on it is not.
How HMS 0300-9100-0001-0001 differs from a control fault
A heater that works but never stops is HMS 0300-9100-0001-000C. A short is the element; running at full load is the control loop or the sensor feeding it.
When the sensor is the one at fault
A shorted chamber sensor reports HMS 0300-9300-0001-0003. Why a heated chamber exists at all is covered in printer enclosures and ASA versus ABS.
HMS 0300-9100-0001-0001 FAQ
Can I keep printing without the chamber heater?
PLA and PETG, yes. ABS and ASA will warp.
Is it safe to leave the machine plugged in?
Unplug it until you know. That is the whole point of the code.
Will a multimeter find it?
Sometimes. An insulation tester finds the ones a meter misses.
Could it be the wiring rather than the element?
Yes, and that is the cheaper outcome. Inspect it first.
Measuring beats guessing on the toolhead as well. HMS 07FE-8000-0001-0005 means the extruder switching limit angle has drifted, so the end of travel is no longer where the machine learned it was.
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