HMS 0300-0200-0001-0008: nozzle cannot reach the set temperature
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HMS 0300-0200-0001-0008 means the nozzle is heating but cannot reach the temperature you asked for. That is a different fault from a dead heater, which reads as an open circuit and is reported differently. Here the heater works and something is stealing the heat, or the heater is delivering less power than it should.
Affected machines: A2L and H2C. The printer gives the heater a reasonable time to reach the target and gives up if it does not. That timeout is what you are seeing, and it usually fires at the start of a print rather than during one.
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Heat going out faster than it goes in
Start with the silicone sock. It is there to stop moving air stripping heat off the block, and a printer that has lost one, or has one that has hardened and no longer fits, will heat slowly and plateau below target. This is the single most common cause and it costs nothing to check.
Next, the air itself. An open-frame machine standing in a draught, or an enclosed one running with the door off and a fan pointed at it, loses more heat than the firmware expects. Higher target temperatures make it worse, which is why ABS shows this and PLA does not.
Only then look at the heater. A cartridge that is failing rather than failed reads higher than its rated resistance, delivers less power, and heats exactly like a healthy heater in a draught. The meter is what separates the two.
Nozzle heats slowly and the print aborts before starting, or stalls a few degrees short
Missing or hardened silicone sock, a draught, a poor connection, or a tired heater cartridge
- Power off at the wall and let the hotend cool completely.
- Check the silicone sock is present, intact and seated. Replace it if it has gone hard or torn.
- Look for a draught: an open door, a room fan, or an air conditioning vent pointing at the machine.
- Unplug the heater connector and inspect both halves, then measure across the heater pins and compare with the rated resistance for your model.
- Reseat the connector and retry the heat-up, watching whether the climb is steady or stalls part way.
- If the heater measures high or the climb still stalls in still air, fit a replacement hotend assembly.
Note the temperature it reaches before giving up. Stalling at 240 degC when asked for 260 points at heat loss or a weak heater; stalling at 80 degC points at something much more wrong, and that is worth a support ticket rather than a part.
The dead-heater version is hotend heater open circuit, and the sensor version is hotend temperature sensor fault. Our page on the hotend covers the assembly, and the troubleshooting index covers the rest.
HMS 0300-0200-0001-0008 FAQ
Why does this only happen with ABS?
Higher targets lose heat faster. A machine that just manages PLA temperatures can fall short at ABS temperatures.
Is the silicone sock really that important?
Yes. It is the cheapest part on the hotend and the one whose absence produces exactly this fault.
Can a dirty nozzle cause it?
Not directly. A clog affects extrusion, not the ability to reach temperature.
Should I replace the heater or the whole hotend?
On these machines the hotend is a sealed assembly, so the replacement is the whole unit.
LayerWalker
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