¶ What it is
Nozzle temperature control mainly includes a heater and an NTC sensor. The TH board will detect the output ratio of the heater and the temperature of the NTC, if the heater has full power output but the temperature does not reach the target value for a period of time, TH will report the heater over temperature.
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Below are the possible reasons that this HMS error occurs:
- The silicone sleeve is broken
- The heater or NTC is not installed properly or is faulty
- The connectors of the heater or NTC are in poor contact
- The TH board is faulty
¶ Safety Warning
IMPORTANT!
- The nozzle temperature is very high; please avoid touching the nozzle.
- It's crucial to switch off the printer and disconnect it from the power source before doing any maintenance work. Otherwise, it could damage the electronics of the printer and cause further damage.
- It is crucial to ensure that the plug is aligned with the slot.
¶ Troubleshooting guide
¶ Step 1
Check if the hotend silicone sleeve is properly installed; the normal silicone sleeve installation is as follows, if it's broken, please refer to this wiki to replace it.
¶ step 2
Please refer to this wiki to disassemble the hotend and check if the heater and NTC sensor are installed properly.
If the heater and NTC are connected properly, but the temperature is abnormal, you can try replacing the heater and NTC(or a whole hot-end assembly).
If the problem is solved after replacing the hot end assembly, you can check the original hot end assembly to see if it is a heater failure or NTC failure.
¶ step 3
If you have a multimeter available, you can try measuring the resistance of the hotend component and follow the steps below to determine if there is a hotend malfunction.
¶ X1 Series Printer
The resistance of the ceramic heater at room temperature is typically around 12Ω, while the resistance of the NTC is around 50-100 KΩ:
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¶ P1 Series Printer
The resistance of the ceramic heater at room temperature is typically around 10Ω (two pins indicated by the red arrows in the image below), while the resistance of the NTC is around 100 KΩ (two pins indicated by the orange arrows ):
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¶ A1 Series Printer
Typically, the error message for A1 series printers is 'Nozzle Temperature Malfunction'. To measure the resistance of the heating component, please remove the rear cover of the toolhead. The plug to be measured is the number 1 plug on the TH board.
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The resistance of the ceramic heater at room temperature is typically around 7Ω (two pins indicated by the red arrows in the image below), while the resistance of the NTC is around 100 KΩ (two pins indicated by the orange arrows , the resistance of NTC varies widely with temperature fluctuations):
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¶ step 4
If the problem persists, replug the 10Pin connector(sometimes it needs to be replugged several times); also check for any signs of burnout on the 10-pin plug. You need to remove the silicone with tweezers before replugging it. Then try again.
X1 series V8 TH board
If your X1 series printer has a V9 TH board, please replug both ends of this FPC.(Because the BTB socket is small, the installation of the FPC is a bit tricky. It is recommended that you only plug and unplug one end at a time and do not press too hard.)
X1 series V9 TH board
Replacing the toolhead TH board assembly （V8）| Bambu Lab Wiki
Replace the toolhead boards (V9) | Bambu Lab Wiki
If your printer model is P1P, please replug both ends of this FPC.
TH board of P1P printer
PCBs on the toolhead of P1P | Bambu Lab Wiki
¶ step 5
If you cannot solve the problem by the above steps, it is likely that the TH board is faulty, so please contact the after-sales team for replacement.
¶ Error message
HMS_0300-0200-0001-0003: The nozzle temperature is abnormal, the heater is over temperature.
"The nozzle temperature is abnormal, the heater is over temperature."
0300-0200-0001-0003
¶ End Notes
We hope the detailed guide provided has been helpful and informative.
To ensure a safe and effective execution, if you have any concerns or questions about the process described in this article, we recommend submitting a Technical ticket regarding your issue. Please include a picture or video illustrating the problem, as well as any additional information related to your inquiry.