HMS 0300 0100
Bambu Lab 3D Printer
Severity: CriticalWhat Does This Error Mean?
HMS 0300 0100 means the nozzle temperature reading is abnormal. The thermistor may be disconnected, damaged, or giving incorrect readings. Check the hotend thermistor connection and wiring.
Affected Models
- Bambu Lab X1 Carbon
- Bambu Lab X1
- Bambu Lab P1S
- Bambu Lab P1P
- Bambu Lab A1
Common Causes
- Hotend thermistor disconnected after maintenance
- Thermistor wire damaged during nozzle change
- Thermistor failed internally
- Hotend not seated properly after reassembly
- Firmware detecting inconsistent temperature readings
How to Fix It
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Check the hotend assembly is fully seated.
If you recently changed the nozzle or hotend, make sure it clicked back into place. The electrical connections must be secure.
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Inspect the thermistor wires on the hotend.
Look for pinched, cut, or loose wires near the hotend. The connector should be firmly attached.
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Restart the printer and try again.
Power cycle the printer to clear temporary sensor errors.
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Contact Bambu Lab support if the error persists.
Bambu Lab printers have integrated hotends — individual component replacement may require a new hotend assembly.
Frequently Asked Questions
What does HMS stand for?
HMS stands for Health Management System — Bambu Lab's error reporting framework. Each error has a numeric code that identifies the specific issue.
Can I change the hotend myself?
Yes. Bambu Lab hotends are designed to be user-replaceable. The X1C and P1S use a quick-swap system — no tools needed.