HMS 0300-2700-0001-0007: Calibration Sensor Frequency Is Too High
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HMS 0300-2700-0001-0007 means the sensor frequency during nozzle offset calibration is too high and that the sensor may be damaged. It is the mirror image of the low-frequency code on the same part, and it responds to the same short list of checks before replacement.
High readings have one cheap cause worth removing first: conductive debris sitting on or near the sensing face.
Where to buy
Clear the swarf properly
Metal particles from a nozzle change or a cut purge sit happily on a sensor face and read as target. An electric air duster shifts them continuously without the moisture a canned propellant leaves behind, and you can use it as often as the job needs.
Clean the connector contacts
A high-resistance joint distorts a frequency reading as readily as a dirty face does. Electrical contact cleaner, applied to the pins and allowed to flash off, is the standard fix and takes a minute.
Stop the loom resting on the sensor
A cable that has worked loose and now lies across the sensing area changes what it reads. Adhesive-backed cable clips put the loom back on its intended route for a few cents, which is cheaper than the sensor you were about to buy.
Then decide on replacement
Clean face, clean contacts, loom clear, still high: that is a failed part. At that point the toolhead service procedure applies — the modules are set out in the Bambu Lab H2D, and the calibration routines themselves in the OrcaSlicer calibration menu.
How HMS 0300-2700-0001-0007 pairs with the low reading
Too low on the same sensor is HMS 0300-2700-0001-0001. Seeing both over a few days means contamination far more often than it means a part failing in two directions.
Do not confuse it with the extruder sensors
The 2500 and 2600 groups are the extruder-mounted pair; HMS 0300-2500-0001-0007 is the right-hand one and blames the heat sink. This code is the calibration sensor and blames itself.
HMS 0300-2700-0001-0007 FAQ
Why does debris raise the frequency?
Conductive material near the face reads like a target that is closer than it is.
Is canned air acceptable?
It works, but it can leave moisture. An electric duster avoids that.
Can I recalibrate my way out of it?
No. Calibration stores the error rather than removing it.
Is this the same part as the 2600 sensor?
No. 2700 is the nozzle offset calibration sensor.
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