Fanuc alarm 03
αi PSM · Fanuc αi PSM
What it means
Temperature of the main circuit heat sink has risen abnormally.
Likely causes
- Main-circuit cooling fan broken
- Dust accumulation in heat sink / filter
- Continuous operation above rating (overload)
- Control printed-circuit board not fully seated (inter-board connector detached)
Triage note: Reseat faceplate/control PCB firmly before condemning the module. Mirrors as SP0058 / 9058.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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Per-module fan kit
Cooling Fan Assembly · Primary suspect
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A06B-6087-H145
Power Supply Module αi PSM (if overheating recurs with good cooling) · Common cause
Need the part urgently?
Send us alarm 03 with your machine details — typical RFQ turnaround is 24–48h.