Fanuc alarm SV0443: INVERTER COOLING FAN FAILURE (PS SIDE)
0i-D servo alarm (cooling) · Fanuc 0i-D
What it means
Internal cooling fan of power supply/converter stopped (SV0444 = SVM fan)
Likely causes
- fan bearing worn out (top field failure)
- fan connector unplugged
- fan driver circuit on amp
Triage note: Cheapest fix in this dataset - fans are consumables; spin-test by hand and swap fan before considering the amplifier bad
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A290-0703-X277
Amplifier Internal Cooling Fan · Primary suspect
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A06B-6210-H006
Power Supply Module (if fan driver dead) · Check if others ruled out
Need the part urgently?
Send us alarm SV0443 with your machine details — typical RFQ turnaround is 24–48h.