Fanuc alarm A1, A2: Program ROM error during control execution
αi SPM · Fanuc αi SPM
What it means
Related to code A: on the αi SPM the control program was already running when an error was detected (A1/A2 variants). When it occurs with the motor active, noise on grounding/sensor wiring is a leading cause; at power-on it indicates wrong software specification or a defective board.
Likely causes
- Poor cabinet/signal grounding; sensor cable bundled with motor power leads
- Wrong software specification for the amplifier
- Defective SPM control printed-circuit board
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6112-Hxxx (SPM or control PCB)
amplifier · Common cause
Need the part urgently?
Send us alarm A1, A2 with your machine details — typical RFQ turnaround is 24–48h.