Haas Alarm: 951 (M) APC-ILLEGAL SWITCH CONDITION, PALLET CLAMP – The pallet changer clamp switches indicate that the pallet changer is clamped and unclamped at the same time. Check the adjustment of the pallet clamp switches and for debris on the switches. Check switch electrical connections and wiring. After correcting the cause, press Tool Changer Restore to enter pallet changer recovery, recover the pallet changer, and then continue operation.