Lock Switch - Part obsolete, USE 12-2391-01

If you’re sourcing the correct replacement, match part B1117390000 to the lock switch part obsolete use 12 2391 01. Keeping the removed part for comparison until testing is complete can help avoid installation surprises. The naming indicates a supersession; use 12-2391-01 when that replacement is specified for your unit. As a other, this part is used to restore general replacement support in a repair scenario. Service calls involving this part type often mention repeat callback, intermittent operation, and fitment issue. Once the failure is confirmed, replacing the part helps correct the specific fault path and stabilize operation. If the issue is intermittent, look for heat marks, vibration wear, loose connections, or binding movement that changes under load. For general parts, verify fitment and test the associated function so the replacement targets the true root cause. Once the failed part is confirmed and replaced, cycle behavior should normalize and performance should return to expected operation. Recheck fasteners and connectors after the first cycle to confirm everything remains tight under vibration and normal operation. Recheck fasteners and connectors after the first cycle to confirm everything remains tight under vibration and normal operation. Once the failed part is confirmed and replaced, cycle behavior should normalize and performance should return to expected operation. If multiple symptoms overlap, complete the diagnosis before ordering so the replacement targets the true root cause. Inspect surrounding wiring, tubing, and mounting points so the new part is not exposed to the same stress that damaged the old one. After a successful repair, technicians often note the symptom and test result to make future troubleshooting easier. Cleaning the area around the repair helps improve fitment and makes leak or vibration checks more reliable. If multiple symptoms overlap, complete the diagnosis before ordering so the replacement targets the true root cause.