041C4398A is a RPM sensor kit is a single 5-bladed photo interrupter sensor. Compatible with various garage door openers made after 1995. Check the manual for your specific model number before ordering to ensure compatibility.

Also known as: 1A4903, 41C3005, K75‑16426, 41B3000, 41C4398A, 41C4398, 41C4398‑1

If your garage door trolley goes down 6 inches and comes back 6 inches then this is your problem

Compatible with Liftmaster and Chamberlain garage door openers 1986 to current.
Compatible with LiftMaster and Chamberlain garage door opener chain drive models 1040, 1045, 1046, 1050, 1055, 1056, 1060, 100WD, 200WD, 300 WD, 1140, 1145, 1146, 1150, 1155, 1156, 1160, 110WD, 210WD, 310WD, 1240, 1245, 1246, 1250, 1255, 1256, 1260, 1260LK, 1245LK, 215WD, 220ED, 315WD, 320WD, 1240R, 1245R, 1246R, 1255R, 1256R, 1265, 985, 2265, 2565, 2245, 2255, 2575, 2595, 140, 150, 240, 350, 450, 550, 700WHC, 701WHC, 1000, 2000, 4000, 4001, 5000, 710WHC, 711WHC, 1100, 2100, 4100, 5100, 7200, 1200, 2200, 4200, 6200, 7220, CG40, PD210, PD610, PD612K, 7420, PD752, PD758S all models may not be listed.
Garage door opener belt drive models 1270, 1280, 1280R, 2280, 2580, 2585, 8100, 8100M, 8200, 9200, WD822K, WD922K, WD912KS, WD822KS all models may not be listed.
Comes with Instructions

LiftMaster Sears Craftsman 041C4398A RPM Sensor Assembly LiftMaster Sears Craftsman 041C4398A RPM Sensor Assembly