Just got through dealing with this code on a C452..This MFP had the no stop firmare installed, everything running pretty good, fuser 1 1/2 times its life..pressure apply gears in the fuser broke...this caused the cam driver gear to break, stripped out the worm gear driven by M29, cracked the AC relay harness on the frame side of the MFP..about 5 hours of labor to diagnose and repair...fun, fun, fun . Emujo