Hello It seems that because the blades are not in a sealed plenum like other stoves these blowers last longer. However changing them is not as easy as removing a few nuts or screws like other stoves. I manually brushed the set screw with a small wire brush and sprayed PB blaster on it and left it overnight. Saw this post https://www.hearth.com/talk/threads/harman-p61a-combustion-blower-fan-blade-cleaning-or-removal-tips.66633/ Have not tried a torch yet. The allen wrench still will not budge. When this happened on other stoves, I just cut the shaft off. However in this case, the set screw must come out to get the blower out. Because of that, I cannot get a hacksaw on the shaft. Is there any way to get a tool in there behind the blades to just cut the shaft off? See pics below. Luckily it is not noisy like this one!