I knew my M55 insert had the old style blower. I did nothing. Came home today after working 10 hours to a balmy 62 degree home and a pissed off dog. My stove is blinking #4. No problem, I said. I'll hop on Hearth, find the high limit switch, reset, and call the dealer on Monday. Enter horrific noise from stove. Pulled it out to find my convection blower HANGING down and broken. If you own an M55, I beg of you to look at the convection blower. If it is square on the right side, get a warranty replacement. Don't be like me. BTW, my oil boiler is down right now because of...you guessed it....a blower! The biggest positive here is that Preston Trading Post, where I bought the stove, is open until 9pm and is in the process of pulling a blower out of a floor model as we speak. I'm posting this then driving down there. Thank you guys for giving me the knowledge to know the blower is a warranty replacement. My procrastination is on my shoulders...lol.