Heritage Bay by Lopi Fan not turning off

Turn off stove from manual to off, goes through shutdown process but fan that pushes heat into the room from the front does not turn off.

Usually that means the low limit switch that turns off the convection blower is bad.
You may find one here.
https://www.eastcoasthearth.com/collections/universal-pellet-stove-parts/products/low-limit-snap-discs-diameter-air-stream