I had this very problem the last couple of days. My fire was way back on the grate causing my boiler temp to drop. Which in turn caused the wife to get cold...that's a BAAAD thing! I had to manually move the carpet back and forth until it freed up. It seems to be fine now, the house is warming back up and so is the wife.
on a leisure line you can remove the feed tray where the coal burns from inside the stove. It simply lifts off. There is a gasket under it that may need to be replaced if it gets damaged when removing the tray. Once the tray is out you can tell if something is blocking the coal from the hopper. Be careful, if the hopper is full it will spill coal into the air box and you will have to clean it out. Make sure hopper is as empty as you can get it before removing the tray. Just thought this may be helpful in the future.