Tonight around 2000 hours Tower 751 Capt. Gibson MFF Burch MFF DAmbrosio and Tech. Bede Engines 720 750 were dispatched for the malfunctioning stove. E-720 and the Tower arrived on the scene of a 2 story townhouse with nothing showing. While crews were investingating insidethe Tower set up and placed the bucket at the chimney. The Tower crew determined that it was a working chimney fire. E-720 E-750 crews removed the wood from the fireplace while the tower crew chained the chimney until the fire was out. All units picked up and returned to service.