A fire caused by a furnace malfunction destroyed a mobile home in the park off Egypt Road in Damariscotta on Sunday morning. Homeowner John Sprague and his dog, Lily, had left home around 8 a.m., Sprague said. His daughter called him to tell him his trailer was on fire. “We got here very quickly, but these mobile homes go fast, with all the wood paneling inside,” Damariscotta Deputy Fire Chief Jim Hall said.