Hello, I just bought a shelter SF1000 (2017 manufacture date) from menards brand new. I have installed it in my garage and am going to pipe it under neath my modular home to help out with my propane expenses, I have the stove installed, the chimney done perfectly no back draft. The stove heats up and the blower kicks on but only cycles for about 10-15 seconds before kicking back off then it takes another 5 minutes before doing it again. I have a good fire established plenary of heat and coals, is this how these furnaces are designed to work? Any help is greatly appreciated!