I have an England 55-CB120 that I've had for 5 years and it's worked great. 2 years ago replaced igniter and temp sensor. Last year replaced door gasket and glass gasket. This year it works great, but when running in manual mode and set above 4 or 5 it runs for a matter of minutes before giving me an "OT" code. I've the entire exhaust vent. Disassembled the exhaust blower and cleaned it squeaky clean with new gaskets, but still problem remains. The exhaust goes 18" straight out the back of the stove and through the wall before 90° and up 10 feet or so.