I have a ef3800 that I basicall put together from 3 other exact stoves. It ran just fine for quite a while.Then the metal blades began scraping making an awful sound. My friend inserted a screwdriver through the exhaust to the blades to alleviate the sound. Since then the stove didn't work. I have fiddled with it it and now the fan comes on and the run light on the motherboard blinks. This happens in the off position. I was in the same spot at the beginning of my repairs last year. I figured it out but I don't remember how. I had extra parts to work with last year that I no longer have at my disposal. Any suggestions?