I've been fighting vacuum errors with this St. Croix Revolution furnace for the last two months. I clean it religiously, and pulled the combustion blower about a month ago - not much crap on it, but I cleaned what was there out. It got to the point where I had to sweep out the whole venting system at least once a week to keep it going, never that much came out (maybe enough to fill a beer can) but that would get it back up and going for a few more days. I could hear that the convection blower was getting very noisy, but it's a major teardown to get it out and I was hoping I could make it through to the spring. The furnace died altogether last night - now when I plug it in the power light comes on for maybe a second and immediately dies. So the main fuse isn't blown, but something in there is obviously drawing heavy current. I'm frankly seriously tired of dicking with it, and I have most of the half a tank of oil I bought at the beginning of the season left, so I'm gonna burn expensive dino juice for a couple of weeks and hope it gets me through. My main suspect is the combustion blower, although it seemed to spin freely when I had it out. Hate to think it's the control board.
Question: can I just pull the wire to the hot side of the combustion blower (and after that the convection blower, if that doesn't work) and see if that's what's causing it to not power up at all? Or does the circuitry expect to see a load? I can make up a patch cord to test the blowers separately, but am wondering if this would be an acceptable quick check.
Question: can I just pull the wire to the hot side of the combustion blower (and after that the convection blower, if that doesn't work) and see if that's what's causing it to not power up at all? Or does the circuitry expect to see a load? I can make up a patch cord to test the blowers separately, but am wondering if this would be an acceptable quick check.