My brother's heat was out. I went over to check it out. He said there was a reshaped coat hangar tied between the gas line and the power feed pipe infront of the furnace door. When he removed it, there was a spark. When he heard the spark, the furnace immediately changed operation. Later we found the 3A fuse on the electronic board inside the furnace was popped. The best we can conclude is the spark blew the furnace. But what is odd is that I can't see static electricity blowing a 3A@24V fuse. The fuse does have 32V limit but still. Also I checked and the gas pipe and wiring pipe are both grounded and at the same potential. We ended up putting a 10A fuse in there since who can find a stupid 3A fuse!?! I think they do that 8hit just to get you to pay $5 for a stupid fuse. a 3A trace can't be that much cheaper than a 5 or
10A trace...2nd problem was that while we were working, his daughter started taking a shower. That turned on the hot water heater. Then we saw the power exhause fan start turning slowly in opposite direction of the arrow on the wheel. Is that wheel supposed to go in direction of the arrow? We never checked its operational direction so I thought I would ask here. Either the heat was going up the chemney creating a draft and sucking air through the furnace as well, or the exhaust was coming down the chimney and back into the furnace. Not sure which.