Fixing a Furnace Gas Valve

Friend's furnace took a dump. While I was trying to find the problem, it un-took it. I couldn't find the problem for the life of me, so I let it work and came back the next day with fresh eyes. The first thing I tried to do was backprobe the gas valve electrical plug - with it running - to see how it was controlled. Immediately, the gas cut off. I had found the problem!

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• #furnace_repair
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