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I have a hydro flame furnace (8516). On my last trip the furnace worked the first night; but the second night there was no heat. Back home I discovered that the thermostat (Robertshaw TH100, 24 milivolt, heat only) was burned out on the wire to the adjustable heat anticipator. I replaced the thermostat, but when I turned it on, there was a flash, and it was burned out the same place. I connected the hot wire to the point marked "red" and "common". any help appreciated.