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I am getting 4 blinks on board saying open high limit device.
I am getting 4 blinks on board saying open high limit device. I am getting continuity through the switches and the fuses so they don't seem to be the problem. Hot surface ignitor seems OK and within resistance range. Flame sensor looks OK but I haven't sanded it yet or tried another one. Not sure what else to try. This is a Trane electric ignition furnace 10 years old.
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