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One of the wires on the roll out switch got burnt, so we taped it together as a temporary fix. It worked for a while then both got burnt and the system shut down.

Could the problem be the roll out switch (I know this has to be replaced anyways), or could the gas control valve be bad and needs to be replaced?

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by burnt, do you mean physically burned, or..? – Steven Apr 2 '13 at 16:35
If you're getting burnt wires, your roll out switch may have failed closed. Contact an HVAC technician to determine if the switch is bad, and\or if there are any other faults in the system. The roll out switch is meant to detect abnormally high temperatures near the burner. If the switch has failed closed and the temperatures are too high, it could lead to damage to the boiler, property damage, injury, or death. – Tester101 Apr 2 '13 at 16:59

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