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I have a 15 year old York 80 diamnond unit and i have four flashes which tells me to open up limit? how do i do that? thanks.

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A limit switch opens when the heat exchanger gets too hot. To check the switch with a meter turn the power to the furnace off, then disconnect the wires from the switch and set a meter to resistance, if the switch is open the meter will indicate infinite resisitance. There are several reasons why a limit switch opens and some of those reasons are
1) dirty air filter
2) the gas pressure on the gas valve is set too high
3) a problem with the blower motor

Posted on Jan 03, 2011

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Check the filters first, then check for blockage in the return or supplies. An easy way to do this is by putting your hand in front of the vents to make sure accurate airflow is there. Your furnace has limit switches on it that detect heat, and if heat is getting trapped inside the unit to much, you will trip these switches and the blower will just run forever. Then you have to reset it or wait forever. But try those few things first. Hope this helps.

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You have a limit switch that needs to be reset. It is probably the roll out switch that is located on the burner housing. The limit switch is a disk about the size of a dime or penny and has two wires to it. There is a small button in the middle of these two wires. Press this button firmly to reset it. Look for all the limits that may be on the unit that is manual reset like the one described above and do the same. This should correct your problem.

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