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My central AC is a York Diamond 80 (also my furnace). Thermostat set on Cool, isn't cooling. and when i shut thermostat off, it continues to blow air. red light flashing inside unit code = Limit switch open

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Hi,
One of the limit switch in the furnace is tripped or went bad....
Try to find all of the reset switches and push the little red button on the top to reset them...
If that don't work you will need to take an electric meter and test each switch to see which one is bad...

heatman101

Posted on Aug 23, 2010

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