Fire chief fan limit switch problems

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If it short cycles in auto then that would mean theres not enough heat. I've seen them break but its usually from years of heating and not to much heat.

Short cycling means it gets hot then the fan cools it down to the point where it shuts off then the it heats back up again and it kicks the blower on until it cools back off. If theres enough heat it wont shut off until the furnace has cooled down. Assuming you know how to burn your furnace correctly then adjust the on off sliders on the fan switch so that it works well.
 
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