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You have a bad high limit switch, or the furnace is overheated. The high limit switch is in place to make sure the furnace doesn't heat up to the point that it damages itself, or anything around it. If the furnace gets too hot, the limit switch opens. When the switch opens the burners turn off, but the blower continues to run in an attempt to clear the heat. ...


From the Owner's manual. Hardwiring Requirements (24V and 230V Operation) For 24V models: Connect black and white wires to a dedicated 40Va transformer. (Not Provided.) Notice that it says "to a dedicated 40Va transformer". This means that you'll have to install a 40VA transformer to power the device, not use the transformer in the HVAC unit. ...

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