SOURCE: I have a Lennox Pulse
Hi,
That can be a bad relay, but it also can be the high limit has tripped...or went bad...when the high limit thinks that the furnace is too hot the blower will run continuously...
The best way to troubleshoot is to unhook a wire from the high limit and see if the blower stops... if it does then the high limit is bad or needs to be reset...
if it continues to run then the relay is likely welded together...
heatman101
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