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If you haven't fixed it already, it could be reversed polarity. This happens a lot. People plug in their pigtail upside down if no ground. By the way don't clean your flame sensor with a knife they...

There is a website called advancedairtucson.com. They specialize in heating and cooling. They have a section called, "Ask the technician." They can answer your questions. You don't even have to sign...

Try checking your plug. Can it be upside down? That is commonly caused by reversed polarity. If it's a new install they could have wired it backward. The other issue could be that one burner may not...