Have HVAC Questions? Ask an HVAC Expert for Answers
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Do you have a picture of what you are seeing that you could upload?
Where did they go to the old board what terminals?
Can you send me a pic of the wiring diagram on the unit I should be able to guide you from that
The Yellow with green go to the 24 VAC RTN and the Blue goes to 24 volt Hot.
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The Yellow with green goes to the RTN and the Blue should go to 24 volt hot
Did it not come with a harness to connect them to the wire harness?
This is very simple.Not sure why previous expert is having such a hard time with this. The new board should have a safety with it. The blue wire will go to that safety. (You can actually leave existing safety if you choose)Your blue transformer wire will go to other side of the safety. Your transformer also has a yellow wire.That will plug into the yellow you are referring to.The green you are referring to will go to the metal casing terminal built in.
Watch the video below.This explained between 12:21 and 15:09
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Watch video at link below