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Hi I'm Brian and I'm here to help!
Chances are the EIM is ok. It's more likely that the fuse or low voltage transformer on the heating or cooling unit the EIM is powered from is blown. You should check for 24 volt ac power on the transformer in the unit that sends power to the EIM on terminals R and C below the U terminals on the EIM. If no power there then you should look at possibly a control fuse in the air handler or furnace that's being controlled or if no fuse, look at the transformer itself.
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