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Nest Gen 3 Wiring

LonerWolf
Community Member

Having issues with cooling staying on. 
Here is my old thermostat wiring. 

Red wire RH jumped to RC

Green wire to G

Yellow to Y Jumped to W

White to O

Blue wire (common) is unused. 

I wired the Gen 3 nest  the same way as above with no jumpers. Cooling mode initially worked for awhile but then it stops and doesn’t come back on, just the fan with no cool air.  I assume that it’s because the C is not being used. The unit is a

 Goodman GSZB404810AA. Do I need to open it up and connect the blue wire to the C terminal perhaps?  Then connect it to the C terminal on the nest?

Thanks for any advice. 

 

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