Congratulation to your success! I had the same problem as yours. However, you didn't mention how you wire two a/c control wires to your furance board: white wire to C and Red wire to Y? As you mention that there is no voltage between C and Y. How did you wire them? Your information is highly appreciated.So I did what you said first, jumped the GH to the R put the power back and turned it on and nothin...BUT then after about 90 seconds and the snowflake started flashing!!! and then the condenser came on and it is all fixed and heat & A/C both work perfect! Still no power between y and c but now there is power between c and gh, when calling for the cooling.
Thank you again, Beenthere. What a great feeling to have that fixed correctly now. Karen