Nest Thermostat - Not cooling

First warm weather using my nest thermostat and now trying to use the central air. However, only the fan turns on and it doesn't actually cool no matter how long I run it. (It worked perfectly in the winter with this setup)

Looking at the furnace and NEST, the wiring is as follows:

FURNACE  |   NEST
------------------
R     |    RH
W     |    W
Y     |    Y1
G     |    G
C     |    C


On the Nest, the remaining spots that do not have wires are: Y2, OB, RC, W2 aux, and *.

Any help is appreciated. Thank you.

• Is there some reason you aren't telling us what furnace or heat pump the Nest is connected to? We have some experienced HVAC folks around, but they aren't psychic. :) – isherwood May 7 '18 at 19:24
• Wow - well, I am at work right now. Thought I could get someone to help out. Apparently, it's impossible to answer without that part of the equation. My apologies. I have a picture of the wiring from the furnace unit. Not sure if that would kep any. But, let me know. – ETedford May 7 '18 at 19:38
• Not impossible, just better likelihood of correctness. Add it later when you can. – isherwood May 7 '18 at 19:43
• Are you getting any diagnostic blinking-light patterns/codes on the furnace when the thermostat calls for cooling? – CactusCake May 7 '18 at 20:33
• Regarding the individual asking about the make of the furnace....The furnace is a Lennox Pulse21V gas furnace. The a/c unit is Carrier Model 38ESG or 38EZG. (Both listed on the user manual). – ETedford May 7 '18 at 23:53