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Last several years BOTH heat and cool worked! Cooling does not work anymore

Community Member




We have Lennox model C33-30A-2F-6 



GeneralAire humidity controler 

(Hasn't worked for years)

20171205_184357.jpgHoneywell thermostat wall unit wiring (from 2017 picture)

  • Yellow = Y
  • Red = RC
  • Jumper cable = R/RC
  • Green = G
  • White = W
  • BLUE WIRE = Taped & NOT connected 



Nest thermostat e - 1st gen

  • Y1 = Yellow 
  • G = Green 
  • R = Red
  • W1 = White 
  • C = empty
  • O/B = empty
  • "EXTRA" Blue wire NOT connected 

Both HEAT and AIR worked until Last summer. Now only heat works. 

Please help

Do I need the Nest Power Connector ? 




Platinum Product Expert
Platinum Product Expert

You do not need a Nest Power Connector. At your air handler, take the blue wire that is wrapped around the brown thermostat cable and connect to the C terminal. Then Attach the blue wire at your thermostat to the C terminal. 

The lower transformer, the one with the Red and the White wire attached, is most likely your power for your GENERALAir. This transformer might need to be replaced. 

To test your cooling, with the power turned off to your air handler, place a wire jumper from the R terminal to Y terminal. Turn the power on, and your AC should be running.  If the outdoor unit does not turn on, you have a system failure and you need a call an HVAC service company. 

AC Cooling Wizard


NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
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Community Specialist
Community Specialist

Hi Mrmessymax, 


Thanks for reaching out to us. I hope you've already gotten the answer you're looking for from the troubleshooting steps that CoolingWizard has shared. Please let us know if you still have questions or concerns, as we'll be willing to assist you further.


I appreciate your help, @CoolingWizard




Community Specialist
Community Specialist

Hi folks,


@Mrmessymax, I wanted to check and see if you managed to see the information has been shared. Please let me know if you have any questions from here. I would be happy to assist and make sure you are good to go.




Community Specialist
Community Specialist

Hi there, 


We haven't heard from you in a while, so we'll be locking this thread if there is no update within 24 hours. If you run into any more issues in the future, please feel free to create a new thread.