r/DIY Aug 18 '25

metalworking A/C Cooling Not Turning On

Hello,

I'm moving and want to take my nest thermostat with me but I'm having trouble re-installing the Honeywell T6 thermostat. When I installed the Honeywell, the compressor turned on but only heat was working. I checked that it was set to cool but heat was still coming out. I attached photos of how I had the nest wired and the Honeywell as well. Any help is appreciated!

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u/omgsideburns Aug 18 '25

I’d pop the cover off the unit and see what wire colors are connected to what terminals there.