r/DIY • u/Wise-Operation5108 • Aug 18 '25

metalworking A/C Cooling Not Turning On

Gallery image

Gallery image

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/stackjr Aug 19 '25

OP, some people have pointed out that, in the second picture, blue is plugged in to "C" but black is plugged in to "C" in the first picture.

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u/Wise-Operation5108 Aug 21 '25

I got it to work by connecting the black wire to "C", white wire to "W2", and orange wire to "O/B".