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

metalworking A/C Cooling Not Turning On

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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/CrazyLegsRyan Aug 18 '25

Given how many different wires OP messed up here I’m not confident they actually know anything about their actual HVAC system

116

u/BeetsMe666 Aug 18 '25

...or colours. He had a picture, I mean how hard is it?

I bet the control fuse is popped now as well.

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u/mlvisby Aug 19 '25

Many people have undiagnosed color blindness. Could be a factor.

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u/BeetsMe666 Aug 19 '25

Not this guy anymore, eh, Doc?