Can't figure this 3 wire system out or find anything in postal about it 3rd gen nest thermostat. opened my sister and this yellow wire isn’t Thermostat wiring hvac wire code colors air color heating electrical control heat pump system conditioner installation cooling highperformancehvac capacitor codes
Thermostat Wiring Colors Code | HVAC Control Wire Details
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Can't figure this 3 wire system out or find anything in postal about it
Thermostat Wiring Colors Code | HVAC Control Wire Details
3rd gen nest thermostat. Opened my sister and this yellow wire isn’t