What am I doing wrong? AC won’t cool. Labels of cables match old

What Is The Ob Wire On A Thermostat. What am I doing wrong? AC won’t cool. Labels of cables match old While thermostat wire colors can vary, you can also sometimes use color as a guide if a wire is in your thermostat's O/B - W terminal. S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat.

S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat. One is for cool and the other is for heat, hence the abbreviation "RH" and "RC"

What is OB Wire on Thermostat? (Basics, Function, Precautions)

S, S1, S2: These wires run directly outside and provide outdoor temperature information to the thermostat. At the heart of a thermostat's wiring system lies the O/B wire, which serves as a crucial link between the thermostat and the heat pump in HVAC setups The Nest Thermostat E and the Nest Thermostat's star terminal also have an O/B label because it can alternately be used as an O/B connector for heat pump systems

Common Thermostat Wire Colors. What are the 4 wires on a thermostat? 4 Wire Thermostat Wiring (Heat Pumps, HVAC) Red wire for power (24V) The O/B wire is primarily associated with heat pump systems, where it plays a pivotal role in orchestrating the reversal of the refrigerant flow to enable both heating and cooling functions.

Google Nest Thermostat Wiring For Heat Pump. Red - Now, there can be two separate wires for this it appears the brown wire and blue wire both end at the zone controller box, but are not hooked up to anything