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Heat Pump without OB wire. How to wire to electronic thermostats? (like Nest) - DoItYourself.com Community Forums
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What am I doing wrong? AC won't cool. Labels of cables match old thermostat. Settings match (heat pump / 2 stage / OB wire on cool). : r/smarthome
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Help with thermostat wiring O/B to O and B or to jump heat to on - DoItYourself.com Community Forums
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