My old thermostat had a w-o/b wire, and I'm unsure whether to plug it into w or o/b on the nest. We ended up plugging it into the w port.
We don't have a heat pump, we have a forced air gas furnace. The A/C seems to be fine, but when we turn on the heat through the nest the system blows cold air.
Is this a common issue? Any solutions?
Solved my own problem. We had to update the wiring settings to get rid of the o/b (labeled as " * " on the nest settings). Even though our original thermostat said w-o/b, from the nest's perspective there was only the w (for aux. heat). So once we updated the wiring the nest stopped trying to use the non-existent heat pump.
Sure. Our old thermostat said one connection was "w-ob", so when best asked us what our connection labels were we included both. But as we don't have a heat pump, we should have only included the "w". I had to hit an option in the nest app to re-select my wiring (I don't have app in front of me so I'm paraphrasing) and uncheck the "ob". Once I did that the nest was no longer trying to route through the heat pump and was able to function.