When installing a new washer and dryer in the basement, i had turned off the inlet to the water heater, which prevented outflow. The heater is also in the basement.
I then accidentally opened the water in the sink on the second floor, cauesing what appeared the water to flow back downstairs where it exited the pipes near the washer.
After everything was hooked up, i turned the water inlet to the heater back on. Hot water flowed everywhere, except the sink on the second floor. Even the bath tub, which as far as I can tell is on the same water lines as the sink, has hot water. But not the sink.
Edit: the sink has a slow trickle when turned on. It stops when turned off.
Does anyone know what might be going on?