Radiant Floor Not Heating

I am doing my annual heat maintenance. Upon arrival, I am told that one radiant heating zone not working. The heating system type is hydronic radiant heat. Radiant heat warms the floor. Therefore heat naturally rises. Providing comfortable even heat. I get to the radiant manifold and notice the water not moving through the zone. Also, the circulator pump for the radiant heat doesn't sound good.

Видео Radiant Floor Not Heating канала The HVAC Hacker