Circulator Pump working but no heat

I have 2 zones in my home one is steam heat the other was added on as hot water baseboard; the circulator pump was running fine no problem kicked on when the thermostat called for heat; all of a sudden pump still working but no hot water making it to the room, I thought maybe a part in the pump had gone, so I replaced it, the new pump is running great but still no heat. I opened the valve to bleed the system and started it up again and still nothing.

 

Did water come out the loop.? Could be air bound or a frozen line...

 

Can you post pics of how the hot water loop was piped and is this an ongoing problem or something new.

Did you feel the pipe to see if there is any temp and where it stops.

 

This is a new problem, the walls in the room are insulated and the temp hasn't gotten bellow 55 in the room, also I have a wood stove that warms up the room. I did feel where the hot water stops, it is in basement only 4 or so feet from the pump. I can't take photos right now but it is a basic copper pipe that runs up into the room.

 

As lawrosa mentioned it could be airbound or frozen pipes. The room being at 55 unless you have a pipe in direct contact with an outside draft would eliminate a frozen pipe.

I suspect you are airbound. You mentioned the pipes run up into the room.

Dpending how it's pipe and the fittings used and if your steam system surges dropping the water line below the tappings for the hot water loop allowing the water to syphon back into the boiler from the loop creating a potential air situation.

You should have flochecks installed to prevent this but without pics there is no way of telling how it's piped. How close to the water line are the tappings for the loop.

How did you bleed the loop after the pump replacement.

Just a thought.