Oil Boiler w/ hot water but no baseboard heat (pics attached)

[KpR]

Hi there,
Hoping someone can provide some advice.
We have a Weil Mclain p-468-w boiler with one zone.
Right now, we have hot water in sinks, shower etc. but no baseboard heat.

When the thermostat is turned on, the boiler kicks on. The outflow pipe gets hot up until the flo control valve where the outflow splits into two separate baseboard lines. After this control valve, there is no heat in the pipes. (see picture)
The return pipe is also hot on the boiler side of the circulator pump, and there is some warmth in the return pipe just above the circulator pump but not too far up.
We've had some issues with air in the system in the past and the bleeder valves are attached to the baseboards (9 bleeders in total).
Just wondering what you think: an air bound circulator pump, bad flo control valve, something else entirely?

Any help will be much appreciated.

Thanks,
Kevin

 

[Fitter30]

Taco pump isn't running in front of the boiler. Tridiacator gauge looks like water temp 180* 10-12 lbs water pressure

 

[Sponsor]

 

[KpR]

Purged the whole system of air and we're up and running again. Thank goodness for the woodstove during this little coldsnap.