No Water Flow

johntrhodes81

I have cast iron baseboard with a manifold system using actuators. 1 zone has 2 loops of CI BB. 1 of the loops has no water flow even though that radiator has no air bubbles in it and the valve at the baseboard is open (the CI BB in the house used to be setup on a loop system with diverter tees originally before it was switched to home runs and manifolds.
There are no kinks in the pex-AL-pex. Could the baseboard valve be clogged to point there is no flow even with the valve stem up/open? I tried opening and closing the valve. Also at the manifold, the actuators are open, the flow setter is open and no flow is moving.

I am at a loss. Thanks,

John R.

Big Ed_4

Check to see if the actuator plunger valve is stuck . Remove the power head to check spring loaded valve . Hit it with penetrating oil .

neilc

or try closing / slightly closing valve to working loop

neilc

one circulator or two?

johntrhodes81

The plunger under the powerhead is stuck. I guess time for oil.
Thanks.
The manifold with the issue is on a seperate circulator.
Thanks
John

HomerJSmith

I would not use oil, but would use silicone spray, preferably one with out petroleum distillates or ether. Petroleum distillates can some times weld plastic parts together. I use a Sprayway product that the air conditioning guys use.

hot_rod

They usually stick because they have a build up on the stem. You may need to disassemble and clean, or replace the stem and valve assembly. A cleaner or spray may not get down past the o-rings to where the problem is.
Here is an example of a new one and a gunked up one.