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Mono-flow system

Hey guys, having an issue with a radiator not heating up on second floor, that previously worked fine. I installed new boiler this past summer for customer, purged air and system has been working fine up until recently one second floor bedroom radiator stopped giving out heat. Now first thing I checked was air.

No air just water so I Resisted the urge To keep bleeding. I drained down pressure pulled out radiator and checked for blockage at both ends, no blockage.

So my thought is that there is a foreign object blocking the cone in the monoflow tee

Anyone agree with this or is there something else I should check


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