Leak in manifold - from actuator's pin

[BenH]

Hi, we moved into a house with a 3 years old underfloor system. I notice a small leak coming from the pin (sitting in manifold under actuator). I think the leak stops once the actuator is removed and taken off the pin. I suppose I will need a new pin unit but as a similar leak seem to be happening already with more than 1 pin I’m thinking maybe this is not simply a faulty 3-years old pin but possibly the failure is due to some rust particles in the water affecting the pins o-rings? Changing leaky pins alone should be quite easy but not sure if I need get into an expensive system flush to get everything super clean...? How sensitive are those pins normally? (yes, its a uponor tm manifold)

 

[Chalked]

Contact Uponor.
They will replace the parts. Not the labour tho.
Are the flow restrictors still clear ( see through)

 

[BenH]

Are the flow restrictors still clear ( see through)

No, flow restrictors are quite dirty in places. Few are like dark chocolate in colour (but not all of them). Tested for inhibitor level with a test-kit and result shows its too low, so topping up is a must. Not sure if adding a Magnaclean in the system will be enough to bring floating particles to a reasonable level or that a powerflush is needed? Upstairs rads are nice and warm (even hot) with no cold spots at all, they heat up pretty quickly as well, i'd say within 5-10 minutes they go from cold to almost hot to touch. Any leaky actuator pin will be replaced but the question is knowing if a powerflush is really needed now? The guy from Uponor told me a powerflush will never clear it completely in his opinion but recommended I do it anyway. Just trying to avoid it if I can. The system is 3 years old ... Thanks for any advice.

 

[BenH]

If that help I can try to add image of the inside of the pump taken off this system about 2 weeks ago. BTW what is that mangled piece of rubbery stuff in the middle of the pump?
Is this indicative of the need to powerflush or not??

 

[oz-plumber]

That rubbery piece should be removed, it could be reducing the pumps performance by half.
Not sure what it is, not how it got into your system

 

[BenH]

Thanks. Initially I thought its a part of the pump but then realised it must have been sucked into it. I was told the pump is too weak (no wonder with this thing stuck) so fitted a new one without even looking. oh well I have a spare pump now.