UFH slight weep from the manifold....simple nip up or a heating engineer?

[RJD68]

Hi all.
Got a Polypipe UFH manifold (8 years old) and having turned off the UFH a few weeks ago I decided to turn it back on again as the mornings and evenings are just too cold again. Noticed a slight weep in the flow part of the manifold (see pictures - second one is a close up of the joint) enough to catch a maintain in a small plastic pot....for now!! The area is showing signs of a discharge/scale build up too.
I’m not sure how the manifold is constructed, it looks as if there’s a section of 22mm copper pipe connecting the flow manifold to the CH pump in which case I assume it’s a compression joint? In this case I expect I could nip up the nut and possibly stop the weep but I don’t want to then find I’ve made it worse. The boiler seems to be maintaining its pressure for now but anyone know if nipping up this nut is likely to help or if I should get an engineer in to replace the joint between the manifold and the pump that’s showing evidence of discharge/corrosion/scale. Is this discharge normal for a manifold assembly of this age? Interestingly the manifold return side is completely clean (no discharge/corrosion) and is leak free.
Many thanks.

 

[Chuck]

anyone know if nipping up this nut is likely to help

IME, unlikely. Additional 'nipping up' is only good for newly made joints that haven't been tightened correctly.

That sort of seal is usually made by the threads, which need to be packed/wrapped correctly before assembly, or a fibre washer. You may be lucky, but be prepared to have to dismantle the joint, replace any corroded parts, and reassemble correctly.

 

[SimonG]

That joint is goosed. The seal is via an o ring inside the nut connecting to the valve. Just put one together yesterday. If you undo that nut then on the end is a split washer holding the nut onto the shaft. Poor design.