Worcester cdi 34 return manifold leak - advice

[Some Gump]

Hi Forum,

I have a leak on my boiler - slow weep from return manifold.



Looks like copper pipe into a daily push fit looking thing with a simple spring clip to retain.

So my question - does anyone know if this should be a fairly straightforward fix? Am tempted to give it a blast assuming it’s a) not silly and b) no where near the gassy bits (looks very much not)..

Any advice from the forum?

Thanks!

[RotorRambler]

I’d shield that lower sensor well from water.. then :-

1. Power OFF the boiler
2. Let it cool fully
3. Drop system pressure
• Bleed a radiator or use drain point
• Aim for 0 bar on the gauge
4. Remove the spring clip
5. Pull pipe straight out
6. Inspect:
• Pipe end smooth and clean?
• O-ring inside fitting intact?
7. If O-ring looks tired → replace it (cheap, common fix)
8. Lightly silicone grease the pipe
9. Push pipe fully home (you’ll feel it seat)
10. Refit clip fully
11. Re-pressurise system (≈1.2–1.5 bar)
12. Run boiler and check for leaks

[Some Gump]

Thank you very much RR, that's exactly what I was hoping to hear! 3 quid for a pack of 10 of those O rings, vs min. 150 quid to get a bloke to even look at it - and if it's just an oring (likely), that would gall a little