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[Sir Tigger KC]

I've got a small leak coming from an elderly Ferroli combi boiler and I can't see where it's coming from, but I think it's possibly the heat exchanger.  So maybe it's days are numbered. 

Are these leak sealers any good? Do they block the system? I'm thinking it might buy some time..... 

http://www.screwfix.com/p/sentinel-rapid-dose-leak-sealer-400ml/60012

TIA! 

[05omegav6]

Might be ok for the heating side, but if the leak is on the tap side then best not chance it

[Sir Tigger KC]

It's the heating side, as the pressure slowly drops. 

[PhilRich]

If it is the main heat exchanger then a 'leak seal' additive is unlikely to be of any use 
It may be just a joint seal on the exchanger connections or even a loose nut
If it is coming from a compression joint then don't be tempted to just 'give it a nip up', undo the joint completely, clean the mating faces/replace the seal washer or 'O' ring & redo the joint.

[tooleater]

Make sure de pressurise the system first Lol

[Taxi_Driver]

You can probably get replacement gaskets for the heat exchanger....I remember the plumber I used for my boiler swap....mentioned he could still get the gaskets for my old boiler...and that was over 30 years old ...

Or you could try this....twice my old boiler started leaking and both times it fixed the leak....turn the stat on the boiler up to max and let it run for an hour or two 

[Sir Tigger KC]

I had another look at this today and found 2 leaky joints, so hopefully not the heat exchanger! 

Leak 1 was the joint where the DHW pipe comes out of the combustion box.  So I took it apart cleaned it up, gave the washer a good smear of silicone grease and wrapped some PTFE around it all and did it up and jobs a good un! 

Leak 2 is in a joint on the central heating system where it leaves or enters the boiler.  The problem is that it's a 30mm knut and I can't get a spanner, stilsons or anything on it as it's tight up against the casing.    So I'm stumped on that one. 

50% success rate today! 

[4x4]

Can you post a pic up of the under neath of the boiler where the valves are,as they have to accessible to tighten up when installing boiler,and its been a few years since ive touched 1 off these boilers 

[Sir Tigger KC]

It connects into the brass manifold where the pressure relief valve, water temp sensor, and pressure sensor live.  I think I probably have to disconnect the pressure relief outflow pipe to get at it.  I'll have another look tomorrow. 

This is the manifold and it's the knut that screws onto the threaded part at the bottom that is leaking.  The top connection is a push fit with a rubber O ring and spring clip, but I'm reluctant to disturb that without a new O ring and clip to hand.