Alpha cb24 boiler leaking

[Outlaw79]

I repressurised the boiler today by opening both valve taps and when it was done turned the valves off. But now it's started leaking from two separate points. What have I done and how do I fix??? Cheers.

[The Builder]

What pressure did you run it up to?

[Outlaw79]

About 1.25, just inside the green triangle.

[The Builder]

Ok, that should be alright. Maybe the pressure relief valve is weeping.......
Al BoilerBags is around ............. he'll have a good idea of the problem.......
Hang around :o)

[Outlaw79]

It's leaking from the hot water outlet pipe and where the filling loop valve meets the cold mains inlet.

[AlBags]

It should not leak anywhere up past 3 bar.
You will have to explain where exactly it is leaking from ..!
You have a filling mains loop somewhere on the rising main supply to the boiler?


I have a CB24/28 manual to look at.

[AlBags]

Filling loop to mains leak ... I expect you twisted slightly filling it. It's a compression joint .. right? Turn off house mains and re-tighten it (slacken and retighten)

'Hot water outlet pipe' .. ....

[AlBags]

Yes .. TB ... Just happen to be here .. as just ordering range oven parts from Partmaster!

[Outlaw79]

It's dripping from the hot water outlet pipe actually onto the loop filling valve and then where the valve meets the cold inlet pipe

[Outlaw79]

They're not left hand threads are they?? On the hot pipe it's leaking out of a joint to.

[AlBags]

So that's a connection leaking?
Compression fitting or at a component?

Problem is .. I think you can (as usual) stick the filling loop in where you like .. so you cannot look in manual to locate it)
There are some on/off valves incorporated in mains in, heating flow, return and gas.
Is the fill loop fitted before the mains inlet valve?

[AlBags]

No LH threads anywhere.
Fill loop connectors are a bit like isolating ball-valves. Metal body, olive and steel nut. They can leak and need a re-tighten if disturbed : )

[AlBags]

Over-pressure to 2 1/2bar on the gauge to test .. then either bleed radiators or dump off excess pressure with the relief valve (usually rotates) to 1bar max cold (or 1.2-1.4 hot)

[Outlaw79]

I'll try thanks