Leaking boiler - can I fix it?

Get some silicone grease to lube the bits in
Vaseline will work as a substitute if you ant got none, but dont go for a dry insertion

 

Oooeerrrrr matron !!!!

 

Looks like a standard 1/2' fibre washer, carry them in the van Sorry dosnt help you out but avaliable over the counter at all plumbers merchants. Doubt the sheds will stock them.

 

AM, looking at your photo of the new part in #10, it's pretty obvious (he says...) that either WB have changed the 'seal' type on more recent models or else the fibre washer that fell out was put there as a bodge by someone.

My guess is that the fibre washer was put there by a complete cretin who either took the flow switch apart to sort a problem, or else removed the FS to sort a leak there. In the process he/she either lost or damaged or found a damaged O ring and thought "I can fix this with parts from my spares box - look, this fibre washer fits!!"

I'd suggest that the most likely scenario is that one of the O rings supplied with your new part (which you should fit complete since you've gorn this far...*) will fit here and will do the job as designed.

The fibre washer was a red herring. To my knowledge, you will only get a fibre washer making a seal when the fitting involved can be screwed down tight with a nut, and not with a 'push-in-and-clip' type connection like wot this is.

So, chances are you do have the parts needed to sort this. Away ye go, man, and tak it apar' agin...

(Man, it's soooo easy to sort these things from this side of the screen.)


(* Yes, this does mean I've now changed my mind twice. So what... )

 

Are you sure it's from the flow turbine/switch, & not from HW heatchanger & the water is finding it's water to the flow switch?

 

Yes.

The flow switch has been replaced, together with the new O rings and the new clip ... & I still have a leak, (unless you made an error fitting) then I start looking elswhere HW heatexchanger top of my list.
Water can take some very strange routes to get from point A to point B.

 

What a pain, AM

Since you've replaced the whole unit, the fault cannot really be in the plastic body itself, or in the O rings. So that leaves the copper (?) pipe that goes in to the end, I guess?

That's be the item to check for damage. If some person has had this apart before and has fitted a fibre washer where there shouldn't be one, then also good chance they've scored the pipe end perhaps by using pliers to remove the old seal?

What's the new leak like - exactly the same rate as the old?

That flow switch assembly - it sits 'inside' a larger plastic component, doesn't it? And does this drip come out from this larger part? If so, I guess that makes things even more tricky as you won't necessarily be able to see where the water is originating from?

 

New boiler.

A excellent Valliant one...

 

Several of the newer models,can use the Valliant vSmart app to control the heating & water.

https://www.vaillant.co.uk/installers/products/vaillant-vsmart-13184.en_gb.html

 

Valliant easy servicing, & easier to repair than a Bosch, not that that Valliant go wrong that often,never has one break down in 20 plus years of have various models.
My 824 has just had a new HW heat exchanger, it's first since new, in 8 years of use & a new pump,engineer dropped old one removing it.

 

(Pssst - don't mention Intergas. Even fewer parts to go wrong... )