mixing Fernox leak stop and unknown inhibitor

[george121212]

Hi I have a Worcester Combi boiler 3 years old that is losing some pressure every 6 weeks for the past 12 months.
It is covered by the Worcester warranty so a Worcester engineer came out assessed it and said everything including the valves and expansion tank looks ok.
He said it is most likely a problem with a small leak somewhere in the pipework.

He suggested adding some leak sealer through a towel rad.
When the boiler was installed 3 years ago I am sure he put an inhibitor in at install although I cannot remember the brand.

My question is I have some Fernox leak sealer, is there a risk here mixing it with an unknown inhibitor in the system like sentinel?
There appears to be mixed comments online that this could form a jelly sludge and cause blockages?

thanks

 

[denso13]

The boiler is relatively new, I'd be looking for the leak, not adding sealer.

 

[george121212]

Hi, thanks for the reply , the house has 16 or so rads in it so he advised finding a leak might be hard.
I have had a good look but unfortunately nothing obvious has reared its head.
The boiler has been checked out by a worcester engineer 2 weeks ago and he says is happy that it is not the boiler. still have another 5 years gurantee on it.

Just didn't fancy causing too much damage looking for the leak, would leak sealer be a shout?
thanks

 

[denso13]

would leak sealer be a shout?

It might work, it might not, and could cause more problems than a leak.

It can be difficult to find but be systematic about it. Isolate sections to narrow it down.

 

[george121212]

Good advice thanks, maybe ill have another good look and try and find the leak.
I asked the same engineer about installing a magnafilter, he advised probably no point now being 3 years down the line.
Do you think it would be worth having one installed? thanks

 

[denso13]

I asked the same engineer about installing a magnafilter, he advised probably no point now being 3 years down the line.
Do you think it would be worth having one installed? thanks

Yes, good idea.

 

[Exedon]

As above try finding leak. If it's taking 6 weeks to drop pressure I'd be having a good look at all rad valves .
Take of heads of trv's and dust caps off lockshields.
Auto air valves if you have any can be another source of problems.
Just fit a decent system filter, difficult to understand why a boiler only 3 years old didn't have one fitted as part of install.