Saunier Duval F24 therma classic

[acko]

Hello to everyone on here.
I hope somebody can shed some light on my problem.
When we bought our house 8 years ago we had a new central heating system fitted.
The combi boiler is a Saunier Duval F24E therma classic which has been very reliable.
Last year the hot water started to flow hot then warm then hot then warm.
A plumber fitted a new 'flow valve' or something which cured the fault for about 3 weeks.
He didn't seem interseted in anything other than trying to get us to buy a new boiler as he said ours was very old and not really worth repairing.
The fault has come back steadily and has been worse than ever for the last 6 weeks.
We have a new baby due in 7 weeks and really need to sort this problem before conatcting another plumber hopefully.
The central heating has always worked fine its just the hot water problem.
When the hot top is open the boiler is always cutting in and out which results in the poor water temperature.
Thanks in advance for those who might be able to help.

 

[fazedup71]

I would suspect the plate to plate heat exch is dirty, no need to get a new boiler

 

[45yearsagasman]

I agree.By the flow valve I am assuming the diverter valve was replaced.I'm a great believer in get the basics checked before diving in with a heap of parts.Plate heat exch and the connecting ports must be checked and cleaned as necessary.

 

[acko]

Thanks for the replies.
Is this something i could do myself?

 

[Andygasman2010]

Well you don't need to be gas registered to do this so it depends how confident you are you may get wet!

 

[acko]

To be honest i wouldn't know what i'm looking for.
Think i need a sympathetic plumber.

 

[holty]

basically not a bad boiler.its just a rebadged glowworm CI.(p.s CI parts are cheaper).plate heat ex is not a hard job for a decent RGI.

 

[combispecialist]

get the plate cleaned/replaced then get the engineer to quote u for a suitable sludge filter which then will hopefully prevent the plate blocking up again in future