Ravenheat 820/20T combi

Joined
14 Aug 2011
Messages
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Location
Staffordshire
Country
United Kingdom
Hi
I have one of these boilers which I installed in 1995 and to be fair for a 16 yr old combi its done very well indeed. I am trying to prelong its death so any help would be appreciated. Its developed a hot water fault whereas when you open a hot tap or the shower it fires up find and the water gets hot but shortly after the burner shuts down maybe for a min or two. Then it fires up again and normally works fine after that. A bit of a problem when soaped up in the shower as you can guess!! Everything seams to be operating ok. D valve ok, micro switch coming in and out when DHW tap opens, Stat working;high-low rate. The boiler started Kettling last year so I flushed a noise reducer which worked and its very quiet again now. Theres a high limit stat which may be connected to this problem but would of thought this would either work or not. Can anyone possibly help??
 
Thanks for your reply on this.
This boiler doesnt have a plate heat exchanger if i can remember. I have used a sludge remover and then added inhibitor over the last few years. Just puzzlin me as it only shuts down minuets after it fires up. But then fires back up a few mins after that and then works ok again. erggggggg
 

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