Ariston Boiler water temperature fluctuating

Joined
1 Oct 2009
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Location
Bristol
Country
United Kingdom
Hi
I have an Ariston boiler that I had fitted new 4 years ago. It has been a good reliable boiler up until now and the problem I have is as follows. The boiler fires up ok is working on the heating and hot water, but when I am in the shower the water temperature fluctuates slightly. The temperature will drop by a couple of degrees (not totally cold) and then return back to its normal temperature. The longer I have a shower the more it happens, it never stops completly or comes up with a fault, but just keeps changing water temperature. Annoying but not life threatening I know but I welcome any advice to sort this problem. Thank you
Rob
 
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assuming it's a combi, the plate heat exchanger may be starting to block.
 

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