worcester hi flo 400 rsf

Joined
4 Sep 2006
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United Kingdom
dear all my6 year old boiler has developed a fault that when the hot water is in use the radiators upstairs also get hot and there is a strange crackling noise from the boiler. I have assumed that the diverter valve may be faulty but would like advice, Thanks :?:
 
Its more often because a blockage (normally dhw heat exchanger) forces the flow to push open the diverter valve.
 

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