Strange noise???

Joined
4 Jul 2005
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Location
Lancashire
Country
United Kingdom
When I turn on the hot water tap my C+M combiit makes a noise that can only be described as "a screeching firework", doesn`t make the noise when the c/heatings on. Any ideas on what the problem might be. Many thanks
 
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Overheating main heat exchanger, possibly caused by sludge blocking secondary heat exchanger.
 
You have posted c&m if it is a chaffateaux celtic hurry up & get rid you will have sludge in the silver braided pipe from pump to heat ex
 

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