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worcester junior 24i h/w ok but noise when c/h used

Joined
13 Dec 2009
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Location
Sussex
Country
United Kingdom
hot water fine but when heating switched on, loud banging & eventually lockout. pressure 1 bar. any pointers please? (pre condensing model)
 
Possibly pump siezed, hot water would still work to an extent.

If not are all radiators turned off? If the water has nowhere to go it will just overheat
 
If you want to see if you can fix it or identify the problem then see the FAQ on this site about checking pumps.

Tony Glazier
 

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