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Ariston undersink heater making noise?

2 problems: 1st - a constant noise I think may be the expansion vessel, is it repairable or only replaceable? 2nd - pressure release safety valve is leaking outside continuously - can I reset it or does it need new washer or replacing?
Wendy, May 2016
Thanks toptrish

Wendy, May 2016
The noise could be the valve discharging, It is either from over pressure or faulty.The valve is replaceable,quite a simple job if you know what to do

toptrish, May 2016
link Click here to see other fixes for Ariston.