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loud diverter

soot5bic
soot5bic Member Posts: 10

have a 1 year old viesmann vitodens 100 w gas condensing boiler with seperate hot water tank. Boiler works great but i notice that when diverter switches from hot water to heat there is a rather pronounced valve noise, not grinding but rather a low groaning noise. Can anyone out there tell me if this is normal operation noise or should i be hearing anything at all when diverter switches modes?