my vaillant combi boiler makes a whinning sound when the hot tap on the sink is turned on

herdley, April 2008

Probably combination of two things, 1. Low water pressure (check boilers water pressure most should be 1bar if less then you need to fill up using your manufacturers manual) 2. The overall pressure to the boiler is insufficient check manual again. Ignore my user id i do have a clue lol.

Aintgotaclu, April 2008