Have a Vaillant Ecomax 600 boiler only 2 yrs old. We lose pressure down from 2 bars to 0 in less than 3 hrs. 2 engineers have checked the boiler and say it is OK, it must be a leak somewhere. We have no visible sign of leak anywhere. Can somebody suggest what can the problem be? It is hard without hot water for a long time!
Thanks.
Thanks.