You probably wont believe it, but he was the plumber who installed it. i will see if he can fix it with your advice but if not will get someone else in. :?
i phoned the vaillant helpline at 50p per minute!!! and they suggested the installer should check the combination seal. When i suggested this to the plumber i dont think he had a clue. Could it be do with this or do you think its more likley to be a problem with the fan?
We have a Vaillant Combi boiler which is not heating the water or making the heating come on. Only when you take the main silver case slightly off to let some air in it then ignites and we can use both the heating & the water. Our plumber has so far replaced the diverter valve and the air...