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Balancing - turned off all the rads, started with the problem rad turned back on, worked my round to the rad closest to boiler. Temperature difference - yes Origin of whine - inside the boiler somewhere??? I called the Vaillant support line and the women said it sounded like the air...

how long is the guarantee? i'll give Valliant a call. i can't get hold of the original installer, he seems to have disappeared. thanks.

Please can someone try and help me figure out what is causing this high pitched whining. I have tried bleeding and balancing the system but still no joy. System: Vailliant EcoTec Plus Combi Gas Boiler 5 x Hudevad radiators of varying size with thermostatic valves Chrome towel rail in...