Noisy ultracom 2 24cxi

[Chris head]

Hi, I was wondering if any GSE have come across this problem I have found on 3 boilers 2 Glow worm and 1 Valliant in central heating mode it is very quiet, however in hot water when at full rate it gets quite noisy, more vibration than anything yet not parts loose. I look forward to hearing from any one who has come across this issue.:yes:

 

[IDCHAPPY]

My Vaillant sounds like a jumbo taking off when i have it on full DHW mode. It works so I've never been ar$ed to look into it :lol:

 

[Wychwood]

Hello I got a customer who says that the Worcester 38cdi classic I fitted 2 months ago has just started making a loud droning noise in hot water and sometimes in in heating, I haven't been round yet to investigate, anyone have any pointers? System pressure is ok and he says there isn't air in system????