Combi sounds like a washing machine

[Sanke]

Hello everyone
Recently added a rad for a customer. In doing so drained down system etc, all was fine when I left. He phoned me yesterday to say that since then every time his boiler switches off it sounds like a washing machine finishing its cycle. Got to go & look tomorrow but would appreciate any ideas/suggestions please
Steve

 

[paul H]

hi, make sure the auto air vent cap is loosened and that all the air is removed from the boiler

 

[Sanke]

Not done much on boilers as yet. How do I remove the air from the combi ?

 

[wnjswozo]

it will be air in system you did top it up when you bled new rad,check auto air vent,ask customer if got manual,read commissioning,some combi condensers have certain purging processes