Auto air vent failure Worcester combi

[Gossamer]

Evening,
My Worcester combi had an auto air vent failure with water leaking out of it.
Worcester came and swapped it out under warranty but said I had to get the system flushed otherwise they wouldn’t honour further warranty repairs.
I’m not aware of any testing undertaken, just a visual inspection of the component.
It’s occurred to me that my warranty is now effectively on hold until I spend 800 quid getting a system power flushed.
Does this seem reasonable?
Cheers

 

[mcmoby69]

£800?
Size of house and amount of rads?
Get 3 quotes. Consider getting a filter fitted

 

[Gossamer]

Yes.
Seven rads.
Three bed semi.
System six years old and has a magna cleanse.
I think he based it purely on looking at the failed part not testing the system water.

 

[Madrab]

Chances are it was pretty apparent to the engineer from the colour of the system water (black), when they depressurised and drained the boiler to fit the new AAV.