Vaillant ecoMax Pro not firing, no error codes

Out of interest, how much did they charge you? The cracked main heat exchanger might have been picked up on a service - just for future reference.
 
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We had the boiler serviced by the installers who put it in - not Vaillant direct.

Yes I get that, but what I’m saying is if this has been cracked a while, it should show high readings when they analyse the flue on the service, regardless of who serviced it.
 
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The OPs "regular engineer" is clearly useless.
The cracked flue collector behind the heat exchanger has been a well known issue for at least 10 years, I guess they've not bothered to take the chamber cover off.
 

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