The reason for wanting to know my 'rights' in advance was that they were very defensive when I first contacted them this morning, almost trying to get out of the fact its under warranty. I did wonder if the standard tatic is to say its not under warranty...
I rang a local Viessmann approved instaler earlier, he could come our tomorrow, but if it needs parts he couldn't get them until next week.
Rang Viessmann again and they said no I couldn't use any own engineer and recharge... Its all in there T&C's
Just had a call to say there will be an engineer out on Monday.
I had them out before not long after the boiler was new (now 4.5 yrs old) and at that point the services was fantastic, maybe now they are more busy and there service gone downhill a bit..
The query at new was actually an installer cock up and not an issue with the boiler.