Not a lot really. I've heard of the flexible rubber pipes splitting and F75 fault can be a nuisance, but apparently it's been sorted now although can be made worse if system not cleaned thoroughly.
I've had 1 noisey pump at the 1st service and called it in, customer hadn't even noticed and 1 pump died after 2 1/2 years, but Vaillant still replaced it FOC.
You must have an FGA to commission them, yet to have one out of the box that is set up correctly.
All in all personally I've had no major problems with any 600 or 800 series boiler
Vaillant are what we recommend but cost drives the customers choice.
Have had only 1 eco tec pro come out of the box with faulty dhw sensor and one 937 with faulty shift load pump and been back to it tonight for a split rubber hose where the jubilee style crimp is too tight.
In my opinion Vaillant are going downhill fast!
F75 is still an unresolved problem. There technical support has become virtually nonexistant. Im pi@@ed off with them at the moment. Half an hour wait to speak to techs today and then they hang up phone when they cant answer question.
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