problem with vaillant - Please Help!!

[Millsy 82]

im not asking you guys for advice so i can do it myself and i never said that im asking so i can advise my plumber what info i have found from the knowledge of you guys, just seems like everyone here wants to throw there GasSafe weight around - im just after some help and if anyone can pinpoint what the issue is, i dont earn much money and id like to order the parts myself and then i can tell my plumber to fit them which will be cheaper for me, im not stupid enough to mess around with something that could cause harm to my family.

and doesnt the law state that you are able to advise someone if you believe they have a level of competence, well my competence is that is that i will inform someone properly competent!!

When I walk into someone's house and they start saying to me it's the so and so my eyes glaze over and I say oh right ok then. I then totally ignore them and go and fault find myself and tell them that I don't want to fit a part off someone else's say so and would rather double check first. 9/10 they are wrong as they are just guessing.

My favourite ones are they want you to bring the part with you. I say ok but you will have to pay for the part and labour to fit it even if it is wrong.

Any engineer that needs the customer telling them what is needed shouldn't be doing the job IMO.