Vaillant EcoTec F29 Error Code

Hello, it takes quite a long time, as in months or years, for food build-up to block waste pipes as the plug hole only lets small food items in so one large chunk of food cannot just go down and block it. It must have been small bits of food over a long time. If he fitted a new boiler to an existing condensate pipe and the old boiler was working fine from that same condensate pipe then he'd have no reason to do anything with the sink waste end of the condensate pipe as there would be no reason to suspect it would be blocked or the old boiler would have had the same issue. If, during the boiler installation, he fitted a new condensate pipe from boiler to sink waste pipe then his new 21.5mm pipe would have been completely clean and couldn't have got blocked in such a short space of time. So to be fair, if it was an existing condensate pipe not fitted by him, and really was blocked as the engineer said and he saw visual evidence of a back-up of condensate water and food debris then that would cause an F29 fault code and it wouldn't be his fault. It might have been a good idea for him to photograph the blockage as evidence or to reassure you as you were not present at the time but if you get an F29 again soon then you'll know his diagnosis was incorrect. If you don't it looks like he was telling the truth. I haven't had any brand new Vaillants have an F29 fault code although it can happen several years down the line to some. Also worth mentioning, in stormy weather like we have had over the past three weeks, a gale force wind can affect the operation of the boiler if the wind overpowers the boiler's fan. This would not happen normally but only in VERY strong winds and an exposed flue terminal, it is possible to have ignition lockout because of the wind. Again, the winds have died down now so the F29 should not reoccur unless similar very strong, prolonged winds in future from the same direction. Hope this helps!

The condense pipe should have its own pipe run not connected to the kitchen sink! The error code will be back within the next few weeks. Potentially could be a gas valve error as I’ve come across it in my time. Hope this helps

For sure will be back within the next few weeks wether it be F 28, 29 or 54 The gas valve is at fault Manufacturing error is all i can put it down to due to the amount of times i have come across it

Yes pay the man