Problems with Vaillant boiler flames

[Wheatman]

I recently had my boiler stop working and discovered water had leaked into it and damaged the PCB. I fixed the leak in the ceiling and replaced the PCB but since then i have had a problem with the flames within the boiler.

When the boiler (Vaillant Combi Heater VCW T3W) kicks in, the flames do not just burn vertically but some "escape" and burn in the gap between where they should be and the outside wall of the boiler. These flames are then heating the boiler and the fumes are not escaping though the flue. After, for example, a shower there is an extremely noticeable smell in the house and the outside of the boiler is too hot to touch.

Does anyone know what could be causing the problem and what i can do to resolve the issue?

 

[clf-gas]

Does anyone know what could be causing the problem and what i can do to resolve the issue?

switch off boiler this is immediately dangerous. you need a new boiler.

 

[fitz1]

claim off your house insurance.leak elsewhere has caused boiler to bust.

 

[namsag]

Is it a conventional flued t3 if so it sounds like it has sooted up a good service should sort the rolls royce of combi`s. Stop using it till it is done as boiler is life threatening in this condition

 

[Trance Nation]

Apart from sooted heat ex, if thats clear and flue is clear there may be a fault with the burner. I once saw one that had split at the side of 2 burner bars and was burning between the 2.

Probs just needs a good service though !