Vaillant 630 - water overflowing from condensate trap

benjiman · 15 Dec 2015

Hello,

Got a Vaillant 630. Seems to be problem with the condensate trap. Has been pushed and twisted in, rubber seal is on. Once trap is full, should periodically discharge contents into overflow.

However once it is full it just starts leaking from where it is inserted rather than going into the overflow and out to the drain.

Any ideas?

Ta.

Langleyheating · 15 Dec 2015

Hi benjiman..

Have you checked the outlet pipework for blockages. The trap is syphonic so any blockages downstream would stop water from leaving the trap??

benjiman · 15 Dec 2015

Hi, Langleyheating,

I disconnected the overflow pipe from the boiler to eliminate possible pipework blockage. However its still leaking from condensate trap connection.

Langleyheating · 15 Dec 2015

Unusual for the trap to leak. Does it appear to be leaking from the point where the transparent bottle locks in to the white plastic. If it's fully located correctly they rarely leak. How old is the boiler, possible the actual trap itself (not the clear bottle) is partially blocked

St0rmer66 · 16 Dec 2015

Are you aware that leaving the condensate trap incorrectly fitted or without sufficient water in it could cause carbon monoxide to enter your house? It is not a DIY job to remove and play with.

Langleyheating · 16 Dec 2015

Stormer is 100% correct if you haven't fixed it already time to get your local registered gas installer to take a look

benjiman · 16 Dec 2015

Thanks lads.

Yes am aware of this. Theres not many ways to fit this thing, its either in there or not, so was wondering what else could cause this issue. No blockages, so must be something else.

benjiman · 17 Dec 2015

Is the syphonic trap's functioning dependent on any sort of negative pressure being present to periodically release the condensate?

Anyone know exactly how these traps work? Is the function independent of anything else within the system?

St0rmer66 · 17 Dec 2015

They rely on the outlet pipe having a continuous fall throughout the entire length. Even a slight incline can stop it. An open end too, can't be submerged.

benjiman · 17 Dec 2015

Thanks St0rmer66. Very odd then. The outlet pipe has been removed temporarily, so that removes the possibility that there is not sufficient slope, yet no discharge from there, just dribbles out of where the trap is inserted. So overflow fills up to max, then decides not to exit through the outlet pipe. Stumped on this one!

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Vaillant 630 - water overflowing from condensate trap

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