Water backing up, leaking out boiler

[Neil1975]

Hello everyone,

I need a bit of advice please. I have bought a flat and have an issue in the kitchen. There is a boiler, then dishwasher, then washing machine, then sink in that order right to left along the same wall. The waste runs all along the one pipe, starting with the condensation pipe from boiler which joins first, then the dishwasher and so on. The waste all goes away into the main waste pipe, downwards, at the far left of the kitchen.

I noticed a leak from boiler which was checked out, precautionary tightening and clean out of condensate container, but still leaks. I have now found this to happen only when dishwasher is on, so I think there is water backing up the waste pipe, up out the condensation pipework and out the bottom of boiler. It's a minor leak when it happens.

I might be able to fix the issue myself, depending on what is required. Would anyone be able to provide advice on how this plumbing set up should be implemented please?

Many thanks, Neil

 

[rpm]

What size is the pipe, is it all the same size?

 

[Neil1975]

What size is the pipe, is it all the same size?

Hi, oh not sure size, I'll check tomorrow and reply when I'm back at flat. It is all same size, except the condensation pipe coming from boiler which is very small, like radiator pipe size.

 

[rpm]

The pipe from the boiler is possibly 21.5mm with the other possibly being 32 or 40mm. Knowing make & model of the boiler might help the guys/gals out with advice.

 

[Neil1975]

The pipe from the boiler is possibly 21.5mm with the other possibly being 32 or 40mm. Knowing make & model of the boiler might help the guys/gals out with advice.

That sounds about right. It's a Worcester Bosch Greenstar something or other. I will confirm all the details from questions tomorrow afternoon, when I will be back in the flat. Thanks for your input and support so far.
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The pipe from the boiler is possibly 21.5mm with the other possibly being 32 or 40mm. Knowing make & model of the boiler might help the guys/gals out with advice.

I will get some photos too 👍🏻

 

[king of pipes]

Hhmmm condense pipework is considered part of the boiler and as such we shouldn't be giving advice on the forum all I will say is the pipework should be clear and free flowing , I would say employ a GSI to check the boiler and it's safety. Kop

 

[Roy_66]

Agree with KOP.

There might be something like an S bend trap on the sink that's blocked, BUT that can happen again even if you fix it for now.

So get a qualified boiler engineer to first check the waste and condensate design is all correct.

Roy (amateur)

 

[Neil1975]

Hi, thanks everyone for the input, sorry for late response it's been a hectic few days. Gas engineer checked it out and everything looks good with the boiler side of things. I've been unable to force the leak over past 3-4 days so am confused. Just going to keep eye on things for now. It has come and went before.

Thanks again everyone.