Help! Potential soil stack issue

I live in a block of flats and the flat above me is having an issue in their on suite bathroom with heat potentially rising up through the soil stack which is causing water damage to their flat and their mains drainage pipes are extremely hot to the point of venting steam.

I do not have this issue, neither does the flat directly below me (same layout), however at present the toilet in my on suite is out of use due to a broken cistern, so I am using a different toilet on the other side of the flat.

Before I go paying out for a plumber to resolve something that might not be my issue, does anyone have any idea on what would be causing this?

Thanks in advance.

Advice from 3 local tradespeople

There’s no way there should be steam in the stack vent pipe at all unless your toilet is connected to a hot water feed and you’re flushing with hot water every time you use it, have you had any plumbing work done in the bathroom recently?

There could be a unvented cylinder discharging into stack a visit is only way to diagnose

There could be a number of issues that can effect the soil pipe and cause issues... from what you have said the most likely reason would be to do with the ventillation point at the top of the soil stack. It could be blocked or faulty. It's best you get a professional ro look at it to get a definitive answer.

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