Help to identify open ended pipe in former boiler location

[wavywavylonggrass]

Hello

We've just moved into a house where the combi boiler was relocated from a cupboard in the 3rd floor attic to the ground floor utility room. I've found some paperwork to suggest this was done in 2018.

There is still an open ended white vertical pipe in the cupboard which gives off a strong musty odour, and seems to contain some moisture. It looks to my untrained eye like some sort of trap or stand pipe, wider than condensate type pipes I've seen before.

It seems odd there is smell and moisture after several years, unless the pipe still serves a purpose. It also seems odd to have an active pipe opening into a bedroom cupboard 3 floors above the boiler.

Can someone help identify this pipe? Should it have been routed outside? Can I perhaps in the short term cap the end without causing problems?

Thanks in advance

 

[CountryFan]

Could have been from the boiler condensate pipe, but it's an upstand pipe with trap, typically associated with a white goods appliance such as a washing machine. My guess is the trap has been syphoned out or dries out if the property has been left empty for some time

 

[Madrab]

It's what's called an appliance standpipe, chances are it was used for the condensate for the boiler.

The U bend trap may still have stale water in it or it will have evaporated and you are now getting waste smells back up through the pipework. Boil a kettle and flush some hot water down it in the short term to clean it out. If no longer a requirement, it should be cut and capped back at the branch point. The ones that removed the boiler should have at least capped it