Smelly Pipes

[scattycat]

We've recently had a washing machine plumbed into a large walk-in cupboard in the hall. The machine used to live in the kitchen and was perfectly happy, but now it's moved to the cupboard it's a bit stinky. I don't think it's the machine itself, as it's not very old and we've tried running a hot wash without any clothes just in case, but no joy. The new waste pipe has a conventional U-bend, and it's a cold-fill washing machine. Any clues?

[Lil O'lady]

Try putting some bleach into all the detergent tray and the conditioner trays and running the machine with nothing in on a very hot wash, then run it again just with water to flush oput any trace of bleach.
It might be that your machine has various little u-bends of pipework where 'grey' water can accumulate, causing the pong.
Also, see if you can check how it is connecting to the outflow. If it's been connected directly to a soil pipe from your bathroom, without a final U-bend, it might be allowing some pong in from there.

[Lil O'lady]

Sorry, just read your q properly, you do have a U-bend at outflow.
Another thought, in warm environments clothes can get pongy amazingly quickly if not taken out of the machine straight after the wash has finished - could be another source?

[scattycat]

Hi. Thanks for answering.
I don't leave clothes in there, so it's not that. Plus I really don't think it's the machine itself - I think it's something to do with the new pipework.
Would like to give the bleach-in-the-soap-tray option a go, but bit worried about putting bleach in the washing machine. Will it damage it?

[cast222]

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[davewr]

My mother in law was only using her washer a couple of times a week and the water in the trap was evaporating as it was a warm room. I managed to make the U bend deeper and that stopped the smell getting through.

[RAYMAN]

davewr Smart thinking

[dixons]

Hi There sounds likethe length of the waste run is the problem, the syphonic action of the water discharging down the pipe is drawing the trap seal (pulling the water out of the "U" bend in your language) this then allows odour's to come back up thepipe and enter the room.
Try changing the trap to an "Anti Syphon Trap" or "Sink Trap & Tee Vent System" both from McAlpine plumbing products
obtainable at most Plumbers merchants.