Sewage smell overnight but not daytime

[SteveH2]

We think that this is connected with the upstairs loo, the boxed in waste pipe comes through the spare room and then out the house.
There is also a downstairs loo at the same end of the house

There's a poo smell, but really only happens in the early hours. It's not connected with anyone flushing the loo.

Just to add to it the upstairs loo doesn't flush that well and often needs 2 or 3 flushes to get rid of the waste. It empties a bit slowly, say 3 seconds instead of 1.

So I'm thinking maybe it needs a sort of dyno rod fix? What please do people who know what they're on about think?

Steve

PS We've lived here for >10yrs, this started a couple of years ago.

 

[rpm]

Smell upstairs or downstairs bathroom.
Is there water present in both toilet pans in the morning before use.
Could try placing plugs in basin wastes and tape over shower wastes to see if things change.

 

[SteveH2]

Smell upstairs or downstairs bathroom.
Is there water present in both toilet pans in the morning before use.
Could try placing plugs in basin wastes and tape over shower wastes to see if things change.

downstairs
Thanks for the tip,I'll try it