Hi I have a problem with a sewer smell coming from my kitchen cupboard,at first I thought it was my drains as I had a blocked drain last year with an overflowing manhole and had the same smell but I've checked all my drains and they all seem to flowing fine and they also don't smell at all it just coming from the cupboard which is a floor standing cupboard but the smell is very very strong but no sign of any sewage could you help thanks!

This could be caused by a split in the lateral drain line in the wall. Smells are impossible to track down unless you're there to do it yourself. Either open upthe wall od take up the floor of the cabinet to look for moisture. Good luck, tom