Thanks for the advice.
I just checked that both traps are clean and clear. I couldn't get anywhere with a wire hanger. The waste pipe goes down vertically before turning off and I can't get further than that.
I'll get someone in to redo the pipes and check for blockages.
Thx, I'll have a look on Friday. My main worry is that the waste pipe is hidden behind tiling and is at least a couple of meters long. Would you suggest using a wire hangar or something like that to poke around.
I was also considering using one shot drain cleaner (sulphuric acid) or caustic...
I had a new basin fitted last year as well as part of a refurb. The waste pipe going to the main stack was also newly fitted as part of this work.
Drainage worked fine until just recently but then it started draining pretty slowly. I had a look at the pipework underneath but it was so flimsy...
CM927 thermostat is showing current temp of 18 deg. As the flat is quite cold I set the target temperature to 21 deg. The thermostat shows a flame symbol and the receiver shows a green light. This suggests that the thermostat is asking for the boiler to switch on.
However, the radiators are...