Thanks Madrab. I've ordered a new trap/siphon. Interestingly, there is/was no washer/seal where the whole unit attaches to the exchanger (someone forgot to put it back??). So perhaps this has negated the whole "siphon" effect. We'll see when the new siphonic/trap unit is fitted (WITH washer...
Oh, ok thanks for that. This is the first thing I checked on mine, and all was ok. And on my Glow-worm, the syphon is a simple fixed "divider" between two levels of condensate with no moving parts (apart from the float inside the actual trap) so no solution there either. Anyway, I much...