I have a glow worm swift flow combi that seems to be experiencing pressure problems 
.
The pressure reading is normally around .75 after a top up, but recently drops to around .3 after CH use. The pressure remains stable when CH not in use (or cold) and I've checked for leaks --not finding any. Once the CH is on, the pressure seems to go up to around 2-2.5 and I have not noticed it reaching the pressure relief threshold or any leakage from the vent.
The boiler is around 5 yrs old. So now regularly topping up and extremely worried about where the water is going. Any ideas?
. The pressure reading is normally around .75 after a top up, but recently drops to around .3 after CH use. The pressure remains stable when CH not in use (or cold) and I've checked for leaks --not finding any. Once the CH is on, the pressure seems to go up to around 2-2.5 and I have not noticed it reaching the pressure relief threshold or any leakage from the vent.
The boiler is around 5 yrs old. So now regularly topping up and extremely worried about where the water is going. Any ideas?
