The boiler in my house (Valliant) was inherited from the previous owner, hence no instructions. I have to keep on opening a valve to underneath the boiler to increase the pressure as it keeps dropping below the red line (just below 1 bar). The other day I forgot the switch the valve off and the pressure went above 3bar and the overflow was dripping (which was good), but within 3 days the pressure was below the marker. Surley this can't be right. I should not need to keep on topping up the system every week or so, should I? What could be wrong?
PS - I can't see any leaks in the house and all the rads are okay.
PS - I can't see any leaks in the house and all the rads are okay.