I have a Worcester 28i Combi boiler and lately the pressure guage keeps dropping to zero when the heating is off. I have a small tap at the side which allows me to add water to increase the pressure to between 1 - 1.5 bar (as instructed at the time of installation). I can find no leaks anywhere on the system and if left alone on zero the pressure increases to approx 3 bar when the heating is on. I have noticed that on the occasions the pressure dropped to zero and I added water to bring the resting pressure up to 1 - 1.5 bar then when the heating came on the pressure increased to near 4 bar and I had water coming out of the outside pressure pipe
Any help greatly appreciated
Any help greatly appreciated