Over the past couple of days our valliant boiler has developed a strange problem. When the ch comes on in the morning and the hw is being used at the same time, some how water is getting into the ch system and the pressure in the ch system goes upto about 4 bar and then starts overflowing via the over flow pipe, at the same time the boiler is making a funny noise. What we have been doing when this has been happening is reducing the pressure by opening the ch drain valve and once we have done this, then its OK and continues to work. We have had problems in the past with the boiler, its started off when the pilot light kept going out and that sorted itself out, then its was the rads getting hot when the ch system was off ? the only part we have changed since having the boiler is the diaphram. I changed the filler loop just the other day but that didn't help, could this be the diverter valve ?
- posted
20 years ago