Before opening the valves, I just want to ensure that they are the right ones: "cold main input" and "heating return". And I should open them at the same time, for some seconds?
Thank you again.
I have Alpha CB24/28 boiler. For 2 day we have had no heating, no hot water and indicator neons A and B are flashing on and off alternatively, which means by fault finding instruction leaflet - low pressure. If system pressure is low repressurisation is required. But how to do it. I found under...