hello all, i have a combi boiler (condensing) installed a while ago now. i have trouble with water not coming out of my cold water tap on the bath. if i turn on the basin cold water tap then sometimes it will work but sometimes it doesnt with or without the basin tap running.... does this mean i have air in the system and i need to drain the whole system in my house? i have a three bed. if i do need to is it an easy process and wot steps do i need to take to prevent air entering when i fill the system again.
plsssss help