I had to drain the water from my central heating system and since refilling, I cannot get the combi boiler to work. I think the noise I can hear is air preventing the pump from circulating the water. Consequently, the boiler does not light.
The combi boiler is installed higher than the radiators on the first floor. I've tried venting the pump but only a tiny amount of air is expelled and not enough to fix the problem. All radiators have been blead as well.
It's pretty cold in here right now so would appreciate any help/suggestions people can offer.
Thanks Stuart