Central Heating

Thimble screws no water coming out. No heating. Hot water seems ok.

Anonymous user 28/02/2024 - 3.24 PM

Guys I have a Open vented central heating and hot water system. F & E tank in the loft. Hot water storage cylinder in airing cupboard upstairs Boiler downstairs (by ceiling) Had to drain down the system to the boiler return drain point. So everything above that point would not have any water in it (or very little anyway). Filled up the system very slowly form the F & E tank in the loft. Before switching on system. Bled air from radiators downstairs. Bled air from radiators upstairs. Bled air from pump by undoing the screw in the centre of the pump. Tried to bleed air form the 2 thimble screws above & near the pump & the 3-port valve in the airing cupboard; they are next to the hot water tank. But no water came out of them. Was only turning the thimble screw about ½ turn. Started the system. Hot water seems to be working ok. Central heating system won't come? Any thoughts. Thanks PS - if the rubber seal is perished, is it possible to just replace the rubber seal, by getting a standard rubber washer and trimming it down to size?