Hi,
I’m trying to drain a central heating system but the drain valves appear to be stuck i.e. no water flows out of an attached hose (the hose is ok). There are four in the system on various lower floor radiators but all seem blocked. They turn okay as if they are opening, so the problem must be the washer or inner part. I unscrewed one slightly too much and black water went everywhere so I don’t want to happen again on the others. I’ve tried tapping them but still no good. Does anyone have any ideas?
I’m trying to drain a central heating system but the drain valves appear to be stuck i.e. no water flows out of an attached hose (the hose is ok). There are four in the system on various lower floor radiators but all seem blocked. They turn okay as if they are opening, so the problem must be the washer or inner part. I unscrewed one slightly too much and black water went everywhere so I don’t want to happen again on the others. I’ve tried tapping them but still no good. Does anyone have any ideas?