1. Boiler is an aged Glowworm but still works great
2. Expansion tank is filling from the hot water cylinder it seems, as water is hot when heating/water is on, otherwise it still fills but cold. It then runs from the overflow outside.
3. Started earlier this week, but nothing had been done work wise except a few days earlier I had upped the stat a little due to the inclement weather 9from about 140deg F to about 160deg F.
4. Having read everything about this issue, I suspected the cylinder coil was leaking so I've fitted a new cylinder but it's still leaking from the overflow. (£200 wasted 'cos I'm dumb!!)
5. Don't know if it's related but ever since I had my bathroom redone about 4 years ago, two radiators downstairs have failed to heat up properly. Since I changed the cylinder yesterday, they aren,t heating up at all. I have removed them and cleaned them out several times; flushed the whole system several times. The rads concerned always refill OK and have previously warmed up (tops only) so I can't see it's a blockage.
My system is gravity fed with a small CW feed tank to the heating circuit and a large F/E tank for the hot water cylinder. It has a two-port valve for the heating circuit and a small Grundfos pump which I cleaned out a few months ago (it was seized with crap inside). Just looked at the pump and noticed the writing on the cover is upside down. Not sure, but it's possible I've put it back on upside down, although this overflow problem has only just started and did the pump months ago.
Any advice would be much appreciated. I'm not a plumber by trade, but I would like to at least have a go myself first, so advice on any testing etc. to locate the cause would be great.
2. Expansion tank is filling from the hot water cylinder it seems, as water is hot when heating/water is on, otherwise it still fills but cold. It then runs from the overflow outside.
3. Started earlier this week, but nothing had been done work wise except a few days earlier I had upped the stat a little due to the inclement weather 9from about 140deg F to about 160deg F.
4. Having read everything about this issue, I suspected the cylinder coil was leaking so I've fitted a new cylinder but it's still leaking from the overflow. (£200 wasted 'cos I'm dumb!!)
5. Don't know if it's related but ever since I had my bathroom redone about 4 years ago, two radiators downstairs have failed to heat up properly. Since I changed the cylinder yesterday, they aren,t heating up at all. I have removed them and cleaned them out several times; flushed the whole system several times. The rads concerned always refill OK and have previously warmed up (tops only) so I can't see it's a blockage.
My system is gravity fed with a small CW feed tank to the heating circuit and a large F/E tank for the hot water cylinder. It has a two-port valve for the heating circuit and a small Grundfos pump which I cleaned out a few months ago (it was seized with crap inside). Just looked at the pump and noticed the writing on the cover is upside down. Not sure, but it's possible I've put it back on upside down, although this overflow problem has only just started and did the pump months ago.
Any advice would be much appreciated. I'm not a plumber by trade, but I would like to at least have a go myself first, so advice on any testing etc. to locate the cause would be great.