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I have a central heating system that runs from a stove burning wood mostly and smokeless fuel overnight in Winter. I fitted the system about 25 years ago but the stove was changed about 10 years ago.
Problems started over year ago when the radiator in the extension, which is used as a store room only, wasn't getting hot. I found if I turned the flow valve on and off a few times it then worked. After a while it only worked if the pump was turned up to 3 as well. Now it doesn't get hot at all. But it isn't a living area so it isn't that important.
Now the same thing has happened in the kitchen, which is teed off the same feed.
I changed the kitchen radiator but not the valves and did not drain down the system. That made no difference but the water seemed to fill up in no time.
As the pump was 25 years old I had bought a spare as I imagined one day fairly soon it would suddenly not work. So I changed that yesterday but there is no difference.
I am thinking about this for a while before I do anything else. The kitchen is next to the room where the stove (20 kw) is, so if the door is open, it is not really cold, but I want it working again soon.
I can see the pipes that feed these radiators as they cross the top of the cellar. They seem to get warm but not hot. Ironically this is the newest part of the system with 15mm plastic feeds teed into 8mm copper near the radiators.
The old part which is 15mm copper into 8mm copper is fine. The spare room and the bathroom both are fed by the same 8mm pipes and both work by gravity if the pump is off. The whole system has worked well for years.
Any ideas? Why did turning the valves on and off work before?
Finally the new pump seems a lot noisier. I must have let a bit of air into the system in the fitting process but I would have expected it to be gone by now. OR is it that these cheap chinese pumps are noisy. I still have the 25 year old one which in retrospect was OK.
Problems started over year ago when the radiator in the extension, which is used as a store room only, wasn't getting hot. I found if I turned the flow valve on and off a few times it then worked. After a while it only worked if the pump was turned up to 3 as well. Now it doesn't get hot at all. But it isn't a living area so it isn't that important.
Now the same thing has happened in the kitchen, which is teed off the same feed.
I changed the kitchen radiator but not the valves and did not drain down the system. That made no difference but the water seemed to fill up in no time.
As the pump was 25 years old I had bought a spare as I imagined one day fairly soon it would suddenly not work. So I changed that yesterday but there is no difference.
I am thinking about this for a while before I do anything else. The kitchen is next to the room where the stove (20 kw) is, so if the door is open, it is not really cold, but I want it working again soon.
I can see the pipes that feed these radiators as they cross the top of the cellar. They seem to get warm but not hot. Ironically this is the newest part of the system with 15mm plastic feeds teed into 8mm copper near the radiators.
The old part which is 15mm copper into 8mm copper is fine. The spare room and the bathroom both are fed by the same 8mm pipes and both work by gravity if the pump is off. The whole system has worked well for years.
Any ideas? Why did turning the valves on and off work before?
Finally the new pump seems a lot noisier. I must have let a bit of air into the system in the fitting process but I would have expected it to be gone by now. OR is it that these cheap chinese pumps are noisy. I still have the 25 year old one which in retrospect was OK.
