I have bled all radiators and tried adjusting pump at different settings. This system has been in 6 years and only started giving this problem in december.
When the burner switches off on my oil fired central heating about 5 mins later hot water comes out the overflow from the heating expansion tank. I tried cleaning the system and bled the whole system but this had no effect. I also tried the following : with the heating off I let the expansion tank f...
