I have a consistent problem with the central heating in that after an hour's use, hot water is being pushed up the over-flow pipe and in to the header tank causing that to over flow with boiling hot water.
The thermostat on the boiler appears to work as it clicks on and off when I adjust and there are no obvious air blocks in the system (all radiators are piping hot all over).
The thermostat on the boiler appears to work as it clicks on and off when I adjust and there are no obvious air blocks in the system (all radiators are piping hot all over).