Many thanks for your help - i plan to have a look at the weekend, from what you said it makes a lot of sense why the problem only occurs after the heating has been on for a few of hours.
[quote="htg engineer"]Could just be something as simple as the radiator valves, try openning fully - if this solves it I would replace the radiator valves. You say the radiator stat - do you mean TRV's ? if after 2 or 3 hours the other radiator valves close as the temperature is reached, i...
Hi I have a oil fired central heating system but once the heating has been running for about 2 - 3 hours i get a increasingly loud vibration through mainly 2 of the down stairs radiators which can be stopped by twisting the rad stat but normally returns later. I have checked the flow direction is co...
