I have a fairly new pump that has started to whine. It does this about 30 mins after the heating is switched on.
If I just turn the hot water on it is fine but once the heating has been on for 30 mins the whining starts....when the boiler ignites to heat the water in the central heating the...
The rad in the kitchen is cold.....only one that is.
The pipe running to it is hot and if I bleed the Rad then warm water eventually runs out.
The valve is just open / close with a plastic cover on....not a TRV.
I have a back boiler behind the Gas fire.
HELP PLEASE