I am having major issues with my central heating at the moment.
When the heating comes on, the noise of the pump action is horrendous and continues for as long as the heating is on. There is an additional underlying noise which I can only say at times sounds either a 'low drone' or a car revving its engine and I can also hear 'water gurgling' at times as well. Two radiators do not warm up. One of the radiators that does not heat up I am unable to bleed this radiator as the bleed key does not 'grab' the bleed valve sufficiently. It is generally pot luck as to if all the other radiators heat up.
Also, when we have the hot water on at the same time, the radiators take and absolute age to heat up and more often than fail to heat up.
Any advice / help appreciated...at my wits end