Radiators Hotter Than Usual

[keithmdw]

My central heating pump is knackered (horrible knocking rumbling noise when running). Any way - plumber is booked and is coming out later this week to change it.

In the meantime however I have noticed that my radiators seem to be getting much hotter than usual and one in particular (the first in line) is getting a lot of air in it.

Is this all likely to be related to the dodgy pump or do I need to get the plumber to look at this as a seperate issue?

I was under the impression that air in the radiator would make it cooler but it is just as (extra) hot as the rest. I keep bleeding it to get the air out. Now could it be that they are actually running cooler and when I bleed the airy one they heat up so I think they are hotter?

 

[namsag]

Rads gettin hot . If you have not adjusted your boiler stat then there is a good chance its on its way out.

The knocking and rumbling noise are you sure its the pump because a failed boiler stat heats the water up that much it thumps and bangs through the system and up into the header tank

 

[keithmdw]

It is definately the pump knocking. You can feel it if you put your hand on it and the sound is definately from the pump.

The hotter than usual feeling I only really noticed yesterday and this morning and I have bled the radiator yesterday so that is what made me think I may just be used to a cooler temp due to air and now have full heat.

Is the boiler stat easy to check?