Boiler working but Radiators just not warming.

bclark

I am having major problems with my heating at the moment. The boiler is only 2 years old and seems to be working fine but all of a sudden the radiators are just not warming. There is some slight heat towards the tops but at the bottom there is virtually nothing.

I have drained the sytem in case of air locks and bleeded all of the radiators but still there is no improvement.

Does anyone have a clue?

Lorian

T-Valve stuck, pump not working?

bclark

What is the T-valve? The pump seems to be working fine, there is certainly water flowing through it.

One thing that I have just noticed is that the temperature on the boiler (there are LED's showing what temp it is putting out) seems to shoot right up to 80 degrees within a minute and stay that way for a minute before shooting right down again!

bockster

sounds like the water is'nt circulating very well so boiler is'nt getting rid of the heat, do you have trvs? have they stuck? could it be sludged up? what was the water like that you drained off? anyone messed with the lockshields? does it 'sound' like water is flowing through the system as fast as before?
what type of system is it?

bclark

bockster wrote: »

sounds like the water is'nt circulating very well so boiler is'nt getting rid of the heat, do you have trvs? have they stuck? could it be sludged up? what was the water like that you drained off? anyone messed with the lockshields? does it 'sound' like water is flowing through the system as fast as before?
what type of system is it?

Its a combi boiler and yes it does have trvs. They seem to be ok, I have had them off to check the pins etc. It sounds like water is circulating but I am not sure if its as much as before. It does seem as if it may be the circlutaion so the boiler is only heating what is there and it isn't getting around to the whole system.

bockster

i don't know what a t valve is, but could it be the same as the diverter valve? i would be locating this inside the boiler and seeing if there is any way to overide it. i'm no expert but to the best of my knowledge its like the 3 way valve on a tank system and moves to divert hot primary water to either ch or dhw. do you have the manual to help you check this part?
although it could still be a pump issue, the pump itself can usually be bled via the big central screw on the pump.


edit: been talking to someone more knowledgable, seems diverter valve is not entirely what i thouhgt, and is also connected into the gas system so be careful here. his opinion ispump or airlock issue rather than diverter, is the auto bleed in the boiler working?

Canucklehead

Hi

Pump or diverter problem by the sound of it. Does it work for hot water?
Did you put inhibitor in the system when you refilled it?

Corgi Guy.