All but 2 Radiators heating !!

[Walesy]

Hi

Reasonably suddenly, a radiator in the (upstairs) bathroom and one in the (downstairs) dining room are not heating up. I have bled both.

All other radiators are working very well. I've tried turning some off to see if this would do anything, but no !!

Is there any other simplistic checks I can do to see why this is happening ?

(Combi boiler within one year new installed and system flushed etc at that time).

Many thanks.

Robin.

[roger196]

Start with the obvious.
1 Is the lockshield valve open. Make a note of its position before moving it.
2 Take head off TRV and check central pin moves up and down. This does not involve disconneting TRV body from rad.
Otherwise you have an airlock in the pipes to the 2 rads. Turn off all other rads except one working rad and one of the non working rads. The CH pump should force out the airlock. Once the first non rad is working, open the second non working rad and close the first non working rad.
I have assumed that the two non working rads are not heating up at all as oppose to having a cold area either top or bottom.

[Walesy]

Thanks.

Bit confused about (1) & (2) but anyway.....not DIY minded !!

I take it the radiators should be closed etc when the heating is on - I expect this is a very dumb question !!???

How long should this take to clear (should it just be air) in the system - Standard semi detached with 8 radiators ??

Thanks.

[Walesy]

Hi

Now have the downstairs one working, but the small (last) radiator with no temp control valve is still stone cold after trying every working one only on with it !!

Does anyone have any more suggestions ??

Many thanks.

Robin.