3 rads not working - rest are fine

[ian99]

Hi,T

I've just installed new radiators throughout the house. Most are regular convector rads, however i bought 3 graded designer column rads - they were graded because of slight cosmetic blemishes. All rads are working except these three. On 2 of them the pipes leading to the valve and TRV are hot and on the third the pipes are not. 1 of them is slightly warm in a couple of areas of the radiator (not the bottom). All rads have TRVs on them. I have a vaillant system boiler and a megaflow system. Some of the rads upstairs are not as hot as others, although all heat up.

Can anyone suggest what the problem is. I assume unless the 3 rads are leaking they cant just not work.

I would appreacite any help and advice

Thanks

[gas man]

have you vented them on re filling?

[ian99]

Hi,

Yes, althought the water comes out in little spurts, so not a constant flow of water

[ian99]

Also, the megaflo was a systemfit one, so came preinstalled with a pump.The guy I had to install it took the pump off as he said that the vaillant 837 system boiler its connected to already has a pump - is this right?

[gas man]

try knocking the rest off to pressure the new ones into working

[ian99]

OK will try that. Thanks. Just wanted to confirm that unless the rads are leaking they cant just not work (so stop working like electrical items)? Sorry, might be a stupid question but someone said they just dont work so may need replacing - but I cant see if they dont leak how a radiator could just not work

Thanks

[Avatar]

A radiator cannot - 'stop working' as such, there is a fault which will cause the problem. Radiators are solid items without moving parts that can 'go wrong'!

You have definately got air trapped in them anyway!

[stevew451]

and vent with the boiler off

[shneld]

If no luck try balancing the system out.