Cold radiator

petlen

Just fitted a new radiator and it's hot at the top but cold at the bottom also I've noticed that the return side valve and pipe are cold any ideas thanks

Citizenpain

petlen wrote: »

Just fitted a new radiator and it's hot at the top but cold at the bottom also I've noticed that the return side valve and pipe are cold any ideas thanks

Bleed it . Small valve at top. Open it until water flows and close again

Wearb

Hot at top means that it’s unlikely to be air.
Is it cold all over the bottom or just bottom centre?

Turn off a couple of other rads nearby to see if the problem one improves.

petlen

Wearb wrote: »

Hot at top means that it’s unlikely to be air.
Is it cold all over the bottom or just bottom centre?

Turn off a couple of other rads nearby to see if the problem one improves.

Rad is bled cold all over the bottom I'll try turning off the rads nearby thanks

JamesM

petlen wrote: »

Just fitted a new radiator and it's hot at the top but cold at the bottom also I've noticed that the return side valve and pipe are cold any ideas thanks

Are you sure that the return side valve is fully open ?

petlen

JamesM wrote: »

Are you sure that the return side valve is fully open ?

Yes return valve fully open, turned off 3 rads close to this one but no luck still the same??

Wearb

petlen wrote: »

Yes return valve fully open, turned off 3 rads close to this one but no luck still the same??

Did the ones you turned off go cold? If they did, turn them all off except the troublesome one and see what happens.

Wearb

Wearb wrote: »

Did the ones you turned off go cold? If they did, turn them all off except the troublesome one and see what happens.

Perhaps also explain in detail the plumbing for the new rad? ie pipe size, length of pipe, where connected to the system, number of rads in total and heat source.

petlen

Turned off all rads and it's got a lot hotter 2/3 way down still only warm at the bottom 3rd

beefburrito

I have a similar problem, I turn off all the rads on the right hand side,its then I leave the problematic rad on.
Then I blow the whole lot through,by turning on the system.
Leave it go red hot then, turn on the rest starting from the nearest to the boiler, it should work.

No point in calling in a plumber to do the same....

K.Flyer

If the radiator is Hot at the top it Does Not need bleeding or venting, it will not fix the issue.
You Only bleed or vent a radiator when it is cold at the top and hot lower down.
And bleeding other rads that are all working fine in order to rectify another problem rad will not make a blind bit of difference.
Cold on Top, hot lower down = venting required.
Hot at Top, cold lower down = circulation problem.

As suggested above, shut all other rads except one to purge air from the pipework, repeat with all rads. Then vent out whatever air may have gathered in each rad, when finished ensure water pressure in heating system is correct.

petlen

K.Flyer wrote: »

If the radiator is Hot at the top it Does Not need bleeding or venting, it will not fix the issue.
You Only bleed or vent a radiator when it is cold at the top and hot lower down.
And bleeding other rads that are all working fine in order to rectify another problem rad will not make a blind bit of difference.
Cold on Top, hot lower down = venting required.
Hot at Top, cold lower down = circulation problem.

As suggested above, shut all other rads except one to purge air from the pipework, repeat with all rads. Then vent out whatever air may have gathered in each rad, when finished ensure water pressure in heating system is correct.

Thanks all for the advice shutting all rads sorted the problem