2 x cold radiator question

teflon

Can anyone offer some advice. 2 rads are cold when heating is turned on. If I turn off upstairs rads and the other ones downstairs the 2 cold ones will heat up. They get about 80% hot if both put on together but if these 2 are put on separate then they are piping hot. When I turn back on all rads they remain hot but if the heating goes off and I put it back on in the evening I am back to square one and the 2 are cold again.

Ideal vogue combi boiler I think. Rads giving issues are a single one in hallway and a double one on wall behind it in sitting room.

Thanks

Try bleeding them

teflon

When I bleed them only water comes out so there is no air trapped in them.

Sorry, should have mentioned that i have bled all the rads.

phelixoflaherty

Read up on balancing radiators.

You do this by restricting the water leaving the radiator.

teflon

Tried to balance last night and spent ages and they were working. Heating back on this morning and they are cold again.

Wearb

Did they ever work correctly?

Did you change anything?

teflon

https://www.boards.ie/discussion/comment/117984427#Comment_117984427

Yeah they were all working perfectly during the summer. Havent changed anything at all recently. Had a towel rad fixed start of the year as the valves were leaking but all was working fine up till I noticed this the other day when I turned the heating on.

Wearb

.Is there a balancing valve on your cylinder? If you're not sure then post a pic of your cylinder.

EDIT: Just noticed that you have a combi boiler. So unlikely that you have a cylinder.

teflon

I have a cylinder in the hotpress.

Wearb

Unusual with a combi.

Can you see a balancing valve on it?

teflon

https://www.boards.ie/discussion/comment/117986775#Comment_117986775

No. I googled a photo of one and I dont seem to have anything like that on my cylinder. Could it be an airlock or something?

Wearb

Unlikely an air lock when they can be heated under certain circumstances.

Circulation problem of some sort.

What sort of Circulation pump do you have and what's it set to?

teflon

https://www.boards.ie/discussion/comment/117992445#Comment_117992445

Sorry but I've no idea where the circulation Pump is. Is it in the hotpress?

The boiler itself is an Ideal Logic System 24.

Dtp1979

Pump is inside the boiler. No idea how you got the models so wrong.

post a picture of the hotpress please. Include all pipe work

teflon

Here's the hotpress. That's not water on the wall btw. Its glue or something.

Thanks

Dtp1979

A picture says a thousand words. You do indeed have a balance valve. It’s the red wheel valve on the bottom of the Cyl. How open is this valve?

Dtp1979

That magnetic filter is on the wrong pipe too

teflon

https://www.boards.ie/discussion/comment/118009920#Comment_118009920

Stop. Is it? Gangster plumbers fitted that and the boiler! Installer asked me if I wanted a fight when I started to question his work!

Dtp1979

Assuming that pipe is the flow, which it should be.

teflon

I turned off all the rads last night and left 1 of the problem ones on. It heated up to 100%. I then opened up the other one and that got to 100%. Then i gradually opened up all the others a small bit. I tapped the bottom of the problem rads with a rubber mallet and when I turned the heating this morning they all worked and were warm so the problem could be resolved now but only time will tell.

Thanks for all the help folks. Hopefully it's fixed!