I've made my heating system worse!

[Aire]

However.. To play Devils advocate.. If that's the case wouldn't it be the case that they would work fine with the rest of the rads closed?

The reason they are not currently working is probably an airlock, even with all other rads closed this can still happen. The reason they originallt wasnt working as well as the rest of the house is likely undersized pipework. You can feed 2 rads off a 15mm supply but it depends where those 15mm pipes are tapped off the existing system. If they come off other 15mm feeds then they will suffer with poor flow.

 

[Ivan Android]

How do the pipes in the loft connect into the heating system?

They tee off somewhere on the first floor. There seems to be a dedicated feed and supply that only goes to these 2 rads, I think it's connected near to the pump but I could be wrong. I'd estimate there's a run of about 5-6 meters of 15mm pipe on the first floor before the connections in the picture I posted.

 

[Ivan Android]

The reason they are not currently working is probably an airlock, even with all other rads closed this can still happen. The reason they originallt wasnt working as well as the rest of the house is likely undersized pipework. You can feed 2 rads off a 15mm supply but it depends where those 15mm pipes are tapped off the existing system. If they come off other 15mm feeds then they will suffer with poor flow.

Interesting. At least part of the system is 22mm, I have seen this when fixing squeaky floorboards. I assume this would only compound the issue?

 

[Ivan Android]

The reason they are not currently working is probably an airlock, even with all other rads closed this can still happen. The reason they originallt wasnt working as well as the rest of the house is likely undersized pipework. You can feed 2 rads off a 15mm supply but it depends where those 15mm pipes are tapped off the existing system. If they come off other 15mm feeds then they will suffer with poor flow.

Do you have any suggestions on locating or removing the airlock?

 

[Aire]

So the loft these pipes are in is a ground floor extention? When you turned all other radiators off, did you switch off the hot water at the programmer?

 

[Riley]

Would make sense as they were never as warm as the others. I can't say for sure though as we've only lived here since July so haven't had that much experience of the system in full flow.

However.. To play Devils advocate.. If that's the case wouldn't it be the case that they would work fine with the rest of the rads closed?

No as the smaller bore pipe can only carry so much heat

 

[Ivan Android]

So the loft these pipes are in is a ground floor extention? When you turned all other radiators off, did you switch off the hot water at the programmer?

Darn it. Will do now

 

[Ivan Android]

I've closed off all of the rads apart from the problem ones (and the hot water) and there is heat there.... More than earlier on today but much less than there has been on it's best day

 

[Aire]

Keep turning the pump on and off in cycles of 30 seconds to try dislodge the air, do this for a about 5 - 10 minutes

 

[Riley]

Well yes