2 rads won't heat up!!

[dsmart]

New boiler fitted all other rads down stairs heating up 2 bedroom ones on 10mm pipe won't heat up changed the valves and balanced still stone cold hot in the corner of but nothing else doing my head in I've flushed them out with a hose at a loss now

 

[Riley]

Are they teed in in the wrong place ie from another rad??

anything if you shut all the others off??

 

[townfanjon]

The big one ... Did they heat up before ?

 

[jtsplumbing]

Blockage in manifold, or in pipe work to manifold, had this in the past with micro-bore it can be a pain to clear it, sometimes re-pipe to that rad is only option

 

[spanner]

We're they heating up before? #3
These the furthest the ones that aren't heating up?
Obviously bled air out!
Tried opening rad bleed screw with system running see if it gets warmer!!!

 

[AlexGas]

Seen microbore pipes being sqished by the floor boards...! Hope it's not the case.

 

[ShaunCorbs]

you turned all the other rads off ? and forced it through

 

[dsmart]

Yes mate house was empty for 6 months previously so don't know if they were heating up previously turned all the other ones off and forced through still no better changed another lock shield today and it started heating then went stone cold in the space of 5 mins again banging my head off a wall with it now

 

[ShaunCorbs]

Yes mate house was empty for 6 months previously so don't know if they were heating up previously turned all the other ones off and forced through still no better changed another lock shield today and it started heating then went stone cold in the space of 5 mins again banging my head off a wall with it now

the only thing and last thing to do now is re pipe them

 

[dsmart]

Yeah gonna do that tomorrow mate

 

[ShaunCorbs]

Yeah gonna do that tomorrow mate

cus ok with it?

 

[dsmart]

Letting agent lol

 

[ShaunCorbs]

Letting agent lol

ooo worse then

 

[thompsonbrown]

Yeah gonna do that tomorrow mate

Try bleeding both 10mm flow & rtns valves into a bucket first.
I had this problem with a long 10mm run, had to bleed air from pipework even though it was on a combi.

 

[bewsh]

I had a problem radiator the other day, would not heat up at all. Discovered a blockage in the 10mm flow.

Tried pressurising system to 3 bar and then connect hose to rad valve to see if it would force the muck out, but it was literally just trickling out. Ended up back filling the flow pipework through the radiator valve from a garden tap. Disconnected the hose from the garden tap and let the water flow back out, loads of black crap came flying out. Did that a few times and it worked perfectly then.

Could be worth a try before re-piping?

 

[spanner]

Must be manifold microbore . Probably works okay before manifold connection.

 

[GrahamM]

I had a problem radiator the other day, would not heat up at all. Discovered a blockage in the 10mm flow.

Tried pressurising system to 3 bar and then connect hose to rad valve to see if it would force the muck out, but it was literally just trickling out. Ended up back filling the flow pipework through the radiator valve from a garden tap. Disconnected the hose from the garden tap and let the water flow back out, loads of black crap came flying out. Did that a few times and it worked perfectly then.

Could be worth a try before re-piping?

Nice one!
If blockage then shifts would get plenty cleanser in system for few days before flushing out few more times.

 

[jtsplumbing]

Nice one!
If blockage then shifts would get plenty cleanser in system for few days before flushing out few more times.

Fernox F5 heavy duty cleaner, never use anything else