Hello,
Apologies if there's a topic that covers this, I've read through a large number of posts but I'm stuck.
A replaced a radiator with on my microbore heating system with a new one of the same size, and now I can't get the thing to heat up, here's what I've tried;
There are no TRV's involved
Removed / Checked / Cleaned the two valves
Confirmed that there's water flowing to each of pipes, so no blockage in feed or return pipe
I can bleed the rad, at which point it gets warm, but then get's cold as soon as I shut the bleed valve
Found that the pump (Grundfos 18/60) was not doing anything on position 1 & 2, and stuggling on 3 (althought the other rads were heating up) so replaced it with a 15/60 which is happily heating all other rads
It's a new radiator so there shouldn't be any sludge in it
I've turned off all the other radiators and this one still doesn't get hot
The radiator closest to this (this is upstairs at the end of the loop) - which splits off from the feed / return to this radiator and is downstairs - gets hot no problem
I can access the two microbore pipes under the floor that feed the radiator, there are no obvious kinks or other damage
What could it be? - is it simply an air lock, if so how do I get rid of it and why's that downstairs radiator getting hot?
Any suggestions appreciated.
Thanks
John
Apologies if there's a topic that covers this, I've read through a large number of posts but I'm stuck.
A replaced a radiator with on my microbore heating system with a new one of the same size, and now I can't get the thing to heat up, here's what I've tried;
There are no TRV's involved
Removed / Checked / Cleaned the two valves
Confirmed that there's water flowing to each of pipes, so no blockage in feed or return pipe
I can bleed the rad, at which point it gets warm, but then get's cold as soon as I shut the bleed valve
Found that the pump (Grundfos 18/60) was not doing anything on position 1 & 2, and stuggling on 3 (althought the other rads were heating up) so replaced it with a 15/60 which is happily heating all other rads
It's a new radiator so there shouldn't be any sludge in it
I've turned off all the other radiators and this one still doesn't get hot
The radiator closest to this (this is upstairs at the end of the loop) - which splits off from the feed / return to this radiator and is downstairs - gets hot no problem
I can access the two microbore pipes under the floor that feed the radiator, there are no obvious kinks or other damage
What could it be? - is it simply an air lock, if so how do I get rid of it and why's that downstairs radiator getting hot?
Any suggestions appreciated.
Thanks
John