All pipework replaced - still little to no heating downstairs

[newcastle phill]

Well if its a 2 pipe system i fail to see how it can be just returning without providing any heat to rads.
As I asked earlier...Is part an old 1 pipe system.
Sounds like the flow to upstairs is coming back into the flow somewhere else and not the return lol

 

[Tonycane]

I had an install with a similar problem, was 22mm speedfit on the first floor, the first 22mm speedfit tee off the flow blocked. Found the speedfit pipe insert had come loose and completely blocked the flow causing the same issues you have. I cut the flow and return and put a speed fit loop in connected to one rad to prove the boiler was doing good it's job and then passed it back to the installer. Just something to consider.

 

[knightime]

lol - you're probably right with the flow thing Tony! What I can't understand is why it worked for one day (the day the original plumbers left), but why the next day it failed!

I also don't understand how the flow and return pipes that I can see on the boiler are both hot, but in the bathroom only the flow is hot, while the return is cold!!!

It could have been that waaay back it was a 1 pipe system - the plumbers removed a lot of redundant pipework - but the 2 pipes above the boiler have been there since we moved in - 16 years now - so I'm assuming it's a 2 pipe system. All seems very strange to me...:ack2:

 

[knightime]

Thanks again for that Tony - I'll certainly pass on your experience to the plumber before he turns up tomorrow!

 

[Tonycane]

Flow and return being hot is the heat building up in the boiler and creeping up the return abit because it has nowhere to go.

 

[knightime]

Ahhhh, so it's possible for the flow to affect the return directly on the boiler side i.e both pipes hot, if the flow has nowhere to go?

 

[Tonycane]

Normally overheats first but it will get warm. I bet the boiler modulates down then goes off because it's sensing the return temprature

 

[knightime]

That's the thing Tony - it doesn't - and it doesn't make any noise/shut off/show error codes - it just chugs away like everything's fine! And that return pipe directly connected is as hot as the flow pipe, but that doesn't reflect on the flow/return upstairs. Sorry to keep repeating myself but it's proper confusing me at the mo lol!

 

[Tonycane]

Jesus, if I was local I would pop in just to see this ball ache!

 

[knightime]

Lmao - wish you were too buddy!!!