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Combi conversion nightmare

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Scott_D

Scott_D

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can anyone help before I start ripping up floor boards

Converting to a combi but I can’t get the heating to circulate to the rads
New boiler in the same place as old so piped up to the flow and return dropping from the ceiling

I removed the cylinder and piped the flow from the boiler to the flow out to the rads
I capped the cylinder return and stuck an air vent on but it wont circulate

I linked the primary flow and return in the airing cupboard and it circulated back to the boiler
It’s as though the rads are not connected to the return
 
You sure the main return is linked to the rads return now?

Could of been gravity hot water before

I would link the cylinder ret to boiler ret

Was the old sys working ?
 
I have only got 3 pipes in the airing cupboard
Flow and return from the boiler
Flow to the rads

The house isn’t old enough to be gravity

It seems like the rad return isn’t teed into the primary return
 
the main return has to be connected to the rads return else it would of never been connected

What does the boiler do ?
 
Boiler works fine if I link the primary’s in the airing cupboard

The heat doesn’t go anywhere when I remove the link
 
scott_d said:
from left to right
Cold
Hot
Primary flow
Primary return
Rads flow
Click to expand...

thought the primary return wasnt in the airing cupboard?
 
Defiantly got a primary flow and return
When I link them it circulates around the boiler

And what was flow to the rad from the old 3 port
Those are my three pipes I’m left with once everything was removed
 
Ideal independant
Cheap landlord job that was supposed to be easy

The boiler works fine when I link the primary’s in the airing cupboard
 
Have you got the new flow going up the old flow?

A lot of people struggle with y and s plans so if they messed it up they may have put a non return valve in which if you have the flow and return the opposite way round won't work.
 
scott_d said:
I removed the cylinder and piped the flow from the boiler to the flow out to the rads
I capped the cylinder return and stuck an air vent on but it wont circulate
Click to expand...
It might be a numb question so excuse me (haven't seen it) but there's no high point to air lock in the connection from primary flow to CH flow to rads is there?
 
Last Plumber said:
It might be a numb question so excuse me (haven't seen it) but there's no high point to air lock in the connection from primary flow to CH flow to rads is there?
Click to expand...
I put a vent in the airing cupboard
The only thing I can think of is the tenants went round with a spanner and shut off all the rads
 
1C58C60F-F042-4D3B-8B40-EB64C4EC7352.jpeg

I left it like this in the airing cupboard
Then linked the primary flow and return on the stumps for vents and the heating circulates to to the airing cupboard and back to the boiler
The rads dont heat
 
Return not linked?
 

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