Old Single Pipe heating system problem

[Graham SW]

I have recently had to cap 3 radiators in a single pipe system and since then the system has stopped working. The boiler works and the pump seems to turn on but water doesnt seem to circulate. I thought maybe capping the radiators had broken the system loop but dont think this is the case anymore. Anyother ideas? This is only temporary while other work is being done before a change the system but some heat would be nice right now

 

[Last Plumber]

I have recently had to cap 3 radiators in a single pipe system and since then the system has stopped working. The boiler works and the pump seems to turn on but water doesnt seem to circulate. I thought maybe capping the radiators had broken the system loop but dont think this is the case anymore. Anyother ideas? This is only temporary while other work is being done before a change the system but some heat would be nice right now

Capping rads won't stop the system working. Maybe it is air locked?

 

[Best]

It shouldn’t stop working unless the one pipe system was literally routed through each radiator to the next.
Or you have an airlock caused when you drained system?

 

[SimonG]

Check the header tank. The other rads full?

 

[Graham SW]

Check the header tank. The other rads full?

There's 1 radiator I can't get the drain/vent to open so its probably full of air any ideas how to get rid of the air if a can't open the valve?
Thanks

 

[SimonG]

Drill and retap a new one.

Shouldn't stop it running.

Get hose onto drain off and back fill with mains cold. Just don't go crazy and make sure overflow on header tank all secure to outside.

 

[SimonG]

Bled the pump?

 

[Graham SW]

Drill and retap a new one.

Shouldn't stop it running.

Get hose onto drain off and back fill with mains cold. Just don't go crazy and make sure overflow on header tank all secure to outside.

Thanks I'll give it go tomorrow

 

[townfanjon]

Thanks I'll give it go tomorrow

Did you drain the full system?

 

[Graham SW]

Did you drain the full system?

Yes