Single pipe loop CH system

[Will1962]

Hi. Just bought a house, built in the 50's. Renovating it. Took two rads off in the lounge/dining room, for plastering work. Moved a radiator in a bedroom to an adjacent wall. Noticed that both ends of the radiator connected to the same pipe. Reconnecting the same way. Obviously drained the system for all this. Turned the water back on, but no heat at all. The valliant boiler has a blinking light ( pressure??) I've bled all the connected radiators, twice. Still no heat, not even in the pipes. I did notice a water tank in the loft. Assumed it was disused as the house has a boiler.
Any advice....anyone.

 

[ShaunCorbs]

Time for a repipe / new ch system

 

[snowhead]

Has the boiler fired up since you've bled the rads?
What's the pressure reading on the boiler and or system?

 

[Pickwickpick]

Ideally you need to get it repiped, if that's not an option financially at the moment then your best bet is to get an engineer out who has some experience working on one-pipe systems as they are not the easiest to get running properly.

How did you refil the system back up after you'd done the work? Is the tank in the loft a small header tank? And if so does it have water in it?

 

[Will1962]

Has the boiler fired up since you've bled the rads?
What's the pressure reading on the boiler and or system?

Hi thanks,
Yes I've fired up the boiler. It's a valliant. The pressure is gauge has no marks other than 0 but my guess is its ok (the needle is halfway around the gauge). It's now showing a fault (F64). Yesterday it was just showing a flashing light (ive googled these and found the flash was a pressure problem, and f64 could be pressure or a faulty thermostat or thermistor(??).
Anyway, the boiler fires up, but no heat or hot water.

 

[Pickwickpick]

You need a gas safe registered engineer to come out and fix that fault as it involves opening up the boiler case.