No flow in radiators

[bandejapaisa]

My central heating has been turned off for a few weeks as I'm replacing radiators. The boiler is brand new and was working fine before. Hot water has been working fine.

I've reconnected new radiators, the boiler appears to have pressure.... although I don't know why as this usually diminishes to zero when I drain the central heating.

There is no water flow in the system. Any ideas what I need to do to get water flowing again? I've turned the heating up fully and the boiler is boiling.... just no flow.

I've got a Vaillant eco tech plus 837.

Thanks

 

[bandejapaisa]

I read the manual (yes i should have done this first)

There are service valves under the boiler on the flow and return that were close.... Doh !!