DIY Doctor UK DIY Forums

Hi I recently moved into a townhouse with 3 floors. I have a Santon premier plus unvented system. I recently removed 2 radiators to paint behind them, unfortunately I am having trouble getting all radiators to heat up now after bleeding. Is there a certain method to bleed this type of system?? How does this system actually work??

Any help would keep my freezing girlfriend off my back

Thanks