I have just sold a house where there is a Combi Boiler. The radiators have been on snow control for approx one year now as there have been no occupants in the house. The question is, how do I make sure that the central heating will now continue to operate as when the new owners put the system on and it starts running, they then turn it off and errors show on the boiler. Could it be that the system needs to run for a while to kick in. I am going up to the house tonight and was thinking of turning all the radiators on to full pressure, turning up the temperature gauge and hopefully it will work, but if it is turned off again, will the same thing happen? Jan