Weird Central Heating problem - help please

[antman]

I have recently had radiators moved in my system and now the bolier is not functioning properly. When I switch the CH or HW on it fires up for about three minutes and then cuts out. You then have to leave it an hour or so before it fires up again. Any ideas please. The boiler was serviced by BG a couple of months ago and given a clean bill of health.
Cheers

 

[breezer]

I am not a plumber or heating engineer But i would say you have an airlock, have you tried bleeding the radiators (system should be off)

also does the boiler indicate anything? ie low pressure or have you not got a combi?

 

[antman]

I have done, there is no air in the radiators or out the bleed pipes. I'm not sure what a combi is but the boiler works my CH and HW.
Cheers

 

[masona]

Combi is a pressurized system where you don't have a water cylinder,which then don't need a cold water storage tank or F & E tank.