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pump runs but nothing circulating in system?

Boiler fires up fo 30 or so seconds, the pump runs and the system seems to be working then the boiler stops and the pump still runs and the circulation of water/central heating not workin. I have chnaged the 3 port vavle and motorised valve but still no working correctly

John
May 2009
Heating, Home Heating SystemsSystem Boiler Fires
your pump sounds like it is working , it is not ,check the vent screw to see that the pump is spinning,new pump

stew
May 2009
sounds like theres a blockage

b
May 2009

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Boiler Pump Runs But No Heating - Help!