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Central heating not working downstairs?

My central heating radiators are hot upstairs and cold downstairs, except the kitchen rad which is next to the boiler. I've bled all the air out of the radiators - there wasn't much - and checked that the pump impeller is turning under power. The pump is a Grundfos 15-50, about 8 years old I think.

John Whiteoak
January 2009
GrundfosGrundfos 15-50Heating, Home Heating SystemsCentral Heating Boiler Grundfos
Turn of the valves controlling the rads which are working one by one & keep checking if the heat begins to circulate. It sound possible that you have a build up of sludge & may need to have your system flushed.

Tez
January 2009
Are you sure the pump is running and not just buzzing as it sounds like the problem is the pump.Hold a large screwdriver to the head of the pump and put your ear to the end of the driver.You should be able to hear if it is running or just buzzing.

Tony S
January 2009

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Grundfos 15-50 Pump Issues - Central Heating