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domestic hot water works but the heating shuts down?

.hello i have a halstead ace boiler, the hot water works fine but the heating shuts down after a few mins....there is then a green flashing light,on the heating...the pump turns freely when i unscrew the screw at the front, i've tried tapping the pump with a hammer to free any silt....is there a separate fuse for the pump??...i've just bought the house & its been empty for about a year....any ideas??
tricklevent, May 2011
could be the divertor valve on the boiler have it checked for correct operation

paul, May 2011
link Click here to see other fixes for Halstead Ace.