If the pump is running then there can be a few problems.Check the pressure on the boiler to start and bleed the rads. make sure the lock shealds are turned on and the trvs.
does the boiler fire up then you turn the heating temp up on the boiler front if not check the diverter valve! are the pins working?? they should open and close on the CH and the DHW when turned on.
Check the pipe work for cross over or blockage from dirt or old age.
How old is the boiler as it may need changing.
good luck.
mick
mick brown
November 2008
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