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Unlikely the pump would blow the fuse even if it was stalled, and the valve shouldn't either, since it exists in the stalled state most of the time. Possibly a wire has come loose and fallen where it shouldn't or some water has got in where it shouldn't be! Have you got a multi meter? Can you access where the pump and valve were connected, you might be able to disconnect them one at a time to see if that stops the fuse blowing. Assuming this is a system with an external pump, then the boiler won't run for long without tripping on overheat if the pump is not running, but it could prove a point.
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Central Heating Timer Blowing Fuse new
Central Heating Timer Blowing Fuse new