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worcester 240 no hot water?

I have hot water when heating is on but not if its off.Had the diaphram changed in the diverter valve and the plunger comes out and contacts the micro switches. the demand light comes on but boiler won't fire up any ideas ?
Andy Stockport, April 2009
When the pin makes the microswitch, does the pump come on?

andy gas man, April 2009
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