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ive been looking for leaks for the last hour and there arnt any :P

WOOOOOOHOOOOOOO! i now have hot water, isnt it amazing how much we take it for granted. i appreciate the comment about being sold a part which may have been unnecessary but four days without tends to make you believe what someone says, however he was right and the problem is solved. thank you...

thanks fellas, im just refilling now so watch this space :)

ok, anyone who is reading, after speaking to a worcester bosch technician he assured me that i need to replace the DHW heat exchanger as the problem is caused by DHW overheat and the situation im experiencing is a failsafe. this makes sense so we have now purchased a new one. he said it is...

could there be an air lock in the DHW heat exchanger? if so how do i get it out?

it just occurred to me the pressure guage is right on the border of green and red, almost 3 bar, is that significant?

oh, but no hot water at all now, not even for that initial period

i did that and the boiler fired and the blue light flashes quickly five times, then pauses then does it again etc

yes the flow gets hot, no flashing light and unfortunately its no longer in warranty :( however it might be my imagination but the hot water seemed to stay hot for longer

i was thinking maybe the DHW temperature sensor??? could that have failed? Rog

wow, thanks for the quick reply, yes the pump is working, Rog

HELP :( .....hello everybody, i have a WB GREENSTAR 24i JUNIOR, the CH is working but the DHW comes on and fires for about 30 seconds and then goes cold. i have looked at the diverter valve and that operates as it should i.e. when CH is demanded the valve goes down and when i turn on the hot tap...