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still no luck with the HW. I have tried everything and have checked all the wiring but still no joy. Is there any way to bypass the tank thermostat so that the HW is always on when the timer is selected ? I could then control the HW by the timing selection, since I only need it first thing and...

I believe that it is a gravity fed system, but if so how does the hot water reach the tank upstairs in the airing cupboard without a pump as convection alone will not cause sufficient heat to heat an entire tank of hot water. I was wondering if there was a seperate fuse in the back boiler...

It doesn't do a thing !

Baxi Bermuda Back Boiler. Programmer moved after wall demolished but now no hot water (radiators get hot). Wiring and programmer checked and OK, but boiler does not fire up when HW selected. Any ideas ?