if the pump comes on for HW its not a gravity hot water system.
does the fuse blow straight away when you select HW?
sounds to me like something is pulling loads of current when it starts up.
there must be a short circuit somewhere, or something is breaking down somewhere in the circuit. can you photograph the wiring centre inside and post it?
does the fuse blow straight away when you select HW?
sounds to me like something is pulling loads of current when it starts up.
there must be a short circuit somewhere, or something is breaking down somewhere in the circuit. can you photograph the wiring centre inside and post it?