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Hi - thanks for confirming that manual operation of the immersion heater does not make the A10 trip. Along the lines of #20 can you confirm it never trips with the immersion controller switched off? Perhaps it is seeing an overload when trying to balance sending power to the battery or the grid and immersion controller winding the load up and down in accord with its own programme (?). As you say, if immersion is left on 100%, the system does not trip.