The copper strip on the back of the cartridge is very sensitive to static discharge, and can also be disrupted by the oil from skin, or residual water. Take a moment to gently brush this strip owith a piece of paper towel, then reinstall it.
The copper strip on the back of the cartridge is very sensitive to static discharge, and can also be disrupted by the oil from skin, or residual water. Take a moment to gently brush this strip owith a piece of paper towel, then reinstall it.