If this unit has a built in water filter, you will need to bypass it (with a bypass plug or by removing the water filter and trying the unit without it). If the pressure remains the same, most likely it means there is low pressure going into the unit from the wall and plumbing. If by bypassing the filter the pressure increases, it is time to replace the filter. If this does not help, the water filter head/housing will need to be replaced.
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