The numbers should always be able to go up or down. In order to enter the set mode the buttons on the G2 Control Panel must be held for 3 seconds. It will then enter set mode until no additional adjustments are made to ionization setting. If the numbers will not raise or lower, and you are holding the button down for 3 seconds, then replace the control panel (item #95017). If the numbers will raise, but go back down again, make sure there is sufficient flow going across the probe. Check the probe for excessive scale build-up or debris. Scale build-up can be caused by insufficient water flow. The scale build-up will decrease the amount of ions being released into the water affecting the ability to raise or lower the panel. Check the probe for build-up and brush or scrape the bars. If you notice this happening frequently, try moving the probe to a location with higher water flow. Water chemistry will also play a role in this. Make sure your alkalinity is at 100-250ppm. Adding a small amount of salt can help raise the conductivity in the water allowing the control panel to raise higher, BUT this will also “super-charge” the probe causing it to exhaust quicker. The conductivity can be easily raised by adding Aquascape's Pond Salt per the dosing recommendations on the bottle.
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