How to resolve the problem of a pH that is too high? (pH > 17)
Sometimes, ICO can provide an incorrect reading of the pH. It indicates that the pH is 17 or higher. This can be down to a fault in the level of contact with the circuit board of the ICO.
To resolve this follow these intructions:
Step 1 : Remove ICO from the water and dry it properly
Step 2 : Open the cover
Step 3 : Press and hold the button down. The light will flash yellow once. ICO is switched off.
Step 4 : Remove the pH sensor (blue) from its place
Step 5 : With the help of a small, fine knife, push one or two strips away from the sensor to create some separation, as shown in the picture.
Step 6 : Put the pH sensor back
Step 7 : Press and hold the button down. The light will flash green 3 times. ICO is switched on.
Step 8 : Put the cover back on
Step 9 : Put ICO back in the water
Step 10 : Keep track of the next pH values recorded