v3 to v4 atu conversion

with the updated pic fitted the atu can now be programmed for two types of sensor – infrared or capacitive, to change from one to the other simply

unplug at controller, press and hold button, power up whilst holding button and wait 5 seconds then release button

you can tell if you have it set for the wrong sensor if the atu works in reverse, ie topping up when water level high instead of low as it should be (if this happens simply repeat the hold button/power up sequence)

you will now need to set up the sensor for your aquarium