A critical feature of the ECO3 is the built in function called automatic override. This safety feature causes the ECO3 to take itself out of the circuit automatically until system conditions return to normal.
This can happen if there is a maintenance issue affecting the operation of the compressor, or if there is an unusually high demand for cooling (like in a heat wave or if a refrigerator door is left open) that requires the compressor to run non-stop.
In this kind of situation, the ECO3 will put itself in automatic override, essentially turning itself off rather than continue trying to save energy. This guarantees that temperature performance will not be compromised by the ECO3.