If you’ve got -22 showing on the display the Weepmizer is not seeing the temperature sensor or you’ve got a cut or broken wire going to the temperature sensor. Check the wiring going from the Weepmizer plug to the sensor. You should always keep power on the Weepmizer. I put a ball valve upstream of the normally open solenoid valve and a switch on the power to the solenoid valve. After the weep season I close the ball valve and turn off the power to the solenoid valve.