Chemical below 32°F(0°C) at startup. Recirculate cold chemical back to drum in cold conditions before spraying.
Ensure ambient temperature is above 20°F(-7°C) .
Turn on the manual valve switch (MV), on the load center, and see if the valve shifts. If not replace solenoid.
Red, blue, and green LEDs should light up on load center board. If not, replace load center.