What to do if a fixed red "8" appears on the GYS NOMAD POWER PRO 12XL Controller screen with an alarm?
- BBrianna JonesAug 4, 2025
If a fixed red "8" appears on the LCD screen of your GYS Controller, when the clamps are connected, and an alarm sounds, it indicates a polarity reversal. To resolve this, check the battery polarity, ensuring the red clamp is connected to the positive battery terminal (+) and the black clamp to the negative (-).