Preheat your air fryer to 400°F to ensure a hot cooking environment.
Slice the russet potato into thin, even wedges and toss them in a bowl with the olive oil, sea salt, and black pepper.
Arrange the potato wedges in a single layer in the air fryer basket and cook for 15 minutes, shaking the basket halfway through.
While the potatoes cook, whisk together the all-purpose flour, cold light beer, garlic powder, and paprika in a shallow dish until a smooth batter forms.
Pat the cod fillet completely dry with paper towels, then dip it into the batter to ensure it is fully and evenly coated.
Carefully place the battered fish into the air fryer basket next to the potatoes and spray lightly with a touch of oil if desired.
Air-fry the fish and chips together for an additional 10 to 12 minutes until the fish is opaque and the batter is golden brown and crisp.