Preheat your air fryer to 400°F (200°C).
Slice the russet potato into 1/2-inch thick wedges and toss them in a bowl with the olive oil, half of the sea salt, and all of the paprika.
Place the potato wedges in the air fryer basket in a single layer and cook for 15-18 minutes, shaking the basket halfway through, until they are golden and tender.
While the potatoes cook, pat the cod fillet completely dry with paper towels and season both sides with the remaining sea salt, black pepper, and garlic powder.
In a small shallow bowl, whisk the flour and light beer together until a thick, smooth paste forms.
Place the panko breadcrumbs in a second shallow bowl.
Dip the seasoned cod fillet into the beer paste to coat it thoroughly, then press it into the panko breadcrumbs until the fish is completely crusted.
Carefully place the crusted fish in the air fryer basket next to the potatoes (or cook separately if space is limited) and air fry at 375°F (190°C) for 10-12 minutes until the crust is crunchy and the fish flakes easily with a fork.
Serve the fish and chips immediately with a fresh lemon wedge for a bright, citrusy finish.