Preheat the air fryer to 400°F.
Slice the potato into thin wedges and toss with 1 tsp of avocado oil and a pinch of sea salt.
Place the potato wedges in the air fryer basket and cook for 15-18 minutes until tender and browned.
In a shallow bowl, whisk together the whole wheat flour, garlic powder, paprika, black pepper, and light beer until a smooth, thick batter forms.
Pat the cod fillet dry with a paper towel and season lightly with sea salt.
Dip the cod into the batter, ensuring it is fully and evenly coated.
Lightly grease the air fryer basket with the remaining 1 tsp of avocado oil.
Place the battered fish in the air fryer and cook at 375°F for 10-12 minutes, flipping carefully halfway through, until the exterior is crunchy and the fish flakes easily.
Serve the hot fish and chips immediately with a fresh lemon wedge.