Adjustment Menu:
While Holding Button 1 and 3 on Display, Turn Key ON, then Press Buttons 3 - 1 - 2 - 3 within 10 seconds
The display will now show the Adjustment Menu, you can key through using the Up/Down arrows and enter each setting using Button 5

Diagnostic Menu:
While Holding Button 1 and 4 on Display, Turn Key ON, then Press Buttons 2 - 3 - 4 - 1 within 10 seconds
The display will now show the Diagnostic Menu, you can key through using the Up/Down arrows and enter each menu using Button 5