Good afternoon I have a Whirlpool 420 no frost refrigerator and the alarm sounds and flashing panel lights and from what I see it has no defrost sensor works a couple of days and the problem begins

Hi, you have to have it, look at this forum post. regards https://yoreparo.com/refrigeracion/refrigeradores/preguntas/1412110/heladera-whirlpool-3-frios-nofrost-420