This is a ventless dryer category product designed for homes where exterior venting is difficult, such as condos, interior laundry closets, or retrofit installations. Ventless systems rely on more sensors and moisture handling, so problems often involve condensate pumps, sensors, airflow fans, and electronics; in heat-pump designs, compressor-related repairs can be expensive.
Repair is usually worthwhile for sensor or pump issues, especially earlier in life, because replacement is a larger spend and installation constraints may limit alternatives. Replacement becomes more attractive if the heat-pump/compressor fails out of warranty or if drying times remain very long even after cleaning filters, coils, and airflow paths-poor performance can drive higher energy use and frustration.
Also consider the household's tolerance for longer cycles: if ventless drying no longer fits lifestyle needs, replacement could be an opportunity to change the setup where possible.