What does a temperature differential across a filter-drier typically indicate?

A temperature differential across a filter-drier is indicative of a restricted filter-drier. When the filter-drier is functioning normally, refrigerant flows through it with minimal resistance, resulting in a relatively small temperature difference between the inlet and outlet. However, if there is a significant temperature differential, it suggests that the filter-drier is becoming clogged or restricted, which impedes the flow of refrigerant. This could lead to issues such as reduced efficiency, overheating components, or even system failure if not addressed. Recognizing this temperature differential is an important diagnostic skill for HVAC technicians, as it points to a specific problem that requires maintenance or replacement of the filter-drier to ensure the system operates effectively.