Air Conditioning Repair Certification (ETI) Practice Exam

Question: 1 / 400

What signs indicate that the air conditioning system may require a charge of refrigerant?

Insufficient cooling and frost on the evaporator

The signs that indicate an air conditioning system may require a charge of refrigerant often include insufficient cooling performance combined with the presence of frost on the evaporator coil. When the refrigerant level is low, the system struggles to absorb heat effectively, resulting in inadequate cooling within the space. Additionally, as the refrigerant drops below the required amount, it can cause the evaporator coil to become excessively cold, leading to frost build-up on the coil itself. This frost is a clear indication that the system is not functioning properly and may be a sign that it is low on refrigerant, as it typically should operate without frost accumulation.

Understanding this symptom can help technicians diagnose the need for a refrigerant charge rather than attributing the issues to other potential problems within the system.

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Increased noise from the compressor

Changes in airflow direction

Warm air blowing from the vents

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