Air Conditioning Repair Certification (ETI) Practice Exam 2025 - Free Air Conditioning Repair Practice Questions and Study Guide

When the moisture oil indicator shows signs of contamination, it is crucial to address the issue effectively to prevent damage to the refrigeration system. The correct action in this scenario is to replace the filter drier immediately.

The filter drier plays a vital role in the air conditioning system by removing moisture and contaminants from the refrigerant. If contamination is detected, it indicates that moisture has entered the system and potentially combined with compressor oil, which can lead to acid formation and system corrosion. By replacing the filter drier, you ensure that any moisture and contaminants currently in the system are removed, safeguarding the overall integrity and functionality of the air conditioning system.

Taking prompt action to replace the filter drier not only helps maintain the system's efficiency but also prevents further issues that could arise from continued operation with contaminated refrigerant.