Red Seal Appliance Service Technician Practice Exam

What does the presence of frost build-up in a freezer typically indicate?

1. A broken compressor

2. A possible door seal issue

3. An overloaded circuit

4. A refrigerant leak

The correct answer is: A possible door seal issue

The presence of frost build-up in a freezer typically indicates a possible door seal issue. When the door seal is compromised, warm moist air can enter the freezer. This moisture then freezes, leading to frost accumulation. A well-functioning door seal is critical for maintaining the interior temperature of the freezer and preventing external air from getting in. If the seal is damaged, dirty, or misaligned, it can result in insufficient sealing, causing frost to form. In contrast, a broken compressor would likely manifest as the freezer not cooling at all, rather than causing specific frost build-up. An overloaded circuit may lead to various electrical problems but does not directly correlate to frost formation. A refrigerant leak would typically result in inconsistent cooling throughout the appliance, leading to poor performance rather than localized frost accumulation.