HVAC - EPA Certification Practice Exam 2025 - Free EPA Certification Practice Questions and Study Guide

A common symptom of a malfunctioning thermostat is the presence of inconsistent temperatures throughout the space it regulates. This occurs because the thermostat may not be accurately sensing the ambient temperature or may not be properly communicating with the HVAC system to adjust heating or cooling operations as needed. When a thermostat fails to perform effectively, it can lead to wide fluctuations in temperature, resulting in discomfort for occupants and inefficient system operation.

Inconsistent temperatures suggest that the thermostat is either not calibrated correctly, is not properly located (e.g., in direct sunlight or away from airflow), or has internal mechanical or electronic issues. Addressing this problem typically involves troubleshooting the thermostat or considering its replacement to restore proper temperature regulation.

Other symptoms like increased airflow, continuous running of the system, or no air circulation could be related to a variety of other HVAC issues, including problems with the ductwork, blower motor, or compressor, rather than pointing directly to a thermostat malfunction.