2. No Airflow. No airflow could mean that a problem with the blower motor has resulted in the component becoming inoperable. An inoperable motor means you will have to replace it with a new one. But, the absence of airflow can also result from a bad relay or battery, a fan control problem, or a faulty thermostat.. Your blower motor is going to make some noise, that's to be expected, but at a certain point, the noise becomes too much. You notice it even after your heater has been on for a few minutes. You may also notice an abnormal sound. If you hear whirring, buzzing, or the grinding of metal, turn your blower motor off by shutting down your heater.

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Step-by-Step Testing Process. To accurately diagnose and troubleshoot a bad HVAC blower motor, the step-by-step testing process is crucial. The first step is to perform a voltage measurement. Use a probe to test the control board's 'heat' section and the L2 common neutral bar, ensuring a voltage reading of 120 volts.. Strange Rattling, Clanking, or Screeching. One of the first signs you may notice when there's an issue with the blower motor is a strange noise coming from the indoor unit or air handler. Different noises will indicate different problems. For instance, a rattling could point to loose or broken parts while a screeching could mean it's time.