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A low voltage usually causes this to the unit. Either your thermostat is set too low, or there may be a problem with the service panel (circuit breaker). The transformer provides power to everything in the house and could be tripping (shutting off) due to a faulty internal component.

*Note: Some of these symptoms can also indicate that your capacitor is bad.  It’s best to reach a professional for precise findings.

Poor airflow throughout the ductwork of your home will cause this issue. Try turning up your thermostat so that you have more airflow throughout the vents of your home. If there isn’t enough airflow, you may need to have your ductwork looked at by a professional.

This could also mean that you need an all-around maintenance service on your system from the inside out. Ask a professional for more information.

This is a definite red flag. Shut down your unit immediately, and don’t continue to use it until the problem has been diagnosed. Many different things could cause this, but most likely, you need a professional who can run quick tests to determine what causes the strange smell and what needs to be done to fix the problem.