Unusual Noises: If your RTU starts making unfamiliar sounds like grinding, banging, or squealing, it's a clear signal that something is wrong internally. These noises often indicate issues with the belts, bearings, or motor, which require professional assessment and repair.

Inconsistent Heating or Cooling: When an RTU fails to maintain consistent temperatures or struggles to reach the set temperature, it's a sign of potential problems. This inconsistency can stem from issues like refrigerant leaks, thermostat malfunctions, or airflow obstructions.

Increased Energy Bills: A sudden rise in your energy bills, despite no change in usage patterns, can indicate that your RTU is operating inefficiently. This inefficiency could be due to a variety of issues, including dirty filters, worn components, or a failing compressor.

Poor Air Quality: If you notice a decline in indoor air quality, such as increased dust or a musty smell, it could be due to your RTU not functioning properly. This decline can result from clogged filters, dirty coils, or inadequate ventilation, all of which need professional attention.

Frequent Cycling On and Off: An RTU that frequently turns on and off, known as short cycling, is not only inefficient but also indicative of an underlying issue. Causes for short cycling can range from thermostat problems to incorrect sizing of the unit for your space.