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HVAC Troubleshooting

Follow our interactive troubleshooting guide to find answers to your system’s problems. Choose from a selection of common HVAC issues or pick your product for help with fixes you can try yourself.

Air Conditioner Troubleshooting

Many parts work together to help your air conditioner function properly, and if something goes wrong with one, it could impact the entire system. If you are experiencing an issue with your Trane system, our guide can help answer your questions. Check out these common troubles and possible solutions.

Why isn’t my air conditioner blowing cold air?

  • Your outdoor cooling coil may be clogged or blocked
    Debris can easily stick to the inlet side of the cooling coil in your unit. Be sure to clear away any tall grass, sticks, or leaves that may be surrounding your outdoor unit.
  • Your indoor air handler coil could be blocked
    Ordinary house dust and debris like soot or pollen can block indoor air handler coils. For your indoor air handler, try to wipe away any buildup of dust on the coil and change the air filter often.
  • Your filters may be clogged or dirty
    Clean or replace the filters. Consult your local Trane Comfort Specialist™ if you are unsure where the filters are located.
  • Your thermostat controls may be set incorrectly
    Try turning the thermostat off and then on again. Reset to the desired temperature and see if that helps.

Why is there no air movement or air blowing from my air conditioner?

The air handler might not be working because of a blown fuse or open circuit breaker. Reset the circuit breaker or replace the burned-out fuse. You should also check return grills for blockages that could keep air from circulating freely in the system.

Why is my air conditioner constantly running?

Your air conditioner might be constantly running because your thermostat is set too high. Reset your thermostat by turning it on and off, then adjust the temperature to a comfortable level.

Why is the drain pan for my air conditioner overflowing?

The drain pan below your interior AC unit collects condensation. An electric pump is supposed to move this condensation to a nearby drainage pipe. The pump might have come unplugged or there may be kinks or blocks in the drainage line. Contact your local Trane Comfort Specialist™ if you need help.

Why does my air conditioner smell?

A number of factors could be causing a bad smell to come from your air conditioner. While some smells — like a musty scent the first time you turn your AC on for the season — are nothing to be worried about, other odors can be dangerous. Your air conditioner could be releasing a burning smell due to an electrical issue, or smell moldy because of bacteria growth inside. If you smell anything unpleasant coming from your air conditioner, turn off your system and contact an HVAC professional immediately for help.

What can help prevent AC issues from happening?

Unfortunately, sometimes air conditioner malfunction isn’t preventable, despite all efforts. But, you can still take action to help mitigate problems and prevent them from occurring as frequently. Regular AC maintenance, done by both you and a professional, will help prevent AC issues. Plus, investing in a high-quality system with a good SEER rating, and more, will also lessen the chances of frequent issues occurring in your system.

Explore our air conditioners

Is your HVAC system still experiencing issues?

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Maintenance Tips

A healthy HVAC system can last longer and save money. Maintain your system with these tips.

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Dealers can answer questions, help you find the right products for your home, and repair your system.

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