5 Common PTAC Unit Problems and How to Fix Them

Packaged Terminal Air Conditioners (PTACs)
offer numerous advantages. They don’t require ductwork, making them cheaper and easier to install than conventional ducted AC systems. Additionally, PTACs emit less noise than window AC units while providing both cooling and heating functions in one standalone package.

However, like all appliances, PTAC units can experience malfunctions from time to time. In this guide, we discuss the five most common problems PTACs encounter, how to diagnose them, and effective solutions to fix them.

1. Water Leaks

One of the most common issues PTAC owners face is water leakage inside the room. When the unit is not properly maintained or used regularly,
moisture can accumulate
inside, leading to condensation and eventually, water leaks.

It’s critical to resolve water leaks promptly as they can cause extensive long-term damage to walls, floors, and carpeting. Additionally, water leaks can lead to health issues due to mold formation and pose electrical safety risks if water affects other household appliances.

Signs:

Water dripping from the unit

Causes:

• PTAC is not used for long periods of time
• Irregular cleaning or improper maintenance
• Improper installation

Solutions:

• ✔ Run the PTAC regularly. This is important for hospitality accommodations where the room may not be occupied for extended periods.
• ✔ In extremely cold areas, use a
  dehumidifier
  to minimize moisture buildup.
• ✔ Have the PTAC serviced annually to ensure proper operation and prevent condensation formation.
• ✔ Ensure the unit is installed with a slight outside tilt to maintain proper drainage.

2. PTAC Struggling to Work

If you experience air that isn’t cold or hot enough, the PTAC may be struggling. This is usually caused by a clogged air filter or debris blocking the grills, disrupting airflow.

Signs:

• Air is not cool or hot enough
• Abnormal noises during operation

Causes:

• Dirty air filter
• Blockage of air intakes and vents caused by dirt, other appliances, or common household debris like pet dander

Solutions:

• ✔ Clean the air filter regularly. The more the PTAC is used, the more frequently the air filter should be cleaned.
• ✔ Ensure the unit is not blocked by household items, dropped objects, furniture, or other appliances.
• ✔ Check whether the outside is obstructed by foliage or environmental debris.

3. Ice Formation

PTACs with cooling and heating capabilities can be susceptible to ice formation, especially in extremely cold climates. Any sign of ice is concerning as it can cause immediate damage to the PTAC and affect its functionality.

Additionally, ice buildup can interfere with the thermostat, causing it to register inaccurate temperature readings.

Signs:

• Ice buildup on the outside of the unit

Causes:

• Damaged thermostat
• Fan issues
• Extremely cold temperatures

Solutions:

• ✔ Unplug the PTAC and call a service technician.
• ✔ Do not use the PTAC until the root cause has been identified and fixed.

4. The PTAC is Emitting Strange Sounds

Occasionally, you may hear unusual sounds coming from the PTAC during operation. The type of sound can help indicate the underlying problem.

Humming: Can be due to a broken fan blade.

Wheezing: The unit is struggling due to dirty filters or clogged intakes.

Vibrations: Loose or broken mounting brackets.

Crackling: Electrical short.

Solutions:

• ✔ Unplug the unit and inspect the exterior for loose mounting.
• ✔ Check the fan for damage or missing blades.
• ✔ Ensure the air filters are clean and the intakes are not obstructed.
• ✔ If the sound persists, discontinue using the PTAC and call for a service visit.

5. The PTAC Won’t Turn On / Shuts Off

If the PTAC stops operating, it may indicate a serious issue with the unit. Some PTACs are designed with safeguards to prevent operation in case of a malfunction.

Possible Causes:

• Tripped fuse
• Water damage inside the unit
• Damage to wiring or electronic components

Solutions:

• ✔ Clean the vents. A blocked or clogged vent prevents heat distribution and can cause the circuit breaker to trip.
• ✔ Check the interior for water or ice formation.
• ✔ If the unit still doesn’t turn on, unplug the PTAC and call an HVAC technician.

At Total Home Supply, our
huge selection of PTAC units
come from top brands and are backed by industry-leading warranties. We also offer expert advice from our extensive experience in the HVAC industry to help you resolve any PTAC issues.

Browse our related articles on PTAC troubleshooting:

• How to Replace a PTAC Unit
• How to Do a Manual Reset on an Amana PTAC Unit
• Amana PTAC Maintenance & Cleaning: A Reference Guide