Common Problems with PTAC Units and How to Fix Them

Packaged terminal air conditioners (PTAC) are quiet, efficient, and easy to install, making them a popular heating and cooling solution in a range of commercial and industrial applications. As with any type of air conditioning unit, proper maintenance is essential. Many of the most common problems with PTAC units can be avoided or corrected with regular cleaning and service.

What is a PTAC Unit?

Industrial and commercial PTACs are ductless, self-contained units. They're mounted through the wall and used to heat and cool small spaces. This makes them ideal for hotels, hospitals, apartments, office buildings, and other facilities that require individual temperature control solutions in each room.

Common Problems with PTAC Units

High-quality, well-maintained PTAC units from the industry's leading manufacturers are designed for reliability and durability. Even so, you will run into issues from time to time, as you would with any HVAC solution. These are some of the most common problems with PTAC units:

1. Lack of Cooling or Heating

If the unit isn't providing warm or cool air, it could be due to:

• Faulty thermostat
• Refrigerant leak
• Dirty filters

2. Unusual Noises

If you notice any rattling, buzzing, or clicking, something is probably wrong. Maybe it's not impacting the function of the AC today, but if you ignore it, it could lead to bigger and more expensive problems in the future. The type of noise you hear can help you identify the problem—for example, a wheezy noise could mean the filters are clogged, while a crackling sound may indicate an electrical problem. Unusual noises can be caused by:

• Loose parts
• Broken fans
• Debris lodged in the unit
• Faulty or damaged wiring

3. Water Leaks

It's often easy to identify a leak: you can see water dripping from the unit. Even if the AC seems to be working properly, leaks require immediate attention because they can cause water damage to your walls and floors, water damage to the unit itself, and electrical safety issues. The water also creates a moist, humid environment that encourages mold growth, which can lead to strange odors as well as health risks. Common causes of leaks include:

• Clogged drain lines
• Condensation issues
• Improper installation

4. Unit Not Turning On

This is a problem you can't ignore for long! There are many potential reasons the unit is not turning on. Some can be solved by checking your circuit breakers, cleaning the filter, or calling the power company, while others will require an HVAC repair professional:

• Power supply issues
• Faulty wiring
• Tripped circuit breakers
• Poor airflow
• Blocked air filters
• Obstructed vents
• Fan motor problems
• Internal water damage

5. Strange Odors

Odors create an unpleasant experience for your employees, customers, or guests and they may pose a health risk, especially for people with asthma or allergies. Without attention, the problem will only get worse. Check immediately for:

• Growth of mold and mildew
• Dirty filters and coils
• Pest infestations

How to Fix Common PTAC Unit Problems

The best fix is prevention. You can greatly reduce your risk of bad odors, leaks, broken parts, and other problems by regularly inspecting and cleaning your PTAC units. Take a look at these troubleshooting tips for the most common PTAC problems:

Cleaning and Replacing Filters

Each unit has its own recommended maintenance frequency; how often you have to clean or replace the filters will also depend upon your air quality and how often the unit is used. In general, check filters once per month and clean or replace as necessary. This will improve the air quality in the room, improve energy efficiency, and prolong the lifespan of your AC unit.

Checking and Refilling Refrigerant

As long as there are no leaks, you shouldn't have to refill the refrigerant—which is why regular inspections are important. Your maintenance professional can check for leaks and refrigerant levels during each routine service visit. If you're consistently having to refill the refrigerant because of a leak that can't be found or fixed, it may be time to replace the unit.

Addressing Noise Issues

Strange sounds can be caused by loose components and debris. Clean the fan and filter, remove debris, and check for loose or broken brackets. As the air conditioner ages, it may get noisier as it struggles to operate efficiently. After several years, excessive noise may be a reason to consider replacing the unit.

Resolving Water Leaks

This may be as simple as clearing a clogged drain line. If the water can't flow where it's supposed to, it will look for another way out. You might also need to check for holes and cracks.

Troubleshooting Power Issues

If the unit won't turn on, reset your circuit breakers and make sure there is power to the outlet. Check for debris, as a clogged vent could prevent the unit from working properly and trip the breaker. From there, all power cords, wiring, and connectors will need to be examined. Check for water damage or ice formation inside the unit.

Improving Airflow

Service the fan motor to ensure it's functioning properly. Clean the filters and vents to make sure there's no dirt or debris obstructing the flow of air.

Eliminating Odors

Prevent and eliminate odors by cleaning the coils and filters. You can also use a dehumidifier to discourage the growth of mold and mildew. Take immediate action on any pest problems no matter where they are in your facility, as they could eventually make their way to the AC unit.

Shop Commercial PTAC Units from NorthStock

To avoid some of the most common problems with PTAC units, you should start with well-engineered heating and cooling solutions that are built to last, backed by warranty, and trusted in applications across the USA. NorthStock is a leading HVAC distributor with a wide selection of industrial and commercial PTAC units at competitive prices. We offer fast, free shipping to the lower 48 states. Contact us today.

PTAC FAQs

When do I know if it's time for a new PTAC unit?

In general, PTAC units will last 10-15 years. However, the lifespan could be shortened by poor maintenance or excessive or improper use. Signs you might need a new one include:

• Higher than normal utility bills
• Excessive noise with a cause that can't be identified or corrected
• Air is not as warm or as cool as it should be
• There's a refrigerant leak that can't be found or fixed

How often should I service my PTAC unit?

Filters should be checked and cleaned every three months at a minimum. Full service and inspection is typically required once or twice per year. Follow the recommendations on your unit's user manual and fix problems as quickly as possible.

What are the signs of a failing PTAC unit?

Some signs of a failing PTAC unit are excessive noise, inefficient operation, leaks, if the unit won't turn on or off, or if the unit won't provide warm or cool air.

How do I improve the efficiency of my PTAC unit?

Some ways to improve the efficiency of a PTAC unit are:

• Purchase a PTAC unit with a high EER and SEER rating
• Make sure your air conditioner is the right size for the room
• Properly install the PTAC
• Use your heater and air conditioner as directed
• Perform regular inspections and service visits
• Fix broken components promptly
• Keep the filters and other components clean and obstruction-free