An RTU is a kind of HVAC system, which includes all the constituents needed to supply conditioned air in 1 brief unit. Rooftop units are generally found in large and light commercial applications. They are in demand with industrial and retail properties.

Normally, the RTU unit is a big metal box composed of components like an expansion device, compressor, air-cooled condenser, and evaporator. Your building’s RTU unit not only keeps the temperature consistent but also impact safety, productivity levels, and energy bills.

Rooftop units are more tough and impermeable. They are built to prevent snow, debris, rain, and even small animals from getting inside while still permitting air to go through.

Adopting a precautionary maintenance program is crucial to ensuring your rooftop unit system operates efficiently and properly. However, even a well-maintained system will need repairing every now and then.

The surest way to extend your rooftop unit’s life is by precautionary maintenance with the right service plan. Without system maintenance, RTU units lose their energy efficiency very fast.

Generally, there are a lot of problems that you need to keep an eye on. Let’s take a brief look at the top 10 occurring problems of RTU units mentioned by RTU maintenance Fort Worth.

1-Dirty Coils

In case the coil of the RTU unit is very dirty. Subsequently, it will have a tough time pulling heat out of the atmosphere. That can lead to condensation which is gathered on the coil freezing cold, and that also intensifies the problem. It develops a coating of insulation that the system must then contend with.

 Dirty coils can lead to heat-releasing problems. In that case, the refrigerant will not cool down properly, and the AC will be unable to make your home cool as efficiently or effectively as it otherwise would.

2-Thermostat Problem

The thermostat is placed close to the evaporator coils inside your HVAC unit. When a problem emerges, don’t be surprised to discover that the problem is with the thermostat. The thermostat adjusts the timing & amount of cold or hot air the RTU unit should make. That’s why when the thermostat has a malfunction, then your building or residence can suffer from irregular temperature variations, which can impact your comfort.

Referring to your RTU unit owner’s guide & considering the operating instructions will inhibit you from paying for an unnecessary or costly service call.

3-Inappropriate air balance

The cooled or heated air that comes out of your HVAC unit vents moves through a chain of ducts before reaching each room. Dampers regulate the air by lowering airflow in one line & allowing extra conditioned air to run to other lines. If your rooms don’t heat or cool faster, then it may be due to the imbalanced dampers.

4-Leaking refrigerant

The liquid components that make air-conditioning possible are the refrigerant. They are contained inside the coils of an RTU unit system, which dehumidifies & cools the indoor air.

If your RTU unit does not have sufficient refrigerant, then it cannot do its job properly & the air it produced will not be very cold. The refrigerant problem heats the air inside your residence or building and leads to the condenser’s overtime working, resulting in costly system problems.

5-Uncommon Furnace Noises

 A few furnace noises are part of the routine operation, but other noises may be an indication or warning of a technical problem. A squealing or whining motor indicates the failure of bearings in a blower motor or inducer motor.

To prevent a furnace failure, the replacement of the motor is needed. Other noises can be caused due to dirty burners or airflow issues. Therefore, it is better not to ignore these noises as they could direct to a furnace failure.

6-Tripped Breakers or Blown fuses

 Overworking of blowers can lead to trip breakers. In case anything is blocking airflow in the RTU unit system, then the blower needs to work harder to compensate. One of the most usual causes is air filter full of dirt.

Dirty air filter makes the blower work hard to enforce air via the filter. This is the case that raises the energy consumption in the blower, which sometimes trips the breaker. Some other issues that lead to blowers’ overworking include blocked-off or closed air registers or duct leaks, or dirty coils.

7-Continuous running of the blower

 Few reasons are there for why a blower might run continuously. First of all, you must check the switch of the fan on the thermostat. In case the thermostat is arranged to the fan on position, the motor runs continuously. Sometimes the tenants accidentally leave the fan switch on, which is the main reason for this problem.

A fan relay is available in the furnace, which turns on the blower if there is a requirement for heat. In case the relay is stuck, then the blower runs continuously. There are many types of limits & safeties on the furnace, but if the safety or limit doesn’t reset, then the blower will never shut off.

8-Mechanical Wearing out

 The RTU’s unit heating system counts on numerous mechanical components. The unit’s performance can be hampered by normal wearing out of these components. Belts & bearings can result in poor heating, airflow issues, or overheating. Regular maintenance of these types of problems should include keeping an eye for stretched or worn out belts & oiling bearings as well as motors if needed.

9-Water leakage 

 Every RTU unit produces condensate. For drainage purposes, proper drain pipes are used. If the drainage lines are either cracked or clogged, then the furnace causes water to leak. Regular cleaning by using bleach can help prevent water leakage.

Other likely sources of a leak could be the heat exchanger, evaporator drain tank, or collector box.

10-Ignition or Pilot Problems

 Ignition or pilot problems can happen due to numerous causes. A flame sensor, burner, or dirty pilot can lead to an outage of the pilot, delayed ignition, short cycling, or the burners’ furnace lockout. Sometimes, it could also happen because of a gas supply problem or just wearing out of an ignition constituent that needs to be changed like the hot surface thermocouple or ignite.


By understanding where a mechanical problem might occur in your RTU unit, you can take vibrant measures to make sure it is in good working condition & dodge major issues before they happen. Being precautionary about your HVAC system’s needs can increase efficiency, control needless energy consumption & expense, and keep you happy as well as comfortable.

It is best to have RTU unit problems handled by a skilled & qualified service technician because this work deals with hazardous elements like high voltage & natural gas. Here at RTU maintenance Fort Worth,we provide you with all types of RTU unit maintenance as well as skillful technicians for your service. To know more, contact us at (214) 550-3458, or you can text us at

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