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What Are the Most Common Types of HVAC Repair?

What Are the Most Common Types of HVAC Repair?

As an experienced AC and heating company, we provide many common types of HVAC repair. An issue may be unfamiliar to you when something goes wrong. However, the NATE-certified technicians at Waldrop Plumbing — Heating — Air see some HVAC problems quite often. Therefore, they immediately know how to assess them and find permanent solutions. And when providing HVAC maintenance services, they can look for common problems to address before they worsen.

The most common types of HVAC repair we’re called out for include:

Clogged Air Filters

Changing air filters doesn’t require a technician. However, many people forget to maintain their HVAC filters. A clogged filter restricts airflow and can cause dust and dirt to enter the system. The increased strain can accelerate wear and tear, decrease efficiency, and lead to major repairs. Before the system breaks down, it may start to work ineffectively, so a technician may first check the filter and change it if necessary.

Faulty Thermostat

A thermostat may send incorrect signals to an HVAC unit if its batteries are low, its wiring is damaged, or it needs to be calibrated. Try replacing the battery before calling an AC contractor. However, if you can’t determine the source of the issue, call for help so a technician can find the underlying problem. They can recalibrate, repair, or replace the thermostat to get your HVAC unit to work again.

Blown Fuses

An HVAC system’s fuse is usually on its control board. Like a standard fuse, it will blow if too much power is running through the system. Depending on the fuse, it can be unscrewed or unclipped. We recommend hiring a professional because of the risk of damage and injury. Also, a blown fuse can indicate a power or overheating issue, so the technician will check the electrical connections, motors, and compressor to see if other HVAC repairs are needed.


An HVAC leak can take different forms. The most common leaks in a heating or cooling system include:

  • Refrigerant Leaks: Damage to a condenser coil, evaporator coil, or refrigerant line can result in a leak that can only be repaired by a professional. Some leaks can be sealed, while others require replacing the damaged coil.
  • Condensate Drain Leaks: A broken drain pan or condensate line can cause a water leak. The leakage can lead to mold growth, floods, or water damage to HVAC components or building materials.
  • Duct Leaks: If an air duct has a hole, crack, tear, or loose connection, air leakage can reduce comfort and system efficiency. Some leaks can be sealed from the inside, but others require more extensive ductwork repairs or replacement.

Dirty Coils

Condenser and evaporator coils can become coated with dirt and debris. If so, the coils must be physically cleaned. Otherwise, they’ll become less effective at heat transfer, forcing the unit to work harder. Call a professional for a coil cleaning to avoid damage, prevent HVAC repairs, and ensure the job is as thorough as possible.

Damaged Blower Motor

If the blower motor isn’t working properly, your AC or heating system won’t be able to distribute air properly. Call for help if the blower motor stops running or runs but your home doesn’t reach the right temperature. If it runs continuously and the thermostat is set correctly, there could be a bad fan relay or safety switch. An experienced contractor knows what issues to look for, how to find them, and the best solutions to each problem.

Bad Contactor

Contactors are among the many electrical components in your HVAC system. They’re found in the compressor, blower motor, and condenser fan motor. A malfunctioning contactor will prevent electrical current from passing through, so the system can’t start. Fortunately, bad contactors are easy for a skilled professional to replace.

Pilot/Ignition Problems

A furnace has numerous ignition components that may require repairs. If a pilot, flame sensor, or burner becomes dirty or starts to deteriorate, a heater may stop working, short cycle, or have a delayed ignition. An issue with the gas supply, such as a leak, can also be the cause. Such problems can put your safety at risk, so call a trained technician right away.

Worn Parts

Mechanical wear is a common reason for HVAC repair. Fans, belts, bearings, and other moving parts are durable, but constant motion causes wear and tear that can result in poor heating/cooling performance, overheating, or airflow problems. During regular maintenance, moving parts should be checked for wear and lubricated. But if there are signs of trouble, they should be replaced to avoid more damage.

Contact Waldrop Plumbing — Heating — Air Today

At Waldrop, our NATE-certified technicians can provide any type of HVAC repair in Greenville or Spartanburg County. We also recommend regular HVAC maintenance that includes an inspection and tune-up. Routine service lets us perform minor repairs, clean the system, and lubricate moving parts. Our team is committed to ensuring your AC and heating systems are reliable and efficient. To schedule service, contact us online or call (864) 536-0887.

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Greenville, SC

Five stars

Waldrop has taken care of our HVAC since our house was built (2006). We get maintenance twice a year – spring and fall. This year, Kevin suggested the Phenomenal Aire unit. It cleans the air

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Marietta, SC

Five stars

Had the best experience with Waldrop, we will forever be in their debt. Not only the most professional group of men but the most honest, stand by your word company! I would recommend Waldrop to

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Five stars

A friend recommended Waldrop after he had a visit last week. Our A/C was not cooling as well as it should, and the Split “Smart” thermostat was doing crazy things on the first and 2nd


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