Which part fails first on an air conditioner, and why does it always fail on the hottest day of the year? The majority of AC problems can be attributed to just a few things that break down more rapidly than the other components. When a customer requires a same-day repair, it’s easier to buy Air Conditioning Spare Parts Online when you know which parts are most likely to fail. Technicians call on the same parts, over and over again, during repairs, and Unified HVAC Supply carries them all. This troubleshooting guide takes you through the top common AC repair issues and the components of each, so the next time it’s a problem with your AC, you can fix it quicker.
Why Certain AC Components Fail More Than Others
During peak season, the AC units are cycling for hours on end, and certain components are under stress more than others when the AC is under stress. The repeated electrical strain on capacitors, motors, and contactors means they are subjected to strain every time the unit starts and stops. It is the same few parts that keep appearing on service calls, and it’s because of the repeated stress these parts are undergoing. If the technician is aware of this pattern, he may often know what the probable repair is without opening the unit.
Motors and Blowers: Keeping Airflow Moving
The next most frequently repaired items after capacitors are condenser fan motors and blower motors. Air not being properly circulated through the system due to a weak or seized motor can result in insufficient cooling and ultimately in compressor strain caused by overheating. When replacing HVAC motors online, it is essential to find the exact fit, including matching horsepower, voltage, and fit. This is not one that will do as a close match could burn out again within weeks. Having OEM motors from trusted manufacturers available makes the matching process easy for technicians who are dealing with a “repair window”.
Compressors: The Heart of the System
The most costly AC repair an owner will have to pay for is due to a compressor failure, which is also one of the fixes that repair technicians are hoping they don’t have to fix. It is used to circulate refrigerant around the system, and when it breaks down, the unit will have no ability to cool. Often, compressor problems manifest themselves as grinding noise, frequent tripping of the breaker, or a non-stop running system with no cooling. Since compressors are an expensive piece of equipment, it is important to get the diagnosis correct before ordering a replacement, thus saving the customer time and money.
Refrigerant Lines and Coils
If your AC runs but cools poorly, leaky refrigerant lines or a damaged evaporator coil are likely to be to blame. Common signs of these problems are icing of the coil or a gradual reduction in cooling speed over a period of days. When you buy Air Conditioning Spare Parts Online for coils or lines, it is vital to choose the correct tonnage and refrigerant type for your system. One of the deeper divisions of the Unified HVAC Supply catalog is refrigeration components, which include residential and commercial system requirements.
These are typical symptoms that can indicate coil or line problems.
- Frost on the evaporator coil
- Failing to cool gradually over a few days
- Hissing noises around the refrigerant line connections
Thermostats and Controls
But mechanical problems are not always the issue. An entire system may appear to be broken when the problem is caused by a signal from a control component that is incorrect. If it is a thermostat or control board, you may be able to replace it quicker than any of the rest of the list, as long as the replacement thermostat or control board is compatible with the system and wired the same as the current one. Unified HVAC Supply offers a wide selection of hvac controls and thermostats to help technicians find compatible components and complete repairs efficiently.
Contactors and Relays
Contactors are responsible for the electrical connection to power the compressor and outdoor fan. A pitted or stuck contactor may make the outdoor unit not start at any point, even if all the other components in the system are operating properly. This is one less expensive and smaller component than motors or compressors, but if it fails, it shuts down the entire system. Having a few common sizes on board your service trucks as AC replacement components minimizes the number of trips required to handle a simple problem.
Buying Tips for Faster, More Accurate Repairs
- Always look for a part with the model number and serial number before pulling it out.
- Make sure to refer to OEM numbers instead of general part descriptions.
- Maintain a stock of commonly required capacitors and contactors for quick replacement
- Check the voltage and sizing details before ordering
The process is significantly quicker when you buy Air Conditioning Spare Parts Online from a single organized catalog site instead of switching between different supplier sites during diagnosis.
Why choose Unified HVAC Supply to Speed Up Every Repair
The technicians who have to cross-check the catalogs for each part type mentioned in this guide waste time trying to find a single supplier. That back-and-forth is eliminated with one complete, centralized source of information for capacitors, motors, compressors, coils, and controls. Unified HVAC Supply categorizes its catalog by component type and brand so that a technician who troubleshoots a capacitor problem on one day can also access the coil problem on the same day without having to log in to different accounts. This is especially crucial in the height of summer when repairs are required in quick succession.
Follow Unified HVAC Supply on Pinterest for more HVAC tips and updates.
Frequently Asked Questions
What part of an air conditioner is the most likely to break?
Because the capacitor is the part that most often fails, it can cause a humming but not starting unit or a slow-moving fan.
Why is your air conditioner working and not cooling?
This is typically a symptom of a refrigerant leak, evaporator coil damage, or a compressor failure, and is not an electrical problem.
How to identify when the AC Capacitor needs replacement?
It can be heard as a buzzing noise at start-up, a low-speed fan, or the breaker tripping several times when attempting a start.
Can I change the AC motor myself, or should I call a technician to do an AC motor change?
When replacing the motor, you need to have the same horsepower, voltage, and mounting specifications—only a licensed technician can do this.
Where to get Original Equipment Manufacturer (OEM) parts for AC repairs?
Unified HVAC Supply offers authentic OEM parts for residential and commercial systems, including coils, controls, compressors, motors, and capacitors.
Get the Right Part Before Your Next Repair Call
Avoid wasting a day during diagnosis by cross-referencing parts from various suppliers. If a customer is in need of cooling immediately, Unified HVAC stocks the exact capacitors, motors, coils, and controls for the most common AC repairs that can be shipped nationwide. Stop by our store today and receive the correct part on the initial order.
