Why Is My AC Making a Clicking Sound?
Efficient and correctly installed AC units are meant to operate without strange noises. Any clicking sound coming from the systems can be a huge red flag. Besides annoying the residents, these kinds of noises can also be a cause for concern. The severity of the issue depends on the source of the clicking. Here are the most common problems:
Failing motor or relay switch
If the AC clicks only at startups and shutdowns, it usually indicates a malfunctioning motor, fan, or switch controlling the compressor. Regardless of the source, it needs to be inspected as soon as possible to prevent the problem from escalating.
Faulty fan blade
Repetitive clicking happens when an AC fan blade is blocked, broken, or bent. It typically requires a blade replacement or a minor fix. But if the problem has gone on for a while, the damage might be more significant. The rest of the system is likely under immense strain and will require extensive repairs.
Malfunctioning controls
If the AC produces a loud click as you turn it on, the controls may be the culprit. More specifically, the thermostat, control board, or capacitor might be malfunctioning. If the clicking persists until the AC is manually shut down with the thermostat, the controls should be fine, but other parts of the system are likely refusing to do their job.
For instance, if the clicking is accompanied by rumbling, water leaks, or freezing, the AC might be on its last legs. Hire a trained professional to confirm this and recommend a suitable replacement.
Damaged control panel
As the AC ages, so does the control panel. Over time, it can produce faulty electrical signals that generate clicking sounds and small sparks. These signals also cause the switch to turn on and off repeatedly, preventing the appliance from delivering optimal comfort. If you notice any sparks, shut down the AC immediately and reach out to a trusted HVAC company. Turn the system back on only when it’s safe to avoid fire hazards or electrocution.
Broken contactor
The contactor is located in the outdoor unit and acts as a mediator between the compressor and the thermostat. Once the thermostat sends the cooling command, the contactor activates the compressor. However, if the contactor has gone bad, it can’t execute the command and start the AC. Instead, it only emits a clicking sound.
Difficulties with the outdoor unit
The clicking sound may also come from the external AC component known as the condenser unit. It often occurs hand-in-hand with loud vibrations, indicating it can’t transfer heat properly. There are several potential causes of this issue, including loose bolts and debris build-up. In addition, the source may lie in the refrigerant line, especially if there’s a gurgling or wet sound.
When in doubt, contact a licensed HVAC contractor to evaluate your system and recommend needed repairs.
Fix My Air DFW of Fort Worth specializes in residential and commercial HVAC services including routine maintenance, installation, and repair. All makes/models. Call us at (817) 439-9811.
