There’s nothing worse than finding yourself with a broken HVAC system in the middle of summer. When all you want to do is be cool, and your HVAC stops working or isn’t operating at max capacity, it can be tough not to panic. Mini-split systems offer efficient heating and cooling solutions for homes and businesses. Unfortunately, like any machinery, mini-split system issues arise from time to time. Understanding common problems and the basics for troubleshooting mini-split systems can help you maintain the optimal performance of your unit, prolong its lifespan, and know what to do when trouble arises.
The Problem: Ice Formation on Coils
If your mini-split system is blowing out air but not heating your home, perform ductless air conditioner troubleshooting by checking the system’s coils to see if ice has built up on them. When the coils freeze, they’re unable to effectively draw heat out of the surrounding air, and your system won’t work properly.
The Solution
To remove ice buildup from the coils of your mini-split system, start by turning off the unit and disconnecting it from the power source. Then, allow the ice to melt or gently remove it. Wipe down the coils with a dry cloth. Make sure you’ve removed all the moisture from the system before reconnecting it to its power source.
Once you’ve removed the ice, it’s time to address the root cause of your mini-split problems. One of the main reasons why ice forms on the coils of a mini-split system is because the coils have become dirty and simply need a proper cleaning. Another common cause of ice formation is an insufficient refrigerant level. Most mini-split systems are prefilled with refrigerant; however, you may need to add additional refrigerant in some cases.
The Problem: The System Won’t Power On
Another problem a ductless AC and heat system can experience is an inability to turn on. This issue may occur for one of many potential reasons. If your mini-split system won’t power on, consider trying out the following solutions.
The Solution
One possible reason why you may have mini-split issues is due to operational error. Before deeming the system a lost cause, double-check that you have it set to “hot” or “cool” and that it is set to “on.” This solution may seem obvious, but many reported mini-split issues are simply the result of using incorrect settings. If the settings on your system are correct and your mini-split still won’t turn on, check your home’s power. If other appliances in your home also aren’t working, there’s a good chance the problem lies with your home’s power supply, and you don’t have mini-split problems.
The Ductless Mini-Split is Too Noisy
Ductless mini-split systems might produce a slight sound while running, but the noise produced is often inaudible. Therefore, when you notice loud and abnormal sounds coming from the ductless system, consider troubleshooting for an underlying issue. Some common abnormal sounds might include rattling, banging, thumping, humming or squealing.
The Solution
Some underlying issues that might cause these noises are a loose cabinet, bent fan blades or trapped debris that causes unwanted friction among components. To fix the issue, contact your local service technician to tighten the loose parts.
The Problem: Communication Issues
In order for a mini-split system to function properly, proper communication is essential. If your system is experiencing communication issues such as poor signal, inconsistent operation, miscommunication between the remote and the system, or unresponsiveness to commands, one of the most common causes is improper wiring.
The Solution
A potential way to fix this common problem with a ductless mini-split is to check your mini-split’s user manual and local electrical codes to ensure you’re using the correct communication wire. Most mini-splits require either an 18-gauge wire or a 14-gauge 4-conductor wire for proper operation. The wire should also be stranded rather than solid and rated for both indoor and outdoor use. If you’re unsure if you’re using the correct wire, consult a professional electrician to help solve your mini-split issues. In addition, it’s also a good idea to inspect the system’s electrical terminals and tighten any loose connections if needed.