3 Common Electrical Issues With Mini-Split AC Systems


Mini-split AC systems offer many advantages, especially for homeowners with older houses or condos. Since mini-split units don't require any ductwork installation, they make an excellent fit for structures where retrofitting may not be feasible or cost-effective. These systems are also typically reliable, but that doesn't mean that they never fail.

If you aren't familiar with the operation of mini-split systems, then you may not immediately recognize when something is wrong. Below you will find three electrical issues that sometimes arise with this style of air conditioner and the most likely causes for each.

1. Control Board Failures

The control board is the "brain" of your mini-split system. You can find this component in the outdoor condenser unit, where it controls the operation of the compressor. When a control board fails, it can lead to many symptoms. You may notice your air conditioner cooling poorly or, in some cases, failing to turn on at all.

Diagnosing a control board failure isn't something that you should attempt on your own. Control boards are expensive components and not ones you should replace without being sure that you've found the problem. A technician can both confirm that the board is the problem and investigate any underlying failures that may have fried the board in the first place.

2. Cabling Issues

Mini-split systems use a cable with four wires to connect the indoor and outdoor units. Two of these wires supply power, while the third and fourth act as communications and grounding wires. Problems with any of these wires can cause your system to malfunction, and may even cause damage to other components. Mini-split installers use armored cable, but damage can still sometimes occur.

Problems with the grounding wire can be particularly troublesome. A bad ground can damage your control board or other electronic components, and result in odd, seemingly random symptoms. Control wire problems can also impact the system's ability to function correctly. If you suspect a wiring problem, an HVAC technician can check the condition of your system's main cable.

3. Control or Display Problems

Mini-split units typically contain an integrated thermostat, with controls on the unit itself. Some air conditioners may also include a remote for convenience. Problems with the controls on the device can often result in similar symptoms to a failing thermostat for traditional home AC systems. You may have trouble setting the desired temperature or the unit may fail to adequately cool to the set point.

In these cases, a technician will attempt to determine whether the underlying issue is the temperature sensor or the electronic control board. Both parts are typically replaceable on most units, so you should generally be able to repair the problem without replacing the entire indoor unit.

For more information, contact an air conditioning repair service in your area today.


18 August 2020

Shopping For A New HVAC System

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